Interlayer exciton dynamics in a dichalcogenide monolayer heterostructure

被引：161

作者：

Nagler, Philipp ^{[1
]}

Plechinger, Gerd ^{[1
]}

Ballottin, Mariana V. ^{[2
]}

Mitioglu, Anatolie ^{[2
]}

Meier, Sebastian ^{[1
]}

Paradiso, Nicola ^{[1
]}

Strunk, Christoph ^{[1
]}

Chernikov, Alexey ^{[1
]}

Christianen, Peter C. M. ^{[2
]}

Schueller, Christian ^{[1
]}

Korn, Tobias ^{[1
]}

机构：

[1] Univ Regensburg, Inst Expt & Angew Phys, D-93040 Regensburg, Germany

[2] Radboud Univ Nijmegen, High Field Magnet Lab HFML EMFL, NL-6525 ED Nijmegen, Netherlands

来源：

2D MATERIALS | 2017年 / 4卷 / 02期

关键词：

transition-metal dichalcogenides; heterostructures; interlayer excitons; QUANTUM-WELLS; TRANSITION; COHERENCE; GRAPHENE; SPIN; MOS2/WS2; ENERGY; LAYERS; WSE2; WS2;

D O I：

10.1088/2053-1583/aa7352

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In heterostructures consisting of different transition-metal dichalcogenide monolayers, a staggered band alignment can occur, leading to rapid charge separation of optically generated electron-hole pairs into opposite monolayers. These spatially separated electron-hole pairs are Coulomb-coupled and form interlayer excitons. Here, we study these interlayer excitons in a heterostructure consisting of MoSe2 and WSe2 monolayers using photoluminescence spectroscopy. We observe a non-trivial temperature dependence of the linewidth and the peak energy of the interlayer exciton, including an unusually strong initial redshift of the transition with temperature, as well as a pronounced blueshift of the emission energy with increasing excitation power. By combining these observations with time-resolved photoluminescence measurements, we are able to explain the observed behavior as a combination of interlayer exciton diffusion and dipolar, repulsive exciton-exciton interaction.

引用

页数：9

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