Evidence for Exciton Crystals in a 2D Semiconductor Heterotrilayer

被引：15

作者：

Bai, Yusong ^{[1
]}

Li, Yiliu ^{[1
]}

Liu, Song ^{[2
]}

Guo, Yinjie ^{[3
]}

Pack, Jordan ^{[3
]}

Wang, Jue ^{[1
]}

Dean, Cory R. ^{[3
]}

Hone, James ^{[2
]}

Zhu, Xiaoyang ^{[1
]}

机构：

[1] Columbia Univ, Dept Chem, New York, NY 10027 USA

[2] Columbia Univ, Dept Mech Engn, New York, NY 10027 USA

[3] Columbia Univ, Dept Phys & Astron, New York, NY 10027 USA

来源：

NANO LETTERS | 2023年 / 23卷 / 24期

关键词：

exciton crystal; quadrupolarexciton; quantumphase transition; heterotrilayer; INTERLAYER EXCITONS; WIGNER CRYSTAL; MOIRE; ELECTRONS; STATES;

D O I：

10.1021/acs.nanolett.3c03453

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Two-dimensional (2D) transition metal dichalcogenides (TMDC) and their moir & eacute; interfaces have been demonstrated for correlated electron states, including Mott insulators and electron/hole crystals commensurate with moir & eacute; superlattices. Here we present spectroscopic evidence for ordered bosons & horbar;interlayer exciton crystals in a WSe2/MoSe2/WSe2 trilayer, where the enhanced Coulomb interactions over those in heterobilayers have been predicted to result in exciton ordering. Ordered interlayer excitons in the trilayer are characterized by negligible mobility and by sharper PL peaks persisting to an exciton density of n(ex) similar to 10(12) cm(-2), which is an order of magnitude higher than the corresponding limit in the heterobilayer. We present evidence for the predicted quadrupolar exciton crystal and its transitions to dipolar excitons either with increasing n(ex) or by an applied electric field. These ordered interlayer excitons may serve as models for the exploration of quantum phase transitions and quantum coherent phenomena.

引用

页码：11621 / 11629

页数：9

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