Sub-bandgap Voltage Electroluminescence and Magneto-oscillations in a WSe2 Light-Emitting van der Waals Heterostructure

被引：47

作者：

Binder, Johannes ^{[1
,2
]}

Withers, Freddie ^{[3
,4
]}

Molas, Maciej R. ^{[1
]}

Faugeras, Clement ^{[1
]}

Nogajewski, Karol ^{[1
]}

Watanabe, Kenji ^{[5
]}

Taniguchi, Takashi ^{[5
]}

Kozikov, Aleksey ^{[3
,4
]}

Geim, Andre K. ^{[4
,6
]}

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

Potemski, Marek ^{[1
]}

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

[6] Univ Manchester, Manchester Ctr Mesosci & Nanotechnol, Oxford Rd, Manchester M13 9PL, Lancs, England

来源：

NANO LETTERS | 2017年 / 17卷 / 03期

基金：

欧洲研究理事会; 英国工程与自然科学研究理事会;

关键词：

Electroluminescence; magneto-oscillations; van der Waals heterostructures; tungsten diselenide; hexagonal boron nitride; acceptor; FIELD-EFFECT TRANSISTORS; GRAPHENE HETEROSTRUCTURES; DIODES; MONOLAYER; VALLEY;

D O I：

10.1021/acs.nanolett.6b04374

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We report on experimental investigations of an electrically driven WSe2 based light-emitting van der Waals heterostructure. We observe a threshold voltage for electroluminescence significantly lower than the corresponding single particle band gap of monolayer WSe2. This observation can be interpreted by considering the Coulomb interaction and a tunneling process involving excitons, well beyond the picture of independent charge carriers. An applied magnetic field reveals pronounced magneto-oscillations in the electroluminescence of the free exciton emission intensity with a 1/B periodicity. This effect is ascribed to a modulation of the tunneling probability resulting from the Landau quantization in the graphene electrodes. A sharp feature in the differential conductance indicates that the Fermi level is pinned and allows for an estimation of the acceptor binding energy.

引用

页码：1425 / 1430

页数：6

共 37 条

[1] Excitonic resonances in thin films of WSe2: from monolayer to bulk material [J].