报告题目: |
Exotic superfluidity of spin imbalanced fermions: from three to one dimension |
报告人: |
Vincent Liu |
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教授 美国Pittsburgh大学
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报告时间: |
2010-06-17 10:30 |
报告地点: |
物理系三楼报告厅 |
主办单位: |
物理系 |
简介: |
摘要: A number of condensed matter concepts and models have been
explored in cold atomic systems, which provide a highly controllable
environment. One such system is spin-imbalanced fermions. In this
talk, I will report some of its intriguing properties. In 3D, the
combined effect of Fermi surface mismatch and mass imbalance creates
the possibility of discovering a new kind of pairing state---breached
pair superfluidity (BP), conceptually different than the well-known
BCS and Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) phases. Novel unique
features as well as some numerical evidences of the state will be
discussed. In 1D, the effect of spin imbalance is also
remarkable. Spin-charge separation previously known as the
characteristic of electrons in one-dimensional solids does not
occur. A first correct effective model of the Tomonaga-Luttinger
liquid type is constructed for arbitrary spin polarization from Bethe
ansatz and conformal field theory. Dimensional crossover is then
analyzed by renormalization group. Towards exact solutions, I will
report a breakthrough in simplifying coupled thermodynamic Bethe
ansatz (TBA) integral equations, whose physics is exact but
notoriously difficult to understand. The simplified TBA equations
provide a precise understanding of the 1D system at strong attractive
interaction and relatively low temperature and yet are simple enough
to be mastered by non-experts comparing with experiments.
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