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.
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收藏
页数:6
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