Intravalley scattering probed by excitation energy dependence of valley polarization in monolayer MoS2

被引：7

作者：

Asakura, Eito ^{[1
]}

Odagawa, Takeshi ^{[1
]}

Suzuki, Masaki ^{[1
]}

Karube, Shutaro ^{[1
,2
]}

Nitta, Junsaku ^{[1
,2
,3
]}

Kohda, Makoto ^{[1
,2
,3
,4
]}

机构：

[1] Tohoku Univ, Dept Mat Sci, Sendai, Miyagi 9808579, Japan

[2] Tohoku Univ, Ctr Spintron Res Network, Sendai, Miyagi 9808577, Japan

[3] Tohoku Univ, Core Res Cluster, Ctr Sci & Innovat Spintron, Sendai, Miyagi, Japan

[4] Tohoku Univ, Div Estab Frontier Sci, Sendai, Miyagi 9808577, Japan

来源：

JOURNAL OF PHYSICS D-APPLIED PHYSICS | 2021年 / 54卷 / 48期

基金：

英国工程与自然科学研究理事会;

关键词：

transition metal dichalcogenides; spintronics; optical excitation; valleytronics; valley polarization; SPIN;

D O I：

10.1088/1361-6463/ac1626

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Steady-state valley polarization caused by polarized photoexcitation at various excitation energies reveals intravalley scattering from B excitons to A excitons in a monolayer of MoS2. When the excitation energy of circularly polarized light is increased from near the level of excitation of the A exciton, the valley polarization detected in the A exciton decreases monotonously and is completely suppressed due to phonon-mediated scattering. However, excitation to levels greater than the B-exciton energy recovers the valley polarization in the A exciton. By considering the suppressed valley coherence and the sign of the valley polarization, together with the higher energy shift of the recovered peak polarization of B-exciton resonance, we find that the polarization recovery originates from the phonon-mediated intravalley scattering from B excitons to A excitons in the same valley.

引用

页数：7

共 23 条

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