Contrasting different scenarios for the quantum critical point |
| |
Authors: | V A Khodel J W Clark and M V Zverev |
| |
Institution: | 1.Russian Research Centre Kurchatov Institute,Moscow,Russia;2.McDonnell Center for the Space Science and Department of Physics,Washington University,Saint Louis,USA |
| |
Abstract: | Competing scenarios for quantum critical points (QCPs) of strongly interacting Fermi systems signaled by a divergent density
of states at zero temperature are contrasted. The conventional scenario, which enlists critical fluctuations of a collective
mode and attributes the divergence to a coincident vanishing of the quasi-particle strength z, is shown to be incompatible with identities arising from conservation laws prevailing in the fermionic medium. An alternative
scenario, in which the topology of the Fermi surface is altered at the QCP, is found to explain the non-Fermi-liquid thermodynamic
behavior observed experimentally in Yb-based compounds close to the QCP. It is suggested that combination of the topological
scenario with the theory of quantum phase transitions will provide a proper foundation for analysis of the extended QCP region. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|