JQI Seminar 5/7/12 - Part 1
Автор: JQInews
Загружено: 2012-05-11
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Speaker: Wolfgang Ketterle
Title: Ultracold fermions with strong interactions
Abstract: We have studied ultracold fermions with both attractive and repulsive interactions. Fermions with attractive interactions undergo a phase transition to superfluidity. For repulsive interactions, a transition to a ferromagnetic phase has been predicted -- the so-called Stoner model for itinerant ferromagnetism. However, any strong short-range repulsive potential necessarily features a weakly bound paired state. Our experiments show that the ferromagnetic transition does not take place, but is rather preempted by rapid pair formation. Our experimental study can be regarded as a quantum simulation of a Hamiltonian, for which even the qualitative phase diagram cannot be reliably obtained by computational methods.
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