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Article overview
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Electronic phase separation in topological surface states of rhombohedral graphite | Yanmeng Shi
; Shuigang Xu
; Yaping Yang
; Sergey Slizovskiy
; Sergei V. Morozov
; Seok-Kyun Son
; Servet Ozdemir
; Ciaran Mullan
; Julien Barrier
; Jun Yin
; Alexei I. Berdyugin
; Benjamin A. Piot
; Takashi Taniguchi
; Kenji Watanabe
; Vladimir I. Fal'ko
; Kostya S. Novoselov
; A. K. Geim
; Artem Mishchenko
; | Date: |
11 Nov 2019 | Abstract: | Of the two stable forms of graphite, hexagonal (HG) and rhombohedral (RG),
the former is more common and has been studied extensively. RG is less stable,
which so far precluded its detailed investigation, despite many theoretical
predictions about the abundance of exotic interaction-induced physics. Advances
in van der Waals heterostructure technology have now allowed us to make
high-quality RG films up to 50 graphene layers thick and study their transport
properties. We find that the bulk electronic states in such RG are gapped and,
at low temperatures, electron transport is dominated by surface states. Because
of topological protection, the surface states are robust and of high quality,
allowing the observation of the quantum Hall effect, where RG exhibits phase
transitions between gapless semimetallic phase and gapped quantum spin Hall
phase with giant Berry curvature. An energy gap can also be opened in the
surface states by breaking their inversion symmetry via applying a
perpendicular electric field. Moreover, in RG films thinner than 4 nm, a gap is
present even without an external electric field. This spontaneous gap opening
shows pronounced hysteresis and other signatures characteristic of electronic
phase separation, which we attribute to emergence of strongly-correlated
electronic surface states. | Source: | arXiv, 1911.4565 | Services: | Forum | Review | PDF | Favorites |
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