Observation of a Linearly Dispersing Collective Mode in a Quantum Hall Ferromagnet

Details Observation of a Linearly Dispersing Collective Mode in a Quantum Hall Ferromagnet Observation of a Linearly Dispersing Collective Mode in a Quantum Hall Ferromagnet

2000-12-06

arxiv.org/abs/cond-mat/0012094v3

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 4 figures; accepted for publication in PRL. Contains new data, a new figure, and a new title

Scientific paper

10.1103/PhysRevLett.87.036803

Double layer two-dimensional electron systems can exhibit a fascinating collective phase believed to exhibit both quantum ferromagnetism and excitonic superfluidity. This unusual phase has recently been found to exhibit tunneling phenomena reminiscent of the Josephson effect. A key element of the theoretical understanding of this bizarre quantum fluid is the existence of linearly dispersing Goldstone collective modes. Using the method of tunneling spectroscopy, we have demonstrated the existence of these modes. We find the measured velocity to be in reasonable agreement with theoretical estimates.

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