Imbalanced Fermi Gases - PowerPoint PPT Presentation

1 / 20
About This Presentation
Title:

Imbalanced Fermi Gases

Description:

Yean-an Liao. Randy Hulet. Imbalanced Fermi Mixture (I) Atomic Fermi mixtures in an optical trap: ... Uses rotation to create vortices and measures density ... – PowerPoint PPT presentation

Number of Views:85
Avg rating:3.0/5.0
Slides: 21
Provided by: htcs
Category:
Tags: fermi | gases | imbalanced | yean

less

Transcript and Presenter's Notes

Title: Imbalanced Fermi Gases


1
Imbalanced Fermi Gases
Masud Haque Koos Gubbels Mathijs Romans Arnaud
Koetsier Henk Stoof Guthrie Partridge Wenhui
Li Yean-an Liao Randy Hulet
Utrecht University
2
Imbalanced Fermi Mixture (I)
  • Atomic Fermi mixtures in an optical trap

3
Imbalanced Fermi Mixture (II)
  • Up to recently only . However, the
    most recent experiments do not have this
    condition any longer. This means that

4
MIT Science experiment (I)
  • Uses rotation to create vortices and measures
    density profiles after expansion and magnetic
    field sweep

M.W. Zwierlein et al., Science 311, 492 (2006).
5
MIT Science experiment (II)
M.W. Zwierlein et al., Science 311, 492 (2006).
6
Rice Science experiment (I)
  • Uses in-situ imaging

G.B. Partridge et al., Science 311, 503 (2006).
7
Rice Science experiment (II)
G.B. Partridge et al., Science 311, 503 (2006).
8
Zero Temperature Theory (I)
  • Using the BCS ansatz we find for the homogeneous
    case

9
Zero Temperature Theory (II)
  • Local-density theory and BCS ansatz

10
Zero Temperature Theory (III)
  • Comparison with Rice experiment

M. Haque and H.T.C. Stoof, PRA 74, 011602(R)
(2006). See also F. Chevy, PRL 96, 130401
(2006) and T.N. De Silva and E.J. Mueller, PRA
73, 051602(R) (2006).
11
MIT Nature experiment
  • Measures density
  • profiles after
  • expansion

M.W. Zwierlein et al., Nature 442, 54 (2006).
12
Nonzero Temperature Theory (I)
  • Proposed (universal) phase diagram

K.B. Gubbels et al., PRL 97, 210402 (2006).
13
Nonzero Temperature Theory (II)
  • In-situ density profiles are again calculated in
    local-density approximation

K.B. Gubbels et al., PRL 97, 210402 (2006).
14
Nonzero Temperature Theory (III)
  • Comparison with MIT experiment

K.B. Gubbels et al., PRL 97, 210402 (2006).
15
Rice PRL experiment (I)
  • Uses in-situ imaging

G.B. Partridge et al., PRL 97, 190407 (2006).
16
Rice PRL experiment (II)
  • Comparison between theory and experiment

G.B. Partridge et al., PRL 97, 190407 (2006).
17
Rice PRL experiment (III)
  • Comparison between low and high
    temperature

G.B. Partridge et al., PRL 97, 190407 (2006).
18
Rice PRL experiment (IV)
  • Superfluid core shape

19
Conclusions and Outlook
  • Our (universal) phase diagram is able to explain
    the contradictions between the MIT and Rice
    experiments.
  • Remaining problem is the absolute temperature
    scale. Requires inclusion of fluctuations into
    the theory. We are working on this!
  • Imbalanced Fermi gases in optical lattices and
    neutron stars!

20
The Quantum Fluids and Solids Group
  • Students Koos Gubbels
  • Mathijs Romans
  • Arnoud Koetsier
  • Postdocs Masud Haque (Dresden)
  • Pietro Massignan
  • Staff Henk Stoof
  • Special thanks
  • Randy Hulet
Write a Comment
User Comments (0)
About PowerShow.com