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 Quantum critical dynamics of the two-dimensional Bose gas


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The dilute, two-dimensional Bose gas exhibits a novel regime of relaxational dynamics in the regime k B T |\mu| where T is the absolute temperature and \mu is the chemical potential. This may also be interpreted as the quantum criticality of the zero density quantum critical point at \mu=0. We present a theory for this dynamics, to leading order in 1-\ln \Lambda- k B T, where \Lambda is a high energy cutoff. Although pairwise interactions between the bosons are weak at low energy scales, the collective dynamics are strongly coupled even when \ln \Lambda-T is large. We argue that the strong-coupling effects can be isolated in an effective classical model, which is then solved numerically. Applications to experiments on the gap-closing transition of spin gap antiferromagnets in an applied field are presented.



Autor: Subir Sachdev; Emily R. Dunkel

Fuente: https://archive.org/







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