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Charge-parity symmetry observed through Friedel oscillations in chiral charge-density waves

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Title: Charge-parity symmetry observed through Friedel oscillations in chiral charge-density waves
Authors: Ishioka, J. Browse this author
Fujii, T. Browse this author
Katono, K. Browse this author
Ichimura, K. Browse this author
Kurosawa, T. Browse this author
Oda, M. Browse this author
Tanda, S. Browse this author
Issue Date: 15-Dec-2011
Publisher: American Physical Society
Journal Title: Physical Review B
Volume: 84
Issue: 24
Start Page: 245125
Publisher DOI: 10.1103/PhysRevB.84.245125
Abstract: We discovered a chiral behavior of Friedel oscillations (FOs), which have both triangular symmetry and inverse chirality from chiral charge-density waves (CDWs) in 1T-TiSe2 by using scanning tunneling microscopy (STM). Surprisingly, the existence of FOs with the opposite chirality to the underlying CDWs suggests that the excess electron induced by impurity reduces the local helicity of CDWs without CDW breaking. This FOs can be explained with a two-branch model with different chiralities, which permits excitation from one branch to another, that is, Dirac-type dispersion. Moreover, we found two states that correspond to electron addition and electron removal. In terms of the chirality of electrons, these two states are the same. This result provides an evidence for the charge-parity (CP) symmetry conservation in CDW systems.
Rights: ©2011 American Physical Society
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 丹田 聡

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