Dresden 2026 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 61: Topology – Poster
TT 61.1: Poster
Wednesday, March 11, 2026, 15:00–17:00, P4
Topological Surface States for the Implementation of a Landau Level Laser — •Olivier Fayet1, Jean-Noël Fuchs2, and Piéchon Frédéric1 — 1Laboratoire de physique des solides, université Paris-Saclay et CNRS, Orsay, France — 2Laboratoire de physique théorique de la matière condensée, Sorbonne Université et CNRS, Paris
Landau levels have since long been proposed for the implementation of a tunable laser in the THz regime. However, rapid non-radiative relaxation processes (Auger processes, disorder) are preventing population inversion. The former may to some extent be circumvented by the choice of a material with a non-equidistant Landau levels spectrum, e.g. in bilayer graphene or in the surface states of a topological heterojunction, called Volkov-Pankratov states. Under a strong magnetic field, the latter are quantised into Landau levels, recently observed in transport and spectroscopic measurements at the LPENS (Paris), based on predictions from the LPS theory group. To study the possibility of obtaining laser emission with these states, a detailed study of the different life times fo electrons in the associated Landau level is required.
Keywords: Landau levels; Optical coupling