Anisotropic band splitting in monolayer NbSe2: implications for superconductivity and charge density wave View Full Text


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Article Info

DATE

2018-05-03

AUTHORS

Yuki Nakata, Katsuaki Sugawara, Satoru Ichinokura, Yoshinori Okada, Taro Hitosugi, Takashi Koretsune, Keiji Ueno, Shuji Hasegawa, Takashi Takahashi, Takafumi Sato

ABSTRACT

Realization of unconventional physical properties in two-dimensional (2D) transition-metal dichalcogenides (TMDs) is currently one of the key challenges in condensed-matter systems. However, the electronic properties of 2D TMDs remain largely unexplored compared to those of their bulk counterparts. Here, we report the fabrication of a high-quality monolayer NbSe2 film with a trigonal prismatic structure by molecular beam epitaxy, and the study of its electronic properties by scanning tunneling microscopy, angle-resolved photoemission spectroscopy, and electrical transport measurements, together with first-principles band-structure calculations. In addition to a charge density wave (CDW) with 3 × 3 periodicity and superconductivity below 1.5 K, we observed sizable (~0.1 eV) band splitting along the Γ-K cut in the Brillouin zone due to inversion symmetry breaking in the monolayer crystal. This splitting is highly anisotropic in k space, leading to a spin-split van-Hove singularity in the band structure. The present results suggest the importance of spin–orbit coupling and symmetry breaking for unconventional superconductivity and CDW properties in monolayer TMDs. More... »

PAGES

12

References to SciGraph publications

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  • 2015-11-02. Characterization of collective ground states in single-layer NbSe2 in NATURE PHYSICS
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    41 challenges
    42 charge density wave
    43 condensed-matter systems
    44 counterparts
    45 coupling
    46 crystals
    47 cut
    48 density wave
    49 dichalcogenides
    50 electrical transport measurements
    51 electronic properties
    52 epitaxy
    53 fabrication
    54 films
    55 first-principles band-structure calculations
    56 high-quality monolayer NbSe2 film
    57 implications
    58 importance
    59 inversion symmetry
    60 key challenges
    61 measurements
    62 microscopy
    63 molecular beam epitaxy
    64 monolayer NbSe2
    65 monolayer NbSe2 film
    66 monolayer TMDCs
    67 monolayer crystals
    68 periodicity
    69 photoemission spectroscopy
    70 physical properties
    71 present results
    72 prismatic structure
    73 properties
    74 realization
    75 results
    76 singularity
    77 sizable (~0.1 eV) band splitting
    78 space
    79 spectroscopy
    80 spin-orbit coupling
    81 spin-split van-Hove singularity
    82 splitting
    83 structure
    84 study
    85 superconductivity
    86 symmetry
    87 system
    88 transition-metal dichalcogenides
    89 transport measurements
    90 trigonal prismatic structure
    91 tunneling microscopy
    92 two-dimensional transition-metal dichalcogenides
    93 unconventional physical properties
    94 unconventional superconductivity
    95 van-Hove singularity
    96 waves
    97 zone
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