Observation of the ground-state geometric phase in a Heisenberg XY model.
Phys Rev Lett
; 105(24): 240405, 2010 Dec 10.
Article
en En
| MEDLINE
| ID: mdl-21231514
ABSTRACT
Geometric phases play a central role in a variety of quantum phenomena, especially in condensed matter physics. Recently, it was shown that this fundamental concept exhibits a connection to quantum phase transitions where the system undergoes a qualitative change in the ground state when a control parameter in its Hamiltonian is varied. Here we report the first experimental study using the geometric phase as a topological test of quantum transitions of the ground state in a Heisenberg XY spin model. Using NMR interferometry, we measure the geometric phase for different adiabatic circuits that do not pass through points of degeneracy.
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Banco de datos:
MEDLINE
Tipo de estudio:
Qualitative_research
Idioma:
En
Revista:
Phys Rev Lett
Año:
2010
Tipo del documento:
Article