Confined-state physics and signs of fermionization of moire excitons in WSe2/MoSe2 heterobilayers

被引：7

作者：

Lohof, F. ^{[1
,2
]}

Michl, J. ^{[3
,4
]}

Steinhoff, A. ^{[1
,2
]}

Han, B. ^{[5
]}

von Helversen, M. ^{[7
]}

Tongay, S. ^{[8
]}

Watanabe, K. ^{[9
]}

Taniguchi, T. ^{[10
]}

Hoefling, S. ^{[3
,4
]}

Reitzenstein, S. ^{[7
]}

Anton-Solanas, C. ^{[11
]}

Gies, C. ^{[1
,2
]}

Schneider, C. ^{[5
,6
]}

机构：

[1] Univ Bremen, Inst Theoret Phys, D-28359 Bremen, Germany

[2] Univ Bremen, Bremen Ctr Computat Mat Sci, D-28359 Bremen, Germany

[3] Julius Maximilians Univ Wurzburg, Phys Inst, D-97074 Wurzburg, Germany

[4] Lehrstuhl Tech Phys, Wurzburg Dresden Cluster Excellence Ctqmat, D-97074 Wurzburg, Germany

[5] Carl von Ossietzky Univ Oldenburg, Inst Phys, D-26129 Oldenburg, Germany

[6] Carl von Ossietzky Univ Oldenburg, Ctr Nanoscale Dynam, D-26129 Oldenburg, Germany

[7] Tech Univ Berlin, Inst Festkorperphys, Hardenbergstr 36, D-10623 Berlin, Germany

[8] Arizona State Univ, Sch Engn Matter Transport & Energy, Tempe, AZ 85287 USA

[9] Natl Inst Mat Sci, Res Ctr Funct Mat, 1-1 Namiki, Tsukuba 3050044, Japan

[10] Natl Inst Mat Sci, Int Ctr Mat Nanoarchitecton, 1-1 Namiki, Tsukuba 3050044, Japan

[11] Univ Autonoma Madrid, Inst Nicolas Cabrera, Inst Fis Mat Condensada, Dept Fis Mat, Madrid 28049, Spain

来源：

2D MATERIALS | 2023年 / 10卷 / 03期

基金：

欧洲研究理事会;

关键词：

moire excitons; quantum dots; non-linear interaction; exciton trapping; van der Waals heterostructures;

D O I：

10.1088/2053-1583/acd265

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We revisit and extend the standard bosonic interpretation of interlayer excitons (ILX) in the moire potential of twisted heterostructures of transition-metal dichalcogenides. In our experiments, we probe a high quality MoSe2/WSe2 van der Waals bilayer heterostructure via density-dependent photoluminescence spectroscopy and reveal strongly developed, unconventional spectral shifts of the emergent moire exciton resonances. The observation of saturating blueshifts of successive exciton resonances allow us to explain their physics in terms of a model utilizing fermionic saturable absorbers. This approach is strongly inspired by established quantum-dot models, which underlines the close analogy of ILX trapped in pockets of the moire potential, and quantum emitters with discrete eigenstates.

引用

页数：7

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