Strongly Interaction-Enhanced Valley Magnetic Response in Monolayer WSe2

被引：51

作者：

Wang, Zefang ^{[1
,2
,3
,4
]}

Mak, Kin Fai ^{[1
,2
,3
,4
,5
]}

Shan, Jie ^{[1
,2
,3
,4
,5
]}

机构：

[1] Penn State Univ, Dept Phys, 104 Davey Lab, University Pk, PA 16802 USA

[2] Penn State Univ, Ctr Dimens & Layered Mat 2, University Pk, PA 16802 USA

[3] Cornell Univ, Sch Appl & Engn Phys, Ithaca, NY 14853 USA

[4] Cornell Univ, Dept Phys, Ithaca, NY 14853 USA

[5] Kavli Inst Cornell Nanoscale Sci, Ithaca, NY 14853 USA

来源：

PHYSICAL REVIEW LETTERS | 2018年 / 120卷 / 06期

基金：

美国国家科学基金会;

关键词：

MOS2; SPIN; POLARIZATION; EMITTERS;

D O I：

10.1103/PhysRevLett.120.066402

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We measure the doping dependence of the valley Zeeman splitting of the fundamental optical transitions in monolayer WSe2 under an out-of-plane magnetic field by optical reflection contrast and photoluminescence spectroscopy. A nonlinear valley Zeeman effect, correlated with an over fourfold enhancement in the g factor, is observed. The effect occurs when the Fermi level crosses the spin-split upper conduction band, corresponding to a change of the spin-valley degeneracy from two to four. The enhancement increases and shows no sign of saturation as the sample temperature decreases. Our result demonstrates the importance of the Coulomb interactions in the valley magnetic response of two-dimensional transition metal dichalcogenide semiconductors.

引用

页数：6

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