Search

Your search keyword '"Mežnaršič, Tadej"' showing total 22 results
Start Over Author "Mežnaršič, Tadej"
22 results on '"Mežnaršič, Tadej"'

1. Suppression of dark-state polariton collapses in cold-atom quantum memory

Author

Gosar, Katja, Jevšenak, Vesna Pirc, Mežnaršič, Tadej, Beguš, Samo, Krehlik, Tomasz, Ponikvar, Dušan, Zupanič, Erik, and Jeglič, Peter

Subjects
Quantum Physics, Physics - Atomic Physics, Physics - Optics
Abstract

We observe dark-state polariton collapses and revivals in a quantum memory based on electromagnetically induced transparency on a cloud of cold cesium atoms in a magnetic field. Using $\sigma^+$ polarized signal and control beams in the direction of the magnetic field, we suppress the dark-state polariton collapses by polarizing the atoms towards one of the stretched Zeeman states and optimizing the frequency detuning of the control beam. In this way, we demonstrate a quantum memory with only partial dark-state polariton collapses, making the memory usable at any storage time, not only at discretized times of revivals. We obtain storage time of more than 400 $\rm{\mu}$s, which is ten times longer than what we can achieve by trying to annul the magnetic field., Comment: 6 pages, 4 figures, improved version

Published
2023
Full Text
View/download PDF

3. Incommensurable matter-wave jets in quasi-1D geometry

Author

Mežnaršič, Tadej, Žitko, Rok, Gosar, Katja, Pirman, Jure, Arh, Katja, Jug, Matevž, Zupanič, Erik, and Jeglič, Peter

Subjects
Condensed Matter - Quantum Gases, Nonlinear Sciences - Pattern Formation and Solitons, Physics - Atomic Physics, Quantum Physics
Abstract

Matter-wave jets are ejected from a Bose-Einstein condensate subjected to a modulation of the interaction strength. For sufficiently strong modulation additional higher harmonic matter-wave jets emerge. Here we report the first experimental observation of incommensurable "golden" $\frac{1+\sqrt{5}}{2}$ matter-wave jets in a Bose-Einstein condensate exposed to a single frequency interaction modulation. We study the formation of higher-order jets and the corresponding incommensurable density waves in quasi-one-dimensional geometry with numerical one dimensional (1D) Gross-Pitaevskii equation simulation. We explore the process of jet formation experimentally and theoretically for a wide range of modulation amplitudes and frequencies and establish a phase diagram delineating different regimes of jet formation., Comment: 7 pages, 3 figures, improved version

Published
2023

4. Preparation of ultra-cold atomic-ensemble arrays using time-multiplexed optical tweezers

Author

Gosar, Katja, Jevšenak, Vesna Pirc, Mežnaršič, Tadej, Babič, Dušan, Poberaj, Igor, Zupanič, Erik, and Jeglič, Peter

Subjects
Physics - Atomic Physics, Condensed Matter - Quantum Gases, Quantum Physics
Abstract

We use optical tweezers based on time-multiplexed acousto-optic deflectors to trap ultra-cold cesium atoms in one-dimensional arrays of atomic ensembles. For temperatures between 2.5 $\mu$K and 50 nK we study the maximal time between optical tweezer pulses that retains the number of atoms in a single trap. This time provides an estimate on the maximal number of sites in an array of time-multiplexed optical tweezers. We demonstrate evaporative cooling of atoms in arrays of up to 25 optical tweezer traps and the preparation of atoms in a box potential. Additionally, we demonstrate three different protocols for the preparation of atomic-ensemble arrays by transfer from an expanding ultra-cold atomic cloud. These result in the preparation of arrays of up to 74 atomic ensembles consisting of $\sim$100 atoms on average., Comment: 8 pages, 5 figures, accepted for publication in Phys. Rev. A

Published
2022
Full Text
View/download PDF

5. Cold Atoms in Space: Community Workshop Summary and Proposed Road-Map

Author

Alonso, Ivan, Alpigiani, Cristiano, Altschul, Brett, Araujo, Henrique, Arduini, Gianluigi, Arlt, Jan, Badurina, Leonardo, Balaz, Antun, Bandarupally, Satvika, Barone, Barry C Barish Michele, Barsanti, Michele, Bass, Steven, Bassi, Angelo, Battelier, Baptiste, Baynham, Charles F. A., Beaufils, Quentin, Belic, Aleksandar, Berge, Joel, Bernabeu, Jose, Bertoldi, Andrea, Bingham, Robert, Bize, Sebastien, Blas, Diego, Bongs, Kai, Bouyer, Philippe, Braitenberg, Carla, Brand, Christian, Braxmaier, Claus, Bresson, Alexandre, Buchmueller, Oliver, Budker, Dmitry, Bugalho, Luıs, Burdin, Sergey, Callegari, Luigi Cacciapuoti Simone, Calmet, Xavier, Calonico, Davide, Canuel, Benjamin, Caramete, Laurentiu-Ioan, Carraz, Olivier, Cassettari, Donatella, Chakraborty, Pratik, Chattopadhyay, Swapan, Chauhan, Upasna, Chen, Xuzong, Chen, Yu-Ao, Chiofalo, Maria Luisa, Coleman, Jonathon, Corgier, Robin, Cotter, J. P., Cruise, A. Michael, Cui, Yanou, Davies, Gavin, De Roeck, Albert, Demarteau, Marcel, Derevianko, Andrei, Di Clemente, Marco, Djordjevic, Goran S., Donadi, Sandro, Dore, Olivier, Dornan, Peter, Doser, Michael, Drougakis, Giannis, Dunningham, Jacob, Easo, Sajan, Eby, Joshua, Elertas, Gedminas, Ellis, John, Evans, David, Examilioti, Pandora, Fadeev, Pavel, Fanı, Mattia, Fassi, Farida, Fattori, Marco, Fedderke, Michael A., Felea, Daniel, Feng, Chen-Hao, Ferreras, Jorge, Flack, Robert, Flambaum, Victor V., Forsberg, Rene, Fromhold, Mark, Gaaloul, Naceur, Garraway, Barry M., Georgousi, Maria, Geraci, Andrew, Gibble, Kurt, Gibson, Valerie, Gill, Patrick, Giudice, Gian F., Goldwin, Jon, Gould, Oliver, Grachov, Oleg, Graham, Peter W., Grasso, Dario, Griffin, Paul F., Guerlin, Christine, Gundogan, Mustafa, Gupta, Ratnesh K, Haehnelt, Martin, Hanımeli, Ekim T., Hawkins, Leonie, Hees, Aurelien, Henderson, Victoria A., Herr, Waldemar, Herrmann, Sven, Hird, Thomas, Hobson, Richard, Hock, Vincent, Hogan, Jason M., Holst, Bodil, Holynski, Michael, Israelsson, Ulf, Jeglic, Peter, Jetzer, Philippe, Juzeliunas, Gediminas, Kaltenbaek, Rainer, Kamenik, Jernej F., Kehagias, Alex, Kirova, Teodora, Kiss-Toth, Marton, Koke, Sebastian, Kolkowitz, Shimon, Kornakov, Georgy, Kovachy, Tim, Krutzik, Markus, Kumar, Mukesh, Kumar, Pradeep, Lammerzahl, Claus, Landsberg, Greg, Poncin-Lafitte, Christophe Le, Leibrandt, David R., Leveque, Thomas, Lewicki, Marek, Li, Rui, Lipniacka, Anna, Liu, Christian Lisdat Mia, Lopez-Gonzalez, J. L., Loriani, Sina, Louko, Jorma, Luciano, Giuseppe Gaetano, Lundblad, Nathan, Maddox, Steve, Mahmoud, M. A., Maleknejad, Azadeh, March-Russell, John, Massonnet, Didier, McCabe, Christopher, Meister, Matthias, Meznarsic, Tadej, Micalizio, Salvatore, Migliaccio, Federica, Millington, Peter, Milosevic, Milan, Mitchell, Jeremiah, Morley, Gavin W., Muller, Jurgen, Murphy, Eamonn, Mustecaplıoglu, Ozgur E., OShea, Val, Oi, Daniel K. L., Olson, Judith, Pal, Debapriya, Papazoglou, Dimitris G., Pasatembou, Elizabeth, Paternostro, Mauro, Pawlowski, Krzysztof, Pelucchi, Emanuele, Santos, Franck Pereira dos, Peters, Achim, Pikovski, Igor, Pilaftsis, Apostolos, Pinto, Alexandra, Prevedelli, Marco, Puthiya-Veettil, Vishnupriya, Quenby, John, Rafelski, Johann, Rasel, Ernst M., Ravensbergen, Cornelis, Reguzzoni, Mirko, Richaud, Andrea, Riou, Isabelle, Rothacher, Markus, Roura, Albert, Ruschhaupt, Andreas, Sabulsky, Dylan O., Safronova, Marianna, Saltas, Ippocratis D., Salvi, Leonardo, Sameed, Muhammed, Saurabh, Pandey, Schaffer, Stefan, Schiller, Stephan, Schilling, Manuel, Schkolnik, Vladimir, Schlippert, Dennis, Schmidt, Piet O., Schnatz, Harald, Schneider, Jean, Schneider, Ulrich, Schreck, Florian, Schubert, Christian, Shayeghi, Armin, Sherrill, Nathaniel, Shipsey, Ian, Signorini, Carla, Singh, Rajeev, Singh, Yeshpal, Skordis, Constantinos, Smerzi, Augusto, Sopuerta, Carlos F., Sorrentino, Fiodor, Sphicas, Paraskevas, Stadnik, Yevgeny V., Stefanescu, Petruta, Tarallo, Marco G., Tentindo, Silvia, Tino, Guglielmo M., Tinsley, Jonathan N., Tornatore, Vincenza, Treutlein, Philipp, Trombettoni, Andrea, Tsai, Yu-Dai, Tuckey, Philip, Uchida, Melissa A, Valenzuela, Tristan, Bossche, Mathias Van Den, Vaskonen, Ville, Verma, Gunjan, Vetrano, Flavio, Vogt, Christian, von Klitzing, Wolf, Waller, Pierre, Walser, Reinhold, Williams, Eric Wille Jason, Windpassinger, Patrick, Wittrock, Ulric, Wolf, Peter, Woltmann, Marian, Worner, Lisa, Xuereb, Andre, Yahia, Mohamed, Yazgan, Efe, Yu, Nan, Zahzam, Nassim, Cruzeiro, Emmanuel Zambrini, Zhan, Mingsheng, Zou, Xinhao, Zupan, Jure, and Zupanic, Erik

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics, General Relativity and Quantum Cosmology, High Energy Physics - Experiment, High Energy Physics - Phenomenology, Physics - Atomic Physics
Abstract

We summarize the discussions at a virtual Community Workshop on Cold Atoms in Space concerning the status of cold atom technologies, the prospective scientific and societal opportunities offered by their deployment in space, and the developments needed before cold atoms could be operated in space. The cold atom technologies discussed include atomic clocks, quantum gravimeters and accelerometers, and atom interferometers. Prospective applications include metrology, geodesy and measurement of terrestrial mass change due to, e.g., climate change, and fundamental science experiments such as tests of the equivalence principle, searches for dark matter, measurements of gravitational waves and tests of quantum mechanics. We review the current status of cold atom technologies and outline the requirements for their space qualification, including the development paths and the corresponding technical milestones, and identifying possible pathfinder missions to pave the way for missions to exploit the full potential of cold atoms in space. Finally, we present a first draft of a possible road-map for achieving these goals, that we propose for discussion by the interested cold atom, Earth Observation, fundamental physics and other prospective scientific user communities, together with ESA and national space and research funding agencies., Comment: Summary of the Community Workshop on Cold Atoms in Space and corresponding Road-map: https://indico.cern.ch/event/1064855/

Published
2022
Full Text
View/download PDF

6. Single-shot Stern-Gerlach magnetic gradiometer with an expanding cloud of cold cesium atoms

Author

Gosar, Katja, Arh, Tina, Mežnaršič, Tadej, Kvasič, Ivan, Ponikvar, Dušan, Apih, Tomaž, Kaltenbaek, Rainer, Žitko, Rok, Zupanič, Erik, Beguš, Samo, and Jeglič, Peter

Subjects
Physics - Atomic Physics, Quantum Physics
Abstract

We combine the Ramsey interferometry protocol, the Stern-Gerlach detection scheme, and the use of elongated geometry of a cloud of fully polarized cold cesium atoms to measure the selected component of the magnetic field gradient along the atomic cloud in a single shot. In contrast to the standard method where the precession of two spatially separated atomic clouds is simultaneously measured to extract their phase difference, which is proportional to the magnetic field gradient, we here demonstrate a gradiometer using a single image of an expanding atomic cloud with the phase difference imprinted along the cloud. Using resonant radio-frequency pulses and Stern-Gerlach imaging, we first demonstrate nutation and Larmor precession of atomic magnetization in an applied magnetic field. Next, we let the cold atom cloud expand in one dimension and apply the protocol for measuring the magnetic field gradient. The resolution of our single-shot gradiometer is not limited by thermal motion of atoms and has an estimated absolute accuracy below $\pm0.2$~mG/cm ($\pm20$~nT/cm)., Comment: 7 pages, 5 figures

Published
2020
Full Text
View/download PDF

7. Metallic State in Rubidium-Loaded Low-Silica X zeolite

Author

Jeglič, Peter, Nakano, Takehito, Mežnaršič, Tadej, Arčon, Denis, and Igarashi, Mutsuo

Subjects
Condensed Matter - Strongly Correlated Electrons
Abstract

The ground state of alkali metals when the particle size decreases from bulk to nanometric atomic clusters is inevitably accompanied by quantum effects that can suppress their pristine metallic state. We demonstrate that the metallic nature of rubidium clusters confined and arrayed in the framework of insulating low-silica X zeolite is preserved. The $^{87}$Rb NMR spin-lattice relaxation assigned to rubidium clusters in supercages shows a Korringa behavior from 190~K down to 10~K, which is compatible with a macroscopic observation of low electrical resistivity. The density of states at the Fermi level is found to be enhanced compared to the analogous sodium case, consistent with a Holstein-Hubbard model of alkali-loaded zeolites., Comment: Extended version showing new data, 4+epsilon pages, 4 figures

Published
2019
Full Text
View/download PDF

8. Emission of correlated jets from a driven matter-wave soliton in a quasi-one-dimensional geometry

Author

Mežnaršič, Tadej, Žitko, Rok, Arh, Tina, Gosar, Katja, Zupanič, Erik, and Jeglič, Peter

Subjects
Condensed Matter - Quantum Gases, Nonlinear Sciences - Pattern Formation and Solitons, Physics - Atomic Physics
Abstract

We demonstrate the emission of correlated atom jets from a matter-wave soliton in a quasi-one-dimensional optical trap. We characterize the dependence of jet properties on the frequency, amplitude and length of the modulation, and qualitatively reproduce the trends in the mean-field picture with a one-dimensional time-dependent Gross-Pitaevskii equation simulation. High-order jets are observed for sufficiently long pulses. A double-pulse modulation sequence produces consecutive jets, and a multi-pulse sequence may lead to irregular 3D jets at a finite angle to the direction of the channel. In the limit of vanishing high-order jets beyond-mean-field number correlations of jet pairs are demonstrated, implying possible number squeezing., Comment: 5 pages, 4 figures, published in PRA

Published
2019
Full Text
View/download PDF

9. Cesium bright matter-wave solitons and soliton trains

Author

Mežnaršič, Tadej, Arh, Tina, Brence, Jure, Pišljar, Jaka, Gosar, Katja, Gosar, Žiga, Žitko, Rok, Zupanič, Erik, and Jeglič, Peter

Subjects
Condensed Matter - Quantum Gases, Nonlinear Sciences - Pattern Formation and Solitons, Physics - Atomic Physics
Abstract

A study of bright matter-wave solitons of a cesium Bose-Einstein condensate (BEC) is presented. Production of a single soliton is demonstrated and dependence of soliton atom number on the interatomic interaction is investigated. Formation of soliton trains in the quasi one-dimensional confinement is shown. Additionally, fragmentation of a BEC has been observed outside confinement, in free space. In the end a double BEC production setup for studying soliton collisions is described., Comment: 9 pages, 7 figures, accepted for publication in Phys. Rev. A

Published
2019
Full Text
View/download PDF

10. Thermally Activated Motion of Sodium Cations in Insulating Parent Low-Silica X Zeolite

Author

Igarashi, Mutsuo, Jeglič, Peter, Mežnaršič, Tadej, Nakano, Takehito, Nozue, Yasuo, Watanabe, Naohiro, and Arčon, Denis

Subjects
Condensed Matter - Strongly Correlated Electrons
Abstract

We report a $^{23}$Na spin-lattice relaxation rate, $T_1^{-1}$, in low-silica X zeolite. $T_1^{-1}$ follows multiple BPP-type behavior as a result of thermal motion of sodium cations in insulating material. The estimated lowest activation energy of 15~meV is much lower than 100~meV observed previously for sodium motion in heavily Na-loaded samples and is most likely attributed to short-distance jumps of sodium cations between sites within the same supercage., Comment: 2 pages, 1 figure, published in JPSJ

Published
2017
Full Text
View/download PDF

12. Cold atoms in space: community workshop summary and proposed road-map

Author

Alonso, Iván, primary, Alpigiani, Cristiano, additional, Altschul, Brett, additional, Araújo, Henrique, additional, Arduini, Gianluigi, additional, Arlt, Jan, additional, Badurina, Leonardo, additional, Balaž, Antun, additional, Bandarupally, Satvika, additional, Barish, Barry C., additional, Barone, Michele, additional, Barsanti, Michele, additional, Bass, Steven, additional, Bassi, Angelo, additional, Battelier, Baptiste, additional, Baynham, Charles F. A., additional, Beaufils, Quentin, additional, Belić, Aleksandar, additional, Bergé, Joel, additional, Bernabeu, Jose, additional, Bertoldi, Andrea, additional, Bingham, Robert, additional, Bize, Sébastien, additional, Blas, Diego, additional, Bongs, Kai, additional, Bouyer, Philippe, additional, Braitenberg, Carla, additional, Brand, Christian, additional, Braxmaier, Claus, additional, Bresson, Alexandre, additional, Buchmueller, Oliver, additional, Budker, Dmitry, additional, Bugalho, Luís, additional, Burdin, Sergey, additional, Cacciapuoti, Luigi, additional, Callegari, Simone, additional, Calmet, Xavier, additional, Calonico, Davide, additional, Canuel, Benjamin, additional, Caramete, Laurentiu-Ioan, additional, Carraz, Olivier, additional, Cassettari, Donatella, additional, Chakraborty, Pratik, additional, Chattopadhyay, Swapan, additional, Chauhan, Upasna, additional, Chen, Xuzong, additional, Chen, Yu-Ao, additional, Chiofalo, Maria Luisa, additional, Coleman, Jonathon, additional, Corgier, Robin, additional, Cotter, J. P., additional, Michael Cruise, A., additional, Cui, Yanou, additional, Davies, Gavin, additional, De Roeck, Albert, additional, Demarteau, Marcel, additional, Derevianko, Andrei, additional, Di Clemente, Marco, additional, Djordjevic, Goran S., additional, Donadi, Sandro, additional, Doré, Olivier, additional, Dornan, Peter, additional, Doser, Michael, additional, Drougakis, Giannis, additional, Dunningham, Jacob, additional, Easo, Sajan, additional, Eby, Joshua, additional, Elertas, Gedminas, additional, Ellis, John, additional, Evans, David, additional, Examilioti, Pandora, additional, Fadeev, Pavel, additional, Fanì, Mattia, additional, Fassi, Farida, additional, Fattori, Marco, additional, Fedderke, Michael A., additional, Felea, Daniel, additional, Feng, Chen-Hao, additional, Ferreras, Jorge, additional, Flack, Robert, additional, Flambaum, Victor V., additional, Forsberg, René, additional, Fromhold, Mark, additional, Gaaloul, Naceur, additional, Garraway, Barry M., additional, Georgousi, Maria, additional, Geraci, Andrew, additional, Gibble, Kurt, additional, Gibson, Valerie, additional, Gill, Patrick, additional, Giudice, Gian F., additional, Goldwin, Jon, additional, Gould, Oliver, additional, Grachov, Oleg, additional, Graham, Peter W., additional, Grasso, Dario, additional, Griffin, Paul F., additional, Guerlin, Christine, additional, Gündoğan, Mustafa, additional, Gupta, Ratnesh K., additional, Haehnelt, Martin, additional, Hanımeli, Ekim T., additional, Hawkins, Leonie, additional, Hees, Aurélien, additional, Henderson, Victoria A., additional, Herr, Waldemar, additional, Herrmann, Sven, additional, Hird, Thomas, additional, Hobson, Richard, additional, Hock, Vincent, additional, Hogan, Jason M., additional, Holst, Bodil, additional, Holynski, Michael, additional, Israelsson, Ulf, additional, Jeglič, Peter, additional, Jetzer, Philippe, additional, Juzeliūnas, Gediminas, additional, Kaltenbaek, Rainer, additional, Kamenik, Jernej F., additional, Kehagias, Alex, additional, Kirova, Teodora, additional, Kiss-Toth, Marton, additional, Koke, Sebastian, additional, Kolkowitz, Shimon, additional, Kornakov, Georgy, additional, Kovachy, Tim, additional, Krutzik, Markus, additional, Kumar, Mukesh, additional, Kumar, Pradeep, additional, Lämmerzahl, Claus, additional, Landsberg, Greg, additional, Le Poncin-Lafitte, Christophe, additional, Leibrandt, David R., additional, Lévèque, Thomas, additional, Lewicki, Marek, additional, Li, Rui, additional, Lipniacka, Anna, additional, Lisdat, Christian, additional, Liu, Mia, additional, Lopez-Gonzalez, J. L., additional, Loriani, Sina, additional, Louko, Jorma, additional, Luciano, Giuseppe Gaetano, additional, Lundblad, Nathan, additional, Maddox, Steve, additional, Mahmoud, M. A., additional, Maleknejad, Azadeh, additional, March-Russell, John, additional, Massonnet, Didier, additional, McCabe, Christopher, additional, Meister, Matthias, additional, Mežnaršič, Tadej, additional, Micalizio, Salvatore, additional, Migliaccio, Federica, additional, Millington, Peter, additional, Milosevic, Milan, additional, Mitchell, Jeremiah, additional, Morley, Gavin W., additional, Müller, Jürgen, additional, Murphy, Eamonn, additional, Müstecaplıoğlu, Özgür E., additional, O’Shea, Val, additional, Oi, Daniel K. L., additional, Olson, Judith, additional, Pal, Debapriya, additional, Papazoglou, Dimitris G., additional, Pasatembou, Elizabeth, additional, Paternostro, Mauro, additional, Pawlowski, Krzysztof, additional, Pelucchi, Emanuele, additional, Pereira dos Santos, Franck, additional, Peters, Achim, additional, Pikovski, Igor, additional, Pilaftsis, Apostolos, additional, Pinto, Alexandra, additional, Prevedelli, Marco, additional, Puthiya-Veettil, Vishnupriya, additional, Quenby, John, additional, Rafelski, Johann, additional, Rasel, Ernst M., additional, Ravensbergen, Cornelis, additional, Reguzzoni, Mirko, additional, Richaud, Andrea, additional, Riou, Isabelle, additional, Rothacher, Markus, additional, Roura, Albert, additional, Ruschhaupt, Andreas, additional, Sabulsky, Dylan O., additional, Safronova, Marianna, additional, Saltas, Ippocratis D., additional, Salvi, Leonardo, additional, Sameed, Muhammed, additional, Saurabh, Pandey, additional, Schäffer, Stefan, additional, Schiller, Stephan, additional, Schilling, Manuel, additional, Schkolnik, Vladimir, additional, Schlippert, Dennis, additional, Schmidt, Piet O., additional, Schnatz, Harald, additional, Schneider, Jean, additional, Schneider, Ulrich, additional, Schreck, Florian, additional, Schubert, Christian, additional, Shayeghi, Armin, additional, Sherrill, Nathaniel, additional, Shipsey, Ian, additional, Signorini, Carla, additional, Singh, Rajeev, additional, Singh, Yeshpal, additional, Skordis, Constantinos, additional, Smerzi, Augusto, additional, Sopuerta, Carlos F., additional, Sorrentino, Fiodor, additional, Sphicas, Paraskevas, additional, Stadnik, Yevgeny V., additional, Stefanescu, Petruta, additional, Tarallo, Marco G., additional, Tentindo, Silvia, additional, Tino, Guglielmo M., additional, Tinsley, Jonathan N., additional, Tornatore, Vincenza, additional, Treutlein, Philipp, additional, Trombettoni, Andrea, additional, Tsai, Yu-Dai, additional, Tuckey, Philip, additional, Uchida, Melissa A., additional, Valenzuela, Tristan, additional, Van Den Bossche, Mathias, additional, Vaskonen, Ville, additional, Verma, Gunjan, additional, Vetrano, Flavio, additional, Vogt, Christian, additional, von Klitzing, Wolf, additional, Waller, Pierre, additional, Walser, Reinhold, additional, Wille, Eric, additional, Williams, Jason, additional, Windpassinger, Patrick, additional, Wittrock, Ulrich, additional, Wolf, Peter, additional, Woltmann, Marian, additional, Wörner, Lisa, additional, Xuereb, André, additional, Yahia, Mohamed, additional, Yazgan, Efe, additional, Yu, Nan, additional, Zahzam, Nassim, additional, Zambrini Cruzeiro, Emmanuel, additional, Zhan, Mingsheng, additional, Zou, Xinhao, additional, Zupan, Jure, additional, and Zupanič, Erik, additional

Published
2022
Full Text
View/download PDF

14. Cesium Bose-Einstein condensates in confined geometries

Author

Mežnaršič, Tadej and Jeglič, Peter

Subjects
Bose-Einstein condensate, enačba Grossa in Pitaevskega, Bose fireworks, Bosejevi ognjemeti, matter-wave jets, soliton train, sub-Poissonian correlations, solitonski vlak, subpoissonske korelacije, Bose-Einsteinov kondenzat, soliton, Gross-Pitaevskii equation
Abstract

I present the first cold atom setup in Slovenia capable of producing a Bose-Einstein condenstate (BEC) of cesium. This thesis describes the experimental apparatus, the path to the BEC and two experiments in a quasi-one-dimensional trapping geometry. In the first experiment we investigated the formation of solitary matter-waves (solitons), which maintain their shape indefinitely inside the confining channel potential. This is the first experimental realization of solitons with cesium atoms. In addition to single solitons, soliton trains are formed inside the potential and train like structures outside the confining channel. Along with experiments the theory of solitons in the framework of Gross-Pitaevskii equation (GPE) is presented. In the second experiment we used the solitons as a source of matter-wave jets, which form when the condensate is subjected to periodic modulation of interatomic interaction. The jets are characterized with respect to the modulation amplitude and frequency as well as its duration. Conditions for the formation of jets in different velocity modes are explored with numerical simulations of GPE, resulting in a phase diagram for jet formation. The relatively rare incommensurate jets are confirmed experimentally. Finally, we show that jet number correlations are sub-Poissonian, indicating the possibility of quantum entanglement between the jets. Predstavljam prvi eksperiment s hladnimi atomi v Sloveniji. Opisujem eksperimentalno napravo, našo pot do Bose-Einsteinovega kondenzata cezija ter dva eksperimenta v kvazienodimenzionalni pasti. V prvem eksperimentu smo raziskali proces nastanka snovnega solitona, valovnega paketa, ki v potencialnem kanalu svojo obliko ohranja v nedogled. S tem smo kot prvi dokazali obstoj solitona s cezijevimi atomi. Poleg posameznih solitonov v kanalu lahko pride tudi do nastanka solitonskih vlakov, kjer so solitoni nanizani v vrsto. Temu podoben niz valovnih paketov pa nam je iz podolgovatega oblaka nepričakovano uspelo ustvariti tudi v odsotnosti potenciala. Predstavim tudi teorijo solitonov v okviru enačbe Grossa in Pitaevskega (GPE). V drugem eksperimentu solitone uporabimo kot začetno stanje za nastanek Bosejevih ognjemetov, izstrelitve paketov snovnih valov, ki so posledica periodične modulacije interakcije med atomi znotraj kondenzata. Ognjemete karakteriziramo v odvisnosti od frekvence, amplitude in dolžine modulacijskega pulza. Uspelo nam je opaziti tudi redke "zlate" ognjemete, katerih hitrost ni preprosto povezana z vzbujevalno frekvenco. Bolj podrobno pogoje za nastanek različnih hitrostnih komponent ognjemetov preučimo z uporabo numeričnih simulacij GPE, s pomočjo katerih sestavimo fazni diagram. Na koncu pokažemo še, da je število v paru nasprotnih ognjemetov subpoissonsko korelirano, kar nakazuje možnost kvante prepletenosti med izstreljenimi paketi atomov.

Published
2022

19. Cesium bright matter-wave solitons and soliton trains

Author

Mežnaršič, Tadej, primary, Arh, Tina, additional, Brence, Jure, additional, Pišljar, Jaka, additional, Gosar, Katja, additional, Gosar, Žiga, additional, Žitko, Rok, additional, Zupanič, Erik, additional, and Jeglič, Peter, additional

Published
2019
Full Text
View/download PDF

20. Lasersko hlajenje cezijevih atomov

Author

Mežnaršič, Tadej and Žitko, Rok

Subjects
laser cooling, cezij, Bose-Einstein condensate, hladni atomi, lasersko hlajenje, cesium, udc:536.933, statistical physics, evaporative cooling, statistična fizika, evaporacijsko hlajenje, ultracold atoms, Bose-Einsteinova kondenzacija
Published
2017

22. Thermally Activated Motion of Sodium Cations in Insulating Parent Low-Silica X Zeolite.

Author

Mutsuo Igarashi, Jeglič, Peter, Mežnaršič, Tadej, Takehito Nakano, Yasuo Nozue, Naohiro Watanabe, and Arčon, Denis

Abstract

We report a 23Na spin-lattice relaxation rate, T-11, in low-silica X zeolite. T-11 follows multiple BPP-type behavior as a result of thermal motion of sodium cations in insulating material. The estimated lowest activation energy of 15 meV is much lower than 100 meV observed previously for sodium motion in heavily Na-loaded samples and is most likely attributed to short-distance jumps of sodium cations between sites within the same supercage. [ABSTRACT FROM AUTHOR]

Published
2017
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results