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Chiral Charge-Density Waves

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Title: Chiral Charge-Density Waves
Authors: Ishioka, J. Browse this author
Liu, Y. H. Browse this author
Shimatake, K. Browse this author
Kurosawa, T. Browse this author
Ichimura, K. Browse this author
Toda, Y. Browse this author
Oda, M. Browse this author
Tanda, S. Browse this author
Issue Date: 22-Oct-2010
Publisher: American Physical Society
Journal Title: Physical Review Letters
Volume: 105
Issue: 17
Start Page: 176401
Publisher DOI: 10.1103/PhysRevLett.105.176401
PMID: 21231061
Abstract: We discovered the chirality of charge-density waves (CDW) in 1T-TiSe2 by using STM and time-domain optical polarimetry. We found that the CDW intensity becomes Ia1:Ia2:Ia3 = 1:0.7 ± 0.1:0.5 ± 0.1, where Iai (i = 1, 2, 3) is the amplitude of the tunneling current contributed by the CDWs. There were two states, in which the three intensity peaks of the CDW decrease clockwise and anticlockwise. The chirality in CDW results in the threefold symmetry breaking. Macroscopically, twofold symmetry was indeed observed in optical measurement. We propose the new generalized CDW chirality H_[CDW] = q1・(q2 x q3), where qi are the CDW q vectors, which is independent of the symmetry of components. The nonzero H_[CDW] - the triple-q vectors do not exist in an identical plane in the reciprocal space - should induce a real-space chirality in CDW system.
Rights: © 2010 The 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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