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

Spielman, I. B. and Eisenstein, J. P. and Pfeiffer, L. N. and West, K. W. (2001) Observation of a linearly dispersing collective mode in a quantum Hall ferromagnet. Physical Review Letters, 87 (3). Art. No. 036803. ISSN 0031-9007. doi:10.1103/PhysRevLett.87.036803.

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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.

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Additional Information:© 2001 The American Physical Society. Received 21 December 2000; published 2 July 2001. It is a pleasure to acknowledge fruitful discussions with Steve Girvin, Allan MacDonald, Ady Stern, and Misha Fogler. This work was supported by the NSF under Grant No. DMR0070890 and the DOE under Grant No. DEFG03-99ER45766. One of us (I.B.S.) acknowledges support from the Department of Defense.
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Department of Energy (DOE)DE-FG03-99ER45766
Department of DefenseUNSPECIFIED
Issue or Number:3
Record Number:CaltechAUTHORS:SPIprl01
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:3028
Deposited By: Tony Diaz
Deposited On:11 May 2006
Last Modified:08 Nov 2021 19:52

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