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Your search keyword '"Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556"' showing total 2 results
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2 results on '"Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556"'

1. Miniband engineering and topological phase transitions in topological-insulator–normal-insulator superlattices

Author

Badih A. Assaf, G. Krizman, L. A. de Vaulchier, Gunther Springholz, G. Bauer, Yves Guldner, Nano-THz, Laboratoire de physique de l'ENS - ENS Paris (LPENS), Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-Sorbonne Université (SU)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-Sorbonne Université (SU)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), Institut für Halbleiter und Festkörperphysik, Johannes Kepler Universität, Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, Laboratoire de physique de l'ENS - ENS Paris (LPENS (UMR_8023)), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-École normale supérieure - Paris (ENS Paris), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)

Subjects
Condensed Matter::Quantum Gases, Physics, Condensed Matter - Materials Science, Phase transition, Valence (chemistry), Condensed Matter - Mesoscale and Nanoscale Physics, Superlattice, Materials Science (cond-mat.mtrl-sci), FOS: Physical sciences, 02 engineering and technology, Landau quantization, Condensed Matter::Mesoscopic Systems and Quantum Hall Effect, 021001 nanoscience & nanotechnology, Topology, 01 natural sciences, Semimetal, 3. Good health, Topological insulator, Mesoscale and Nanoscale Physics (cond-mat.mes-hall), 0103 physical sciences, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], 010306 general physics, 0210 nano-technology, Electronic band structure, Topology (chemistry)
Abstract

Periodic stacking of topologically trivial and non-trivial layers with opposite symmetry of the valence and conduction bands induces topological interface states that, in the strong coupling limit, hybridize both across the topological and normal insulator layers. Using band structure engineering, such superlattices can be effectively realized using the IV-VI lead tin chalcogenides. This leads to emergent minibands with a tunable topology as demonstrated both by theory and experiments. The topological minibands are proven by magneto-optical spectroscopy, revealing Landau level transitions both at the center and edges of the artificial superlattice mini Brillouin zone. Their topological character is identified by the topological phase transitions within the minibands observed as a function of temperature. The critical temperature of this transition as well as the miniband gap and miniband width can be precisely controlled by the layer thicknesses and compositions. This witnesses the generation of a new fully tunable quasi-3D topological state that provides a template for realization of magnetic Weyl semimetals and other strongly interacting topological phases., 21 pages, 8 figures

Published
2021

2. SCExAO/CHARIS High-contrast Imaging of Spirals and Darkening Features in the HD 34700 A Protoplanetary Disk

Author

Jeremy Kasdin, Tyler D. Groff, Thayne Currie, Masahiko Hayashi, Taichi Uyama, Takayuki Muto, John P. Wisniewski, Nemanja Jovanovic, Motohide Tamura, Yi Yang, Michael L. Sitko, Valentin Christiaens, Julien Lozi, Olivier Guyon, Sanemichi Z. Takahashi, Frantz Martinache, Jeffrey Chilcote, Carol A. Grady, Timothy D. Brandt, Charles A. Beichman, Marie Ygouf, Michihiro Takami, Eiji Akiyama, Kevin Wagner, Tomoyuki Kudo, Michael W. McElwain, Jungmi Kwon, Jaehan Bae, Gillian R. Knapp, Ryo Tazaki, Université Côte d'Azur, Observatoire de la Côte d'Azur, CNRS, Laboratoire Lagrange, Nice, France, The University of Tokyo (UTokyo), National Astronomical Observatory of Japan (NAOJ), Space Sciences, Technologies and Astrophysics Research Institute (STAR), Université de Liège, Carnegie Institution for Science, NASA ExoPlanet Science Institute (NExScI), California Institute of Technology (CALTECH), Princeton University, NASA, Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, Department of Earth System Science and Technology [Fukuoka] (ESST), Kyushu University [Fukuoka], and National Astronomical Observatory of Japan, Subaru Telescope, 650 North A‘ohoku Place, Hilo, HI 96720, United States

Subjects
010504 meteorology & atmospheric sciences, [PHYS.ASTR.EP]Physics [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP], FOS: Physical sciences, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, Protoplanetary disk, Ring (chemistry), 01 natural sciences, 0103 physical sciences, Astrophysics::Solar and Stellar Astrophysics, Surface brightness, 010303 astronomy & astrophysics, ComputingMilieux_MISCELLANEOUS, Solar and Stellar Astrophysics (astro-ph.SR), Astrophysics::Galaxy Astrophysics, Spiral, 0105 earth and related environmental sciences, Envelope (waves), Earth and Planetary Astrophysics (astro-ph.EP), Physics, Astronomy and Astrophysics, Scale height, High contrast imaging, Position angle, Astrophysics - Solar and Stellar Astrophysics, 13. Climate action, Space and Planetary Science, Astrophysics::Earth and Planetary Astrophysics, Astrophysics - Earth and Planetary Astrophysics
Abstract

We present Subaru/SCExAO+CHARIS broadband ($JHK$-band) integral field spectroscopy of HD 34700 A. CHARIS data recover HD 34700 A's disk ring and confirm multiple spirals discovered in Monnier et al. (2019). We set limits on substellar companions of $\sim12\ M_{\rm Jup}$ at $0\farcs3$ (in the ring gap) and $\sim5\ M_{\rm Jup}$ at $0\farcs75$ (outside the ring). The data reveal darkening effects on the ring and spiral, although we do not identify the origin of each feature such as shadows or physical features related to the outer spirals. Geometric albedoes converted from the surface brightness suggests a higher scale height and/or prominently abundant sub-micron dust at position angle between $\sim45^\circ$ and $90^\circ$. Spiral fitting resulted in very large pitch angles ($\sim30-50^\circ$) and a stellar flyby of HD 34700 B or infall from a possible envelope is perhaps a reasonable scenario to explain the large pitch angles., 17 pages, 14 figures, accepted for publication in ApJ

Published
2020

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