Dresden 2017 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 6: Focus Session: Two-Dimensional Materials I (joint session DS, HL, TT, organized by HL)
TT 6.3: Vortrag
Montag, 20. März 2017, 10:15–10:30, POT 81
Layered semiconductors coupled to an optical microcavity — •Michael Förg1, Hisato Yamaguchi2, David Hunger3,4, and Alexander Högele1 — 1Fakultät für Physik and Center for NanoScience (CeNS), Ludwig-Maximilians-Universität München, Germany — 2Materials Physics and Applications Division, Los Alamos National Laboratory, USA — 3Ludwig-Maximilians-Universität München, Schellingstr. 4, München, Germany — 4Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Str. 1, Garching, Germany
Two-dimensional atomic crystals of transition metal dichalcogenides exhibit remarkable optoelectronic properties in the limit of direct band-gap monolayers [1]. Bilayer heterostructures, on the other hand, feature long-lived indirect excitons potentially viable for studies of condensation phenomena [2]. In the scope of this work we investigate excitons in CVD grown layered semiconductors coupled to an optical microcavity. In our experiments we use a tunable open-access cavity with one curved fiber-based mirror and one planar mirror which supports laterally extended semiconductor flakes. This configuration allows us to combine controlled inter-mirror spacing with lateral scanning capabilities. While the former parameter is used to explore the light-matter coupling as a function of the cavity length, the latter enables two-dimensional cavity imaging of extended monolayer flakes to probe variations in the local crystal quality and the dielectric environment.
[1] Xu et al., Nat. Phys. 10, 343 (2014)
[2] Rivera et al., Nat. commun. 6 (2015)