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Giant Valley-Polarized Rydberg Excitons in Monolayer WSe 2 Revealed by Magneto-photocurrent Spectroscopy.

Authors :
Wang T
Li Z
Li Y
Lu Z
Miao S
Lian Z
Meng Y
Blei M
Taniguchi T
Watanabe K
Tongay S
Smirnov D
Zhang C
Shi SF
Source :
Nano letters [Nano Lett] 2020 Oct 14; Vol. 20 (10), pp. 7635-7641. Date of Electronic Publication: 2020 Sep 14.
Publication Year :
2020

Abstract

A strong Coulomb interaction could lead to a strongly bound exciton with high-order excited states, similar to the Rydberg atom. The interaction of giant Rydberg excitons can be engineered for a correlated ordered exciton array with a Rydberg blockade, which is promising for realizing quantum simulation. Monolayer transition metal dichalcogenides, with their greatly enhanced Coulomb interaction, are an ideal platform to host the Rydberg excitons in two dimensions. Here, we employ helicity-resolved magneto-photocurrent spectroscopy to identify Rydberg exciton states up to 11s in monolayer WSe <subscript>2</subscript> . Notably, the radius of the Rydberg exciton at 11s can be as large as 214 nm, orders of magnitude larger than the 1s exciton. The giant valley-polarized Rydberg exciton not only provides an exciting platform to study the strong exciton-exciton interaction and nonlinear exciton response but also allows the investigation of the different interplay between the Coulomb interaction and Landau quantization, tunable from a low- to high-magnetic-field limit.

Details

Language :
English
ISSN :
1530-6992
Volume :
20
Issue :
10
Database :
MEDLINE
Journal :
Nano letters
Publication Type :
Academic Journal
Accession number :
32902286
Full Text :
https://doi.org/10.1021/acs.nanolett.0c03167