Dimensionality-driven orthorhombic MoTe2 at room temperature

被引：54

作者：

He, Rui ^{[1
,2
]}

Zhong, Shazhou ^{[3
,4
]}

Kim, Hyun Ho ^{[3
,5
]}

Ye, Gaihua ^{[2
]}

Ye, Zhipeng ^{[1
]}

Winford, Logan ^{[2
]}

McHaffie, Daniel ^{[3
,5
]}

Rilak, Ivana ^{[3
]}

Chen, Fangchu ^{[6
,7
]}

Luo, Xuan ^{[6
]}

Sun, Yuping ^{[6
,8
,9
]}

Tsen, Adam W. ^{[3
,5
]}

机构：

[1] Texas Tech Univ, Dept Elect & Comp Engn, Lubbock, TX 79409 USA

[2] Univ Northern Iowa, Dept Phys, Cedar Falls, IA 50614 USA

[3] Univ Waterloo, Inst Quantum Comp, Waterloo, ON N2L 3G1, Canada

[4] Univ Waterloo, Dept Phys & Astron, Waterloo, ON N2L 3G1, Canada

[5] Univ Waterloo, Dept Chem, Waterloo, ON N2L 3G1, Canada

[6] Chinese Acad Sci, Inst Solid State Phys, Key Lab Mat Phys, Hefei 230031, Anhui, Peoples R China

[7] Univ Sci & Technol China, Hefei 230026, Anhui, Peoples R China

[8] Chinese Acad Sci, High Field Magnet Lab, Hefei 230031, Anhui, Peoples R China

[9] Nanjing Univ, Collaborat Innovat Ctr Adv Microstruct, Nanjing 210093, Jiangsu, Peoples R China

来源：

PHYSICAL REVIEW B | 2018年 / 97卷 / 04期

基金：

美国国家科学基金会; 中国国家自然科学基金; 加拿大自然科学与工程研究理事会;

关键词：

STRUCTURAL PHASE-TRANSITION; INVERSION SYMMETRY-BREAKING; OPTOELECTRONICS;

D O I：

10.1103/PhysRevB.97.041410

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We use a combination of Raman spectroscopy and transport measurements to study thin flakes of the type-II Weyl semimetal candidate MoTe2 protected from oxidation. In contrast to bulk crystals, which undergo a phase transition from monoclinic to the inversion symmetry breaking, orthorhombic phase below similar to 250 K, we find that in moderately thin samples below similar to 12 nm, a single orthorhombic phase exists up to and beyond room temperature. This could be due to the effect of c-axis confinement, which lowers the energy of an out-of-plane hole band and stabilizes the orthorhombic structure. Our results suggest that Weyl nodes, predicated upon inversion symmetry breaking, may be observed in thin MoTe2 at room temperature.

引用

页数：5

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