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cond-mat1993★ 42 cited
Dispersion Law of Edge Waves in the Quantum Hall Effect
S. Giovanazzi, L. Pitaevskii, S. Stringari
We present a microscopic description of edge excitations in the quantum Hall effect which is analogous to Feynman's theory of superfluids. Analytic expressions for the excitation e…
cond-mat1993
Sum Rules and Bose-Einstein Condensation
S. Stringari
Various sum rules accounting for the coupling between density and particle excitations and emphasizing in an explicit way the role of the Bose-Einstein condensation are discussed.…
cond-mat1993★ 31 cited
Spin Excitations and Sum Rules in the Heisenberg Antiferromagnet
S. Stringari
Various bounds for the energy of collective excitations in the Heisenberg antiferromagnet are presented and discussed using the formalism of sum rules. We show that the Feynman app…