Scanning tunneling spectroscopy studies of angle-dependent van Hove singularities on twisted graphite surface layer

Xin Zhang; Hong Luo

doi:10.1063/1.4839419

Scanning tunneling spectroscopy studies of angle-dependent van Hove singularities on twisted graphite surface layer

Xin Zhang
, Hong Luo

Physics

SUNY Buffalo

Research output: Contribution to journal › Article › peer-review

18 Scopus citations

Abstract

Slightly misoriented surface graphene layer on highly ordered pyrolytic graphite (HOPG) can result in Moiré patterns (MP). Two van Hove singularity (VHS) peaks in the density of states are observed with scanning tunneling spectroscopy on a series of the MPs with different periods on HOPG surface, flanking the Fermi energy. The energy difference between the two VHS peaks (ΔE_VHS) is linearly proportional to the sine of interlayer rotation angle. A similar relation between ΔE_VHS and MP periods has recently been reported on twisted graphene layers. Compared to the case of twisted graphene layers, the Fermi velocity of MPs on a HOPG surface is found to be larger, and the interlayer hopping is enhanced.

Original language	English
Article number	231602
Journal	Applied Physics Letters
Volume	103
Issue number	23
DOIs	https://doi.org/10.1063/1.4839419
State	Published - Dec 2 2013

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title = "Scanning tunneling spectroscopy studies of angle-dependent van Hove singularities on twisted graphite surface layer",

abstract = "Slightly misoriented surface graphene layer on highly ordered pyrolytic graphite (HOPG) can result in Moir{\'e} patterns (MP). Two van Hove singularity (VHS) peaks in the density of states are observed with scanning tunneling spectroscopy on a series of the MPs with different periods on HOPG surface, flanking the Fermi energy. The energy difference between the two VHS peaks (ΔEVHS) is linearly proportional to the sine of interlayer rotation angle. A similar relation between ΔEVHS and MP periods has recently been reported on twisted graphene layers. Compared to the case of twisted graphene layers, the Fermi velocity of MPs on a HOPG surface is found to be larger, and the interlayer hopping is enhanced.",

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AU - Luo, Hong

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N2 - Slightly misoriented surface graphene layer on highly ordered pyrolytic graphite (HOPG) can result in Moiré patterns (MP). Two van Hove singularity (VHS) peaks in the density of states are observed with scanning tunneling spectroscopy on a series of the MPs with different periods on HOPG surface, flanking the Fermi energy. The energy difference between the two VHS peaks (ΔEVHS) is linearly proportional to the sine of interlayer rotation angle. A similar relation between ΔEVHS and MP periods has recently been reported on twisted graphene layers. Compared to the case of twisted graphene layers, the Fermi velocity of MPs on a HOPG surface is found to be larger, and the interlayer hopping is enhanced.

AB - Slightly misoriented surface graphene layer on highly ordered pyrolytic graphite (HOPG) can result in Moiré patterns (MP). Two van Hove singularity (VHS) peaks in the density of states are observed with scanning tunneling spectroscopy on a series of the MPs with different periods on HOPG surface, flanking the Fermi energy. The energy difference between the two VHS peaks (ΔEVHS) is linearly proportional to the sine of interlayer rotation angle. A similar relation between ΔEVHS and MP periods has recently been reported on twisted graphene layers. Compared to the case of twisted graphene layers, the Fermi velocity of MPs on a HOPG surface is found to be larger, and the interlayer hopping is enhanced.

UR - https://www.scopus.com/pages/publications/84889835792

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JO - Applied Physics Letters

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ER -

Scanning tunneling spectroscopy studies of angle-dependent van Hove singularities on twisted graphite surface layer

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