Room-Temperature Nanoseconds Spin Relaxation in WTe2 and MoTe2 Thin Films

被引：39

作者：

Wang, Qisheng ^{[1
,2
]}

Li, Jie ^{[3
]}

Besbas, Jean ^{[1
,2
]}

Hsu, Chuang-Han ^{[4
,5
,6
]}

Cai, Kaiming ^{[8
]}

Yang, Li ^{[3
]}

Cheng, Shuai ^{[3
]}

Wu, Yang ^{[1
,2
]}

Zhang, Wenfeng ^{[3
]}

Wang, Kaiyou ^{[8
]}

Chang, Tay-Rong ^{[9
]}

Lin, Hsin ^{[4
,5
,6
,7
]}

Chang, Haixin ^{[3
]}

Yang, Hyunsoo ^{[1
,2
]}

机构：

[1] Natl Univ Singapore, Dept Elect & Comp Engn, Singapore 117576, Singapore

[2] Natl Univ Singapore, NUSNNI, Singapore 117576, Singapore

[3] Huazhong Univ Sci & Technol, Ctr Joining & Elect Packaging, State Key Lab Mat Proc & Die & Mould Technol, Sch Mat Sci & Engn, Wuhan 430074, Hubei, Peoples R China

[4] Natl Univ Singapore, Dept Phys, 2 Sci Dr 3, Singapore 117542, Singapore

[5] Natl Univ Singapore, Ctr Adv Mat 2D, 6 Sci Dr 2, Singapore 117546, Singapore

[6] Natl Univ Singapore, Graphene Res Ctr, 6 Sci Dr 2, Singapore 117546, Singapore

[7] Acad Sinica, Inst Phys, Taipei 11529, Taiwan

[8] Chinese Acad Sci, SKLSM, Inst Semicond, POB 912, Beijing 100083, Peoples R China

[9] Natl Cheng Kung Univ, Dept Phys, Tainan 701, Taiwan

来源：

ADVANCED SCIENCE | 2018年 / 5卷 / 06期

基金：

新加坡国家研究基金会;

关键词：

2D materials; spin dynamics; spin polarization; time-resolved Kerr rotation; Weyl semimetals; SEMIMETAL; STATE; MOS2;

D O I：

10.1002/advs.201700912

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The Weyl semimetal WTe2 and MoTe2 show great potential in generating large spin currents since they possess topologically protected spin-polarized states and can carry a very large current density. In addition, the intrinsic non-centrosymmetry of WTe2 and MoTe2 endows with a unique property of crystal symmetry-controlled spin-orbit torques. An important question to be answered for developing spintronic devices is how spins relax in WTe2 and MoTe2. Here, a room-temperature spin relaxation time of 1.2ns (0.4ns) in WTe2 (MoTe2) thin film using the time-resolved Kerr rotation (TRKR) is reported. Based on ab initio calculation, a mechanism of long-lived spin polarization resulting from a large spin splitting around the bottom of the conduction band, low electron-hole recombination rate, and suppression of backscattering required by time-reversal and lattice symmetry operation is identified. In addition, it is found that the spin polarization is firmly pinned along the strong internal out-of-plane magnetic field induced by large spin splitting. This work provides an insight into the physical origin of long-lived spin polarization in Weyl semimetals, which could be useful to manipulate spins for a long time at room temperature.

引用

页数：7

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