Inversion Symmetry and Wave-Function Nodal Lines of Dirac Electrons in Organic Conductor \alpha-(BEDT-TTF)
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概要
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By examining the organic conductor \alpha-(BEDT-TTF)<inf>2</inf>I<inf>3</inf>, which is described by a nearest neighbor tight-binding model, it is shown that, owing to inversion symmetry, each component of a wave function (WF) exhibits nodal lines (NLs) (i.e., lines in the two-dimensional Brillouin zone where the WF component vanishes). In the absence of any band crossing, each NL connects two time reversal invariant momenta (TRIMs) as partners. In the presence of a pair of Dirac points (band crossing), there are NLs that connect the pair of Dirac points via a TRIM without a partner. This second kind of NL leads to a discontinuous sign change for nonvanishing components of the WF. Such a property is the origin of the \pm\pi Berry phase accumulated on a contour integral encircling one Dirac point. The results are exemplified by the numerical calculation of WF components for the above conductor with a 3/4 filled band.
- 2013-12-15
著者
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Suzumura Yoshikazu
Department Of Physics Faculty Of Science Tohoku University
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Piéchon Frédéric
Laboratoire de Physique des Solides, CNRS UMR 8502, Universite Paris-Sud, F-91405 Orsay Cedex, France
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Piéchon Frédéric
Laboratoire de Physique des Solides, CNRS UMR 8502, Université Paris-Sud, F-91405 Orsay Cedex, France
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