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DOI: 10.1209/epl/i1999-00172-5


Europhys. Lett, 45 (3), pp. 361-367 (1999)

Quantum Hall effect anomaly and collective modes
in the magnetic-field-induced spin-density-wave
phases of quasi-one-dimensional conductors

N. Dupuis and V. M. Yakovenko

Department of Physics and Center for Superconductivity Research
University of Maryland - College Park, MD 20742-4111, USA

(received 17 September 1998; accepted in final form 23 November 1998)

PACS. 72.15Nj - Collective modes (e.g., in one-dimensional conductors).
PACS. 73.40Hm - Quantum Hall effect (integer and fractional).
PACS. 75.30Fv - Spin-density waves.

Abstract:

We study the collective modes in the magnetic-field-induced spin-density-wave (FISDW) phases experimentally observed in organic conductors of the Bechgaard salts family. In phases that exhibit a sign reversal of the quantum Hall effect (Ribault anomaly), the coexistence of two spin-density waves gives rise to additional long-wavelength collective modes besides the Goldstone modes due to spontaneous translation and rotation symmetry breaking. These modes strongly affect the charge and spin response functions. We discuss some experimental consequences for the Bechgaard salts.

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