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Proceedings Paper

Pb1-xSnxSe: a new tunable topological platform with terahertz band gap
Author(s): G. Krizman; B. A. Assaf; G. Bauer; G. Springholz; R. Ferreira; G. Bastard; L.-A. de Vaulchier; Y. Guldner
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Paper Abstract

In a topological crystalline insulator such as Pb1-xSnxSe, massless Dirac states emerge at an interface with a trivial insulator. We demonstrate the great versatility of Pb1-xSnxSe electronic properties, which makes it a highly promising material to control the massless Dirac states emerging from topological properties. Using magnetooptical transmission spectroscopy on high quality molecular beam epitaxy grown Pb1-xSnxSe, we probe the variation of its bulk energy gap versus chemical composition, temperature, and strain. The determination of its bulk electronic properties will be of critical relevance to design heterostructures. A magneto-optical study on PbSnSe/PbEuSe superlattices will allow us to characterize the topological interface states occurring at each interface, as well as their tunability versus temperature. The engineering of these massless states is shown to be a promising route to achieve photo detection and photoemission in the terahertz range.

Paper Details

Date Published: 6 September 2019
PDF: 11 pages
Proc. SPIE 11124, Terahertz Emitters, Receivers, and Applications X, 111240R (6 September 2019); doi: 10.1117/12.2529335
Show Author Affiliations
G. Krizman, Ecole Normale Supérieure (France)
B. A. Assaf, Ecole Normale Supérieure (France)
Univ. of Notre Dame (United States)
G. Bauer, Johannes Kepler Univ. Linz (Austria)
G. Springholz, Johannes Kepler Univ. Linz (Austria)
R. Ferreira, Ecole Normale Supérieure (France)
G. Bastard, Ecole Normale Supérieure (France)
L.-A. de Vaulchier, Ecole Normale Supérieure (France)
Y. Guldner, Ecole Normale Supérieure (France)

Published in SPIE Proceedings Vol. 11124:
Terahertz Emitters, Receivers, and Applications X
Manijeh Razeghi; Alexei N. Baranov; Miriam S. Vitiello, Editor(s)

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