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Field-induced polarization of Dirac valleys in bismuth

Title
Field-induced polarization of Dirac valleys in bismuth
Authors
Zhu Z.Collaudin A.Fauque B.Kang W.Behnia K.
Ewha Authors
강원
SCOPUS Author ID
강원scopus
Issue Date
2012
Journal Title
Nature Physics
ISSN
1745-2473JCR Link
Citation
vol. 8, no. 1, pp. 89 - 94
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
The electronic structure of certain crystal lattices can contain multiple degenerate 'valleys' for their charge carriers to occupy. This valley degree of freedom could be useful in the development of electronic devices. The principal challenge in the development of 'valleytronics' is to lift the valley degeneracy of charge carriers in a controlled way. Here we show that in semi-metallic bismuth the flow of Dirac fermions along the trigonal axis is extremely sensitive to the orientation of in-plane magnetic field. Thus, a rotatable magnetic field can be used as a valley valve to tune the contribution of each valley to the total conductivity. At high temperature and low magnetic field, bismuth's three valleys are interchangeable and the three-fold symmetry of its lattice is maintained. As the temperature is decreased or the magnetic field increased, this symmetry is spontaneously lost. This loss may be an experimental manifestation of the recently proposed valley-nematic Fermi liquid state.
DOI
10.1038/nphys2111
Appears in Collections:
자연과학대학 > 물리학전공 > Journal papers
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