Few-body collective excitations beyond Kohn's theorem in quantum Hall systems
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DOI: 10.1103/physrevb.95.035150
Abstract: A relative coordinate breathing mode in the quantum Hall system is predicted to exist with different behavior under either Coulomb or dipole-dipole interactions. While Kohn's theorem predicts that any relative coordinate interaction will fail to… read more here.
Keywords: collective excitations; hall; quantum hall; kohn theorem ... See more keywords
Failure of Kohn's theorem and the apparent failure of the f -sum rule in intrinsic Dirac-Weyl materials in the presence of a filled Fermi sea
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DOI: 10.1103/physrevb.98.155112
Abstract: Kohn's theorem and the $f$-sum rule are powerful theorems, the first applying to translationally invariant single-band electronic systems with parabolic electronic dispersion relations and the second applying to materials in general, that impose restrictions on… read more here.
Keywords: sum rule; kohn theorem; failure; intrinsic dirac ... See more keywords