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Condensed Matter Seminars

ics Condensed Matter
Thursday, April 10, 2014
3:30 PM
Physics Building, Room 204
Note special time.
Note special room.
Oded Agam [Host: Israel Klich]
Hebrew University
"The internal structure of a vortex and its exited states, in a two dimensional superfluid"
The motion of quantum vortex in a two-dimensional spinless superfluid is analyzed within Popov's hydrodynamic description. In the long healing length limit (where a large number of particles are inside the vortex core) the superfluid dynamics is determined by saddle points of Popov's action, which allows for weak solutions of the Gross-Pitaevskii equation. The resulting equations are solved for a vortex moving with respect to the superfluid. It is found that the vortex core is reconstructed in a non-analytic way. The response of the vortex to applied force produces an anomalously large dipole moment of the vortex and, as a result, the spectrum associated with the vortex motion exhibits narrow resonances lying within the phonon part of the spectrum, contrary to traditional view.

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