Quantum Hall effect anomaly and collective modes in the magnetic-field–induced spin-density-wave phases of quasi–one-dimensional conductors
Department of Physics and Center for Superconductivity Research
University of Maryland - College Park, MD 20742-4111, USA
Accepted: 23 November 1998
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.
PACS: 72.15.Nj – Collective modes (e.g., in one-dimensional conductors) / 73.40.Hm – Quantum Hall effect (integer and fractional) / 75.30.Fv – Spin-density waves
© EDP Sciences, 1999