Entanglement of fermions at quantum criticality |
| |
Authors: | H Johannesson D Larsson |
| |
Institution: | 1.Department of Physics,G?teborg University,G?teborg,Sweden;2.Fachbereich Physik,Philipps Universit?t Marburg,Marburg,Germany |
| |
Abstract: | The study of entanglement properties of quantum critical many-particle systems has become a subject of intense interest. While
the basic features of entanglement scaling for critical spin-1/2 systems (coupled qubits) are by now fairly well understood,
entanglement properties of critical fermions (or bosons) are less well studied. In an effort to contribute to this problem,
we have analyzed the single-site entanglement of a generic spin-1/2 lattice fermion system and found that (under certain provisos)
this measure can be used as a reliable marker to identify and partly characterize a quantum critical point. We illustrate
our findings by exact analytical results for the single-site entanglement at the magnetic and Mott-Hubbard transitions of
the 1D Hubbard model and at the Mott-Hubbard transitions of the 1D Hubbard model with long-range hopping.
The text was submitted by the authors in English. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|