Upload
joan-mcdonald
View
41
Download
3
Tags:
Embed Size (px)
DESCRIPTION
Interference of Two Molecular Bose-Einstein Condensates. Christoph Kohstall Innsbruck FerMix, June 2009. Fer ( Mix ) -Team. Johannes Hecker Denschlag. Christoph Kohstall. Rudi Grimm. Leonid Sidorenkov. Edmundo Sánchez Guajardo. Stefan Riedl. - PowerPoint PPT Presentation
Citation preview
Interference of Two Molecular Bose-Einstein Condensates
Christoph Kohstall
Innsbruck
FerMix, June 2009
Joha
nnes
Hecke
r Den
schl
ag
Christ
oph
Kohst
all
Stefa
n Rie
dlRud
i Grim
mEdm
undo
Sánch
ez G
uaja
rdo
Leon
id S
idor
enko
vFer(Mix)-Team
Interference of atomic Bose condensates
A powerful tool to study Bose gases
Interference meets Fermi gases
Interesting challenges
Fermions form bosonic pairs
strong interaction
Interference of two independent BECs
Andrews et al., Science 275, 637 (1997)
Interference of atomic Bose condensates…
a powerful tool to study Bose gases
Now interference meets Fermi gases
highlights and
interesting challenges
Interference of atom lasers
coherence length
Bloch et al., Nature 403, 166 (2000)
Vortex in BEC
phase jump
Inouye et al., Phys. Rev. Lett. 87, 080402 (2001)
2D
BKT transition
P. Krüger et al., Phys. Rev. Lett. 99, 040402 (2007)
1D
Luttinger liquid
Hofferberth et al., Nature Physics 4,489 (2008)
bosonic pairsof fermions
strong interaction
from atoms to molecules
TOF-Images
TOF=0.4 ms
4 ms
8 ms
12 ms
14 ms
B = 700 G
visibility ~25%
zx
0
80 pixel
250 µm
visibility fringe spacingphase
z
Procedure
AOM CCD
lens
trappingbeam
coils for mag. Feshbach field
Li
beam waist 54 µmωy 2π*20Hzωx , ωz 2π*150Hzmag. field 700 GN↑,↓ 200 0001/kFa 3
separation 64 µm
AOM CCD
lens
trappingbeam
coils for mag. Feshbach field
Li
beam waist 54 µmωy 2π*20Hzωx , ωz 2π*150Hzmag. field 700 GN↑,↓ 200 0001/kFa 3
separation 64 µm
in situ
TOF=0 ms
in expansion
TOF = 14 ms
Expansion
clouds clouds
no slicing necessary
mag
nify
ing
glas
strap
posi
tion
trap
position
trap
posi
tion
trap
position
1/kFa (in situ) 4 1 0
detection efficiency
depletion of BEC
# of collisions
mean field potential
pair breaking
many-body pairs
detection
7% 17% 34% not valid
Ekin<Emfpartial reflection
Ekin>Epairing
no survival
0.1 1 30
pote
ntia
lDepleted part has no common phase
1/kFa (in situ) 4 1 0
detection efficiency
depletion of BEC
# of collisions
mean field potential
pair breaking
many-body pairs
detection
7% 17% 34% not valid
Ekin<Emfpartial reflection
Ekin>Epairing
no survival
pote
ntia
l 0.1 1 30