Quantum phase transitions and conserved charges |
| |
Authors: | Subir Sachdev |
| |
Affiliation: | (1) Departments of Physics and Applied Physics, Yale University, P.O. Box 6666, 06511 New Haven, CT, USA;(2) Laboratoire de Physique Théorique et Hautes Énergies, Université Paris VII, F-75251 Paris Cedex 05, France |
| |
Abstract: | The constraints on the scaling properties of conserved charge densities in the vicinity of a zero temperature (T), second-order quantum phase transition are studied. We introduce a generalized Wilson ratio, characterizing the nonlinear response to an external field,H, coupling to any conserved charge, and argue that it is a completely universal function ofH/T: this is illustrated by computations on model systems. We also note implications for transitions where the order parameter is a conserved charge (as in aT=0 ferromagnet-paramagnet transition). |
| |
Keywords: | 05.30 75.10.J 75.50.E |
本文献已被 SpringerLink 等数据库收录! |
|