Observation of the ground-state geometric phase in a heisenberg XY model

Xinhua Peng, Sanfeng Wu, Jun Li, Dieter Suter, Jiangfeng Du

Research output: Contribution to journalArticle

36 Scopus citations

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.

Original languageEnglish (US)
Article number240405
JournalPhysical review letters
Volume105
Issue number24
DOIs
StatePublished - Dec 10 2010
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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