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- W3129431323 abstract "We study generalized spin waves in graphene under a strong magnetic field when the Landau-level filling factor is $nu=pm 1$. In this case, the ground state is a particular SU(4) quantum Hall ferromagnet, in which not only the physical spin is fully polarized but also the pseudo-spin associated with the valley degree of freedom. The nature of the ground state and the spin-valley polarization depend on explicit symmetry breaking terms that are also reflected in the generalised spin-wave spectrum. In addition to pure spin waves, one encounters valley-pseudo-spin waves as well as more exotic entanglement waves that have a mixed spin-valley character. Most saliently, the SU(4) symmetry-breaking terms do not only yield gaps in the spectra, but under certain circumstances, namely in the case of residual ground-state symmetries, render the originally quadratic (in the wave vector) spin-wave dispersion linear." @default.
- W3129431323 created "2021-03-01" @default.
- W3129431323 creator A5008000634 @default.
- W3129431323 creator A5069171021 @default.
- W3129431323 date "2021-05-12" @default.
- W3129431323 modified "2023-10-10" @default.
- W3129431323 title "SU(4) spin waves in the <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mrow><mml:mi>ν</mml:mi><mml:mo>=</mml:mo><mml:mo>±</mml:mo><mml:mn>1</mml:mn></mml:mrow></mml:math> quantum Hall ferromagnet in graphene" @default.
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- W3129431323 doi "https://doi.org/10.1103/physrevb.103.195413" @default.
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