Upconverted electroluminescence via Auger scattering of interlayer excitons in van der Waals heterostructures

被引：58

作者：

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

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

Withers, F. ^{[5
]}

Molas, M. R. ^{[1
,2
]}

Taniguchi, T. ^{[6
]}

Watanabe, K. ^{[6
]}

Faugeras, C. ^{[1
]}

Wysmolek, A. ^{[2
]}

Danovich, M. ^{[3
,4
]}

Fal'ko, V. I. ^{[3
,4
,7
]}

Geim, A. K. ^{[3
,4
]}

Novoselov, K. S. ^{[3
,4
]}

Potemski, M. ^{[1
,2
]}

Kozikov, A. ^{[3
,4
]}

机构：

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

[2] Univ Warsaw, Fac Phys, Ul Pasteura 5, PL-02093 Warsaw, Poland

[3] Univ Manchester, Sch Phys & Astron, Oxford Rd, Manchester M13 9PL, Lancs, England

[4] Univ Manchester, Natl Graphene Inst, Oxford Rd, Manchester M13 9PL, Lancs, England

[5] Univ Exeter, Ctr Graphene Sci, Coll Engn Math & Phys Sci, Exeter EX4 4QF, Devon, England

[6] Natl Inst Mat Sci, 1-1 Namiki, Tsukuba, Ibaraki 3050044, Japan

[7] Henry Royce Inst Adv Mat, Manchester M13 9PL, Lancs, England

来源：

NATURE COMMUNICATIONS | 2019年 / 10卷 / 1期

基金：

英国工程与自然科学研究理事会; 欧洲研究理事会;

关键词：

ANNIHILATION; DYNAMICS;

D O I：

10.1038/s41467-019-10323-9

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

The intriguing physics of carrier-carrier interactions, which likewise affect the operation of light emitting devices, stimulate the research on semiconductor structures at high densities of excited carriers, a limit reachable at large pumping rates or in systems with long-lived electron-hole pairs. By electrically injecting carriers into WSe2/MoS2 type-II heterostructures which are indirect in real and k-space, we establish a large population of typical optically silent interlayer excitons. Here, we reveal their emission spectra and show that the emission energy is tunable by an applied electric field. When the population is further increased by suppressing the radiative recombination rate with the introduction of an hBN spacer between WSe2 and MoS2, Auger-type and exciton-exciton annihilation processes become important. These processes are traced by the observation of an up-converted emission demonstrating that excitons gaining energy in non-radiative Auger processes can be recovered and recombine radiatively.

引用

页数：7

共 40 条

[1] Many-body effects in nonlinear optical responses of 2D layered semiconductors [J].