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Two-dimensional electron gas in a periodic magnetic field |
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| Authors: | C. Lacroix M. Taillefumier V.K. Dugaev B. Canals |
| Affiliation: | a Institut Néel, CNRS-UJF, BP 166, 38042 Grenoble Cedex 9, France b Max-Planck-Institut für Mikrostruktur Physik, Weinberg 2, 06120 Halle, Germany c Department of Physics, Norwegian University of Science and Technology, N-7491, Trondheim, Norway d Department of Physics, Rzeszow University of Technology, Al. Powstancow Warszawy 6, 35-959 Rzeszow, Poland e Department of Physics and CFIF, Instituto Superior Tecnico, Universidade Tecnica de Lisboa, Avenue Rovisco Pais, 1049-001 Lisbon, Portugal f ESRF, BP 220, 38043 Grenoble Cedex, France |
| Abstract: | We study the energy spectrum and electronic properties of a two-dimensional (2D) spinless electron gas in a periodic magnetic field which has the symmetry of a triangular lattice. We show that the energy bands depend strongly on the value of the magnetic field. For large field the low-energy electrons are localized on closed rings where the magnetic field vanishes. This results in the appearance of persistent currents around these rings. We also calculate the intrinsic Hall conductivity, which is quantized when the Fermi level is in a gap. |
| Keywords: | 73.21.&minus b 75.30.Jt 75.47.&minus m 73.23.Ra |
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