Spin-valley locking in the normal state of a transition-metal dichalcogenide superconductor

被引：100

作者：

Bawden, L. ^{[1
]}

Cooil, S. P. ^{[2
]}

Mazzola, F. ^{[2
]}

Riley, J. M. ^{[1
,3
]}

Collins-McIntyre, L. J. ^{[1
]}

Sunko, V. ^{[1
,4
]}

Hunvik, K. W. B. ^{[2
]}

Leandersson, M. ^{[5
]}

Polley, C. M. ^{[5
]}

Balasubramanian, T. ^{[5
]}

Kim, T. K. ^{[3
]}

Hoesch, M. ^{[3
]}

Wells, J. W. ^{[2
]}

Balakrishnan, G. ^{[6
]}

Bahramy, M. S. ^{[7
,8
,9
]}

King, P. D. C. ^{[1
]}

机构：

[1] Univ St Andrews, Dept Phys & Astron, SUPA, St Andrews KY16 9SS, Fife, Scotland

[2] Norwegian Univ Sci & Technol NTNU, Dept Phys, N-7491 Trondheim, Norway

[3] Diamond Light Source, Harwell Campus, Didcot OX11 0DE, Oxon, England

[4] Max Planck Inst Chem Phys Solids, Nothnitzer Str 40, D-01217 Dresden, Germany

[5] Lund Univ, MAX Lab 4, POB 118, S-22100 Lund, Sweden

[6] Univ Warwick, Dept Phys, Coventry CV4 7AL, W Midlands, England

[7] Univ Tokyo, Quantum Phase Elect Ctr, Tokyo 1138656, Japan

[8] Univ Tokyo, Dept Appl Phys, Tokyo 1138656, Japan

[9] RIKEN Ctr Emergent Matter Sci CEMS, Wako, Saitama 3510198, Japan

来源：

NATURE COMMUNICATIONS | 2016年 / 7卷

基金：

英国工程与自然科学研究理事会; 瑞典研究理事会;

关键词：

CHARGE-ORDER; POLARIZATION; MOS2; 2H-NBSE2; WAVES;

D O I：

10.1038/ncomms11711

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Metallic transition-metal dichalcogenides (TMDCs) are benchmark systems for studying and controlling intertwined electronic orders in solids, with superconductivity developing from a charge-density wave state. The interplay between such phases is thought to play a critical role in the unconventional superconductivity of cuprates, Fe-based and heavy-fermion systems, yet even for the more moderately-correlated TMDCs, their nature and origins have proved controversial. Here, we study a prototypical example, 2H-NbSe2, by spin-and angle-resolved photoemission and first-principles theory. We find that the normal state, from which its hallmark collective phases emerge, is characterized by quasiparticles whose spin is locked to their valley pseudospin. This results from a combination of strong spin-orbit interactions and local inversion symmetry breaking, while interlayer coupling further drives a rich three-dimensional momentum dependence of the underlying Fermi-surface spin texture. These findings necessitate a re-investigation of the nature of charge order and superconducting pairing in NbSe2 and related TMDCs.

引用

页数：6

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