Dark trions govern the temperature-dependent optical absorption and emission of doped atomically thin semiconductors

被引：50

作者：

Arora, Ashish ^{[1
,2
]}

Wessling, Nils Kolja ^{[1
,2
]}

Deilmann, Thorsten ^{[3
]}

Reichenauer, Till ^{[1
,2
]}

Steeger, Paul ^{[1
,2
]}

Kossacki, Piotr ^{[4
]}

Potemski, Marek ^{[4
,5
]}

de Vasconcellos, Steffen Michaelis ^{[1
,2
]}

Rohlfing, Michael ^{[3
]}

Bratschitsch, Rudolf ^{[1
,2
]}

机构：

[1] Univ Munster, Inst Phys, Wilhelm Klemm Str 10, D-48149 Munster, Germany

[2] Univ Munster, Ctr Nanotechnol, Wilhelm Klemm Str 10, D-48149 Munster, Germany

[3] Univ Munster, Inst Solid State Theory, Wilhelm Klemm Str 10, D-48149 Munster, Germany

[4] Univ Warsaw, Fac Phys, Inst Expt Phys, Ulica Pasteura 5, PL-02093 Warsaw, Poland

[5] CNRS UGA UPS INSA EMFL, Lab Natl Champs Magnet Intenses, 25 Ave Martyrs, F-38042 Grenoble, France

来源：

PHYSICAL REVIEW B | 2020年 / 101卷 / 24期

关键词：

CHARGED EXCITONS; FEW-LAYER; MONOLAYER; EXCITATIONS; GAP;

D O I：

10.1103/PhysRevB.101.241413

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We perform absorption and photoluminescence spectroscopy of trions in hBN-encapsulated WSe2, WS2,MoSe2, and MoS2 monolayers, depending on temperature. The different trends for W- and Mo-based materials are excellently reproduced considering a Fermi-Dirac distribution of bright and dark trions. We find a dark trion, X-D(-), 19 meV below the lowest bright trion, X-1(-), in WSe2 and WS2. In MoSe2, X-D(-) lies 6 meV above X-1(-), while X-D(-) and X-1(-) almost coincide in MoS2. Our results agree with GW-Bethe-Salpeter equation (GW-BSE) ab initio calculations and quantitatively explain the optical response of doped monolayers with temperature.

引用

页数：6

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