ar X iv : 1 00 1 . 31 96 v 1 [ co nd - m at . o th er ] 1 9 Ja n 20 10 Chiral charge - density - waves
نویسندگان
چکیده
We discovered the chirality of charge density waves (CDW) in 1T-TiSe2 by using scanning tunnelling microscopy (STM) and optical ellipsometry. 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 tunnelling current contributed by the CDWs. There were two states, in which the three intensity peaks of the CDW decrease clockwise and anticlockwise when we index each nesting vector in order of intensity in the Fourier transformation of the STM images. The chirality in CDW results in the three-fold symmetry breaking. Macroscopically, two-fold symmetry was indeed observed in optical measurement. We propose the new generalized CDW chirality HCDW ≡ q1 · (q2 × q3), where qi are the nesting vectors, which is independent of the symmetry of components. The nonzero HCDW the triple-q vectors do not exist in an identical plane in the reciprocal space should induce a real-space chirality in CDW system. PACS numbers: 71.45.Lr, 68.37.Ef, 72.80.Ga, 73.22.Gk, 78.47.J-
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