Berlin 2024 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 36: Poster III
HL 36.30: Poster
Mittwoch, 20. März 2024, 18:00–20:30, Poster E
Exciton condensation in TiSe2 detected by screening of single-layer WSe2 — •Adrian Dewambrechies, Benjamin Weintrub, and Kirill Bolotin — Freie Universität Berlin, Germany
Two-dimensional materials and the recent progress in their manipulation have provided a platform to study highly correlated phenomena, a relevant case being the condensation of the excitons dominating their optical response. Recent advances show that the exciton properties, and their tunability in such systems, offer the observation of high temperature condensation, and allows the study of the crossover between different types of condensates including the Excitonic Insulator. However, a definitive proof of the exciton condensation and superfluidity is still missing mainly due to the charge of excitons being zero, and new experimental techniques are being explored in this direction. Here, we present our latest results in the detection of exciton condensation in two-dimentional semimetal TiSe2. We study its effect in the dielectric environment of a nearby sensor layer of WSe2, by tracking the emission and absorption of its excitons to understand charge transfer between the two materials and the potential transition to an excitonic insulating state in TiSe2.
Keywords: Screening; Exciton; Condensation; TiSe2; Heterostructure