Observation of a linearly dispersing collective mode in a quantum hall ferromagnet

I. B. Spielman, J. P. Eisenstein, L. N. Pfeiffer, K. W. West

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


Double-layer two-dimensional electron systems can exhibit a fascinating collective phase believed to display 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.

Original languageEnglish (US)
Pages (from-to)36803-1-36803-4
JournalPhysical review letters
Issue number3
StatePublished - Jul 16 2001
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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