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 language | English (US) |
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Article number | 240405 |
Journal | Physical review letters |
Volume | 105 |
Issue number | 24 |
DOIs | |
State | Published - Dec 10 2010 |
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)