Microscopic model of quasiparticle wave packets in superfluids, superconductors, and paired hall states

S. A. Parameswaran, S. A. Kivelson, R. Shankar, Shivaji Lal Sondhi, B. Z. Spivak

Research output: Contribution to journalArticle

5 Scopus citations

Abstract

We study the structure of Bogoliubov quasiparticles, bogolons, the fermionic excitations of paired superfluids that arise from fermion (BCS) pairing, including neutral superfluids, superconductors, and paired quantum Hall states. The naive construction of a stationary quasiparticle in which the deformation of the pair field is neglected leads to a contradiction: it carries a net electrical current even though it does not move. However, treating the pair field self-consistently resolves this problem: in a neutral superfluid, a dipolar current pattern is associated with the quasiparticle for which the total current vanishes. When Maxwell electrodynamics is included, as appropriate to a superconductor, this pattern is confined over a penetration depth. For paired quantum Hall states of composite fermions, the Maxwell term is replaced by a Chern-Simons term, which leads to a dipolar charge distribution and consequently to a dipolar current pattern.

Original languageEnglish (US)
Article number237004
JournalPhysical review letters
Volume109
Issue number23
DOIs
StatePublished - Dec 5 2012

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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