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9 results on '"Pastor, Ernest"'

1. Propagation of insulator-to-metal transition driven by photoinduced strain waves in a Mott material

Author

Amano, Tatsuya, Babich, Danylo, Mandal, Ritwika, Guzman-Brambila, Julio, Volte, Alix, Trzop, Elzbieta, Servol, Marina, Pastor, Ernest, Alashoor, Maryam, Larsson, Jörgen, Jurgilaitis, Andrius, Pham, Van-Thai, Kroon, David, Ekström, John Carl, Ahn, Byungnam, Mariette, Céline, Levantino, Matteo, Kozhaev, Mikhail, Tranchant, Julien, Corraze, Benoit, Cario, Laurent, Dolatabadi, Mohammad, Phuoc, Vinh Ta, Sopracase, Rodolphe, Guillon, Mathieu, Itoh, Hirotake, Kawakami, Yohei, Nakamura, Yuto, Kishida, Hideo, Cailleau, Hervé, Lorenc, Maciej, Iwai, Shinichiro, and Janod, Etienne

Published
2024
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2. Ultrafast lattice disordering can be accelerated by electronic collisional forces

Author

Munoz, Gilberto A. de la Pena, Correa, Alfredo A., Yang, Shan, Delaire, Olivier, Huang, Yijing, Johnson, Allan S., Katayama, Tetsuo, Krapivin, Viktor, Pastor, Ernest, Reis, David A., Teitelbaum, Samuel, Vidas, Luciana, Wall, Simon, and Trigo, Mariano

Subjects
Condensed Matter - Strongly Correlated Electrons
Abstract

In the prevalent picture of ultrafast structural phase transitions, the atomic motion occurs in a slowly varying potential energy surface determined adiabatically by the fast electrons. However, this ignores non-conservative forces caused by electron-lattice collisions, which can significantly influence atomic motion. Most ultrafast techniques only probe the average structure and are less sensitive to random displacements, and therefore do not detect the role played by non-conservative forces in phase transitions. Here we show that the lattice dynamics of the prototypical insulator-to-metal transition of VO2 cannot be described by a potential energy alone. We use the sample temperature to control the preexisting lattice disorder before ultrafast photoexcitation across the phase transition and our ultrafast diffuse scattering experiments show that the fluctuations characteristic of the rutile metal develop equally fast (120 fs) at initial temperatures of 100 K and 300 K. This indicates that additional non-conservative forces are responsible for the increased lattice disorder. These results highlight the need for more sophisticated descriptions of ultrafast phenomena beyond the Born-Oppenheimer approximation as well as ultrafast probes of spatial fluctuations beyond the average unit cell measured by diffraction.

Published
2024
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4. Publisher Correction: Propagation of insulator-to-metal transition driven by photoinduced strain waves in a Mott material

Author

Amano, Tatsuya, Babich, Danylo, Mandal, Ritwika, Guzman-Brambila, Julio, Volte, Alix, Trzop, Elzbieta, Servol, Marina, Pastor, Ernest, Alashoor, Maryam, Larsson, Jörgen, Jurgilaitis, Andrius, Pham, Van-Thai, Kroon, David, Ekström, John Carl, Ahn, Byungnam, Mariette, Céline, Levantino, Matteo, Kozhaev, Mikhail, Tranchant, Julien, Corraze, Benoit, Cario, Laurent, Dolatabadi, Mohammad, Phuoc, Vinh Ta, Sopracase, Rodolphe, Guillon, Mathieu, Itoh, Hirotake, Kawakami, Yohei, Nakamura, Yuto, Kishida, Hideo, Cailleau, Hervé, Lorenc, Maciej, Iwai, Shinichiro, and Janod, Etienne

Published
2024
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8. Complementary probes for the electrochemical interface

Author

Ministerio de Ciencia, Innovación y Universidades (España), European Commission, Ministerio de Ciencia e Innovación (España), Agencia Estatal de Investigación (España), Fundació Privada Cellex, Fundación Privada Mir-Puig, Fundación la Caixa, European Research Council, Generalitat de Catalunya, Eusko Jaurlaritza, Agence Nationale de la Recherche (France), Comunidad de Madrid, Pastor, Ernest, Lian, Zan, Écija, David, Galán-Mascarós, José Ramón, Barja, Sara, Giménez, Sixto, Arbiol, Jordi, López, Núria, Pelayo García de Arquer, F., Ministerio de Ciencia, Innovación y Universidades (España), European Commission, Ministerio de Ciencia e Innovación (España), Agencia Estatal de Investigación (España), Fundació Privada Cellex, Fundación Privada Mir-Puig, Fundación la Caixa, European Research Council, Generalitat de Catalunya, Eusko Jaurlaritza, Agence Nationale de la Recherche (France), Comunidad de Madrid, Pastor, Ernest, Lian, Zan, Écija, David, Galán-Mascarós, José Ramón, Barja, Sara, Giménez, Sixto, Arbiol, Jordi, López, Núria, and Pelayo García de Arquer, F.

Abstract

The functions of electrochemical energy conversion and storage devices rely on the dynamic junction between a solid and a fluid: the electrochemical interface (EI). Many experimental techniques have been developed to probe the EI, but they provide only a partial picture. Building a full mechanistic understanding requires combining multiple probes, either successively or simultaneously. However, such combinations lead to important technical and theoretical challenges. In this Review, we focus on complementary optoelectronic probes and modelling to address the EI across different timescales and spatial scales — including mapping surface reconstruction, reactants and reaction modulators during operation. We discuss how combining these probes can facilitate a predictive design of the EI when closely integrated with theory.

Published
2024

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