Effect of subband Landau level coupling to the linearly dispersing collective mode in a quantum Hall ferromagnet
Abstract
In a recent experiment [Phys. Rev. Lett. 87, 036803 (2001)], Spielman et al. observed a linearly dispersing collective mode in a quantum Hall ferromagnet. While it qualitatively agrees with the Goldstone mode dispersion at small wave vector, the experimental mode velocity is slower than that calculated by previous theories by a factor of about 0.55. A quantitative correction may be achieved by taking the subband Landau-level coupling into account due to the finiteness of the layer thickness, which gives a better agreement with the experimental data. A method coupling the quantum fluctuation to the tunneling is briefly discussed.
- Publication:
-
Physical Review B
- Pub Date:
- September 2002
- DOI:
- 10.1103/PhysRevB.66.113309
- arXiv:
- arXiv:cond-mat/0205250
- Bibcode:
- 2002PhRvB..66k3309Y
- Keywords:
-
- 73.43.-f;
- 71.35.Lk;
- 73.21.-b;
- 73.40.Gk;
- Quantum Hall effects;
- Collective effects;
- Electron states and collective excitations in multilayers quantum wells mesoscopic and nanoscale systems;
- Tunneling;
- Condensed Matter - Mesoscale and Nanoscale Physics
- E-Print:
- 4 pages