Observation of Dirac cone warping and chirality effects in silicene

Baojie Feng; Hui Li; Cheng Cheng Liu; Ting Na Shao; Peng Cheng; Yugui Yao; Sheng Meng; Lan Chen; Kehui Wu

doi:10.1021/nn403661h

Observation of Dirac cone warping and chirality effects in silicene

Baojie Feng, Hui Li, Cheng Cheng Liu, Ting Na Shao, Peng Cheng, Yugui Yao, Sheng Meng, Lan Chen^*, Kehui Wu

^*Corresponding author for this work

School of Physics

CAS - Institute of Physics

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

91 Citations (Scopus)

Abstract

We performed low temperature scanning tunneling microscopy (STM) and spectroscopy (STS) studies on the electronic properties of (√3 × √3)R30 phase of silicene on Ag(111) surface. We found the existence of Dirac Fermion chirality through the observation of -1.5 and -1.0 power law decay of quasiparticle interference (QPI) patterns. Moreover, in contrast to the trigonal warping of Dirac cone in graphene, we found that the Dirac cone of silicene is hexagonally warped, which is further confirmed by density functional calculations and explained by the unique superstructure of silicene. Our results demonstrate that the (√3 × √3)R30 phase is an ideal system to investigate the unique Dirac Fermion properties of silicene.

Original language	English
Pages (from-to)	9049-9054
Number of pages	6
Journal	ACS Nano
Volume	7
Issue number	10
DOIs	https://doi.org/10.1021/nn403661h
Publication status	Published - 22 Oct 2013

Keywords

Dirac fermion
chirality
molecular beam epitaxy
scanning tunneling microscopy
silicene
warping

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10.1021/nn403661h

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title = "Observation of Dirac cone warping and chirality effects in silicene",

abstract = "We performed low temperature scanning tunneling microscopy (STM) and spectroscopy (STS) studies on the electronic properties of (√3 × √3)R30 phase of silicene on Ag(111) surface. We found the existence of Dirac Fermion chirality through the observation of -1.5 and -1.0 power law decay of quasiparticle interference (QPI) patterns. Moreover, in contrast to the trigonal warping of Dirac cone in graphene, we found that the Dirac cone of silicene is hexagonally warped, which is further confirmed by density functional calculations and explained by the unique superstructure of silicene. Our results demonstrate that the (√3 × √3)R30 phase is an ideal system to investigate the unique Dirac Fermion properties of silicene.",

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T1 - Observation of Dirac cone warping and chirality effects in silicene

AU - Feng, Baojie

AU - Li, Hui

AU - Liu, Cheng Cheng

AU - Shao, Ting Na

AU - Cheng, Peng

AU - Yao, Yugui

AU - Meng, Sheng

AU - Chen, Lan

AU - Wu, Kehui

PY - 2013/10/22

Y1 - 2013/10/22

N2 - We performed low temperature scanning tunneling microscopy (STM) and spectroscopy (STS) studies on the electronic properties of (√3 × √3)R30 phase of silicene on Ag(111) surface. We found the existence of Dirac Fermion chirality through the observation of -1.5 and -1.0 power law decay of quasiparticle interference (QPI) patterns. Moreover, in contrast to the trigonal warping of Dirac cone in graphene, we found that the Dirac cone of silicene is hexagonally warped, which is further confirmed by density functional calculations and explained by the unique superstructure of silicene. Our results demonstrate that the (√3 × √3)R30 phase is an ideal system to investigate the unique Dirac Fermion properties of silicene.

AB - We performed low temperature scanning tunneling microscopy (STM) and spectroscopy (STS) studies on the electronic properties of (√3 × √3)R30 phase of silicene on Ag(111) surface. We found the existence of Dirac Fermion chirality through the observation of -1.5 and -1.0 power law decay of quasiparticle interference (QPI) patterns. Moreover, in contrast to the trigonal warping of Dirac cone in graphene, we found that the Dirac cone of silicene is hexagonally warped, which is further confirmed by density functional calculations and explained by the unique superstructure of silicene. Our results demonstrate that the (√3 × √3)R30 phase is an ideal system to investigate the unique Dirac Fermion properties of silicene.

KW - Dirac fermion

KW - chirality

KW - molecular beam epitaxy

KW - scanning tunneling microscopy

KW - silicene

KW - warping

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Observation of Dirac cone warping and chirality effects in silicene

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Keywords

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