Singlet and triplet trions in WS2 monolayer encapsulated in hexagonal boron nitride

被引：73

作者：

Vaclavkova, D. ^{[1
,2
]}

Wyzula, J. ^{[1
,2
]}

Nogajewski, K. ^{[1
,3
]}

Bartos, M. ^{[1
]}

Slobodeniuk, A. O. ^{[1
]}

Faugeras, C. ^{[1
]}

Potemski, M. ^{[1
,3
]}

Molas, M. R. ^{[1
,3
]}

机构：

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

[2] Palacky Univ, Fac Sci, Dept Expt Phys, 17 Listopadu 12, Olomouc 77146, Czech Republic

[3] Univ Warsaw, Fac Phys, Inst Expt Phys, Ul Pasteura 5, PL-02093 Warsaw, Poland

来源：

NANOTECHNOLOGY | 2018年 / 29卷 / 32期

基金：

欧洲研究理事会;

关键词：

transition metal dichalcogenides; WS2; photoluminescence; trion; NEGATIVELY CHARGED EXCITONS; VALLEY POLARIZATION; FINE-STRUCTURE; DARK EXCITONS; LAYER;

D O I：

10.1088/1361-6528/aac65c

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Embedding a WS2 monolayer in flakes of hexagonal boron nitride allowed us to resolve and study the photoluminescence response due to both singlet and triplet states of negatively charged excitons (trions) in this atomically thin semiconductor. The energy separation between the singlet and triplet states has been found to be relatively small reflecting rather weak effects of the electron-electron exchange interaction for the trion triplet in a WS2 monolayer, which involves two electrons with the same spin but from different valleys. Polarization-resolved experiments demonstrate that the helicity of the excitation light is better preserved in the emission spectrum of the triplet trion than in that of the singlet trion. Finally, the singlet (intravalley) trions are found to be observable even at ambient conditions whereas the emission due to the triplet (intervalley) trions is only efficient at low temperatures.

引用

页数：6

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