| DATE: |
2009-12-21 13:30 - 14:30 |
| PLACE: |
Kenkyu Honkan 3F Rm. 322 |
| TITLE: |
Universal few-body and many-body physics in mixed dimensions |
| CONTACT: |
YASUI Shigehiro / yasuis AT post.kek.jp |
| SPEAKER: |
Yosuke Nishida (MIT) |
| LANGUAGE: |
Japanese |
| ABSTRACT: |
After a very brief introduction to the recent achievement in ultracold
atom experiments
(BCS-BEC crossover, unitary Fermi gas, ...), we propose a two-species Fermi gas
in which one species (e.g. 40K) is confined in 2D planes or 1D lines
and interacts
with the other species (e.g. 6Li) in the 3D space by a tunable
short-range interaction.
We show that such a Fermi gas in mixed dimensions has interesting physics
both in few-body and many-body physics.
In few-body physics, the confinement acting only on one species can
induce a new type of resonances both in 2-body and 3-body scatterings.
In particular, the 3-body resonances are due to the emergence of the
Efimov effect
that does not exist in the 40K-6Li mixture in a free space.
In many-body physics, the system has a very rich phase diagram in the plane
of the effective scattering length and the interlayer separation.
Resulting phases include an interlayer s-wave pairing, an intralayer
p-wave pairing,
a dimer Bose-Einstein condensation, and a Fermi gas of Efimov-like trimers.
Our system in a certain limit can be thought of as a nonrelativistic defect CFT
and thus string theorists may want to consider its gravity dual. |
|
