Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session D23: Advances in Probing and Designing Topological Materials: Theory and Experiment
3:00 PM–6:00 PM,
Monday, March 6, 2023
Room: Room 215
Sponsoring
Unit:
DCMP
Chair: Clifford Hicks, University of Birmingham
Abstract: D23.00014 : Experimental evidence of Weyl and Dirac relativistic spectrum at topological Volkov-Pankratov heterojunctions*
5:36 PM–5:48 PM
Presenter:
Joaquin Bermejo Ortiz
(Ecole Normale Superieure)
Author:
Joaquin Bermejo Ortiz
(Ecole Normale Superieure)
Collaborations:
Laboratoire de Physique de l'Ecole normale supérieure, Institut für Halbleiter und Festkörperphysik, Johannes Kepler Universität, Institute of Physics, Polish Academy of Sciences
A striking example is the discovery of topological insulators, which are insulating in the bulk but exhibit a massless metallic chiral state (CS) at their boundaries. This CS obeys the Weyl equation and displays a relativistic energy-momentum relation. Using magneto-optical spectroscopy, we show in this work that massless Weyl and massive Dirac fermions intrinsically coexist on sufficiently smooth interfaces between a trivial and a topological material, an heterostructure called topological Volkov-Pankratov heterojunction. The emergence of the Dirac states, known as Volkov-Pankratov states, is directly observed, evidencing that their energy levels are perfectly controlled by the smoothness of the interface. Simultaneously, we reveal the optical absorption of the zero-energy chiral Weyl state, whose wavefunction is drastically transformed when going from smooth to the abrupt interface limit. Our work thus introduces a textbook system to explore in detail the rich relativistic energy spectra in condensed matter.
*The authors acknowledge the funding support of the ANR (Contract N° ANR-19-CE30-022-01) and the Austrian Science Funds FWF (Project I-4493).
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