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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.

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Interference of two molecular bose einstein condensates

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


Analysing different system sizes, we observe the crossover from thermal to quantum noise, reflected

in a characteristic change in the distribution functions from poissonian to Gumbel type, in excellent agreement with theoretical

predictions on the basis of the Luttinger-liquid formalism. We present the first experimental observation of quasi-long-range order

in one-dimensional atomic condensates,

  • Interference of atomic Bose condensates

  • A powerful tool to study Bose gases

  • Interference meets Fermi gases

  • Interesting challenges

Fermions form

bosonic pairs

strong

interaction


Analysing different system sizes, we observe the crossover from thermal to quantum noise, reflected

in a characteristic change in the distribution functions from poissonian to Gumbel type, in excellent agreement with theoretical

predictions on the basis of the Luttinger-liquid formalism. We present the first experimental observation of quasi-long-range order

in one-dimensional atomic condensates,

  • Interference of atomic Bose condensates…

  • a powerful tool to study Bose gases

  • Now interference meets Fermi gases

  • highlights and

  • interesting challenges

from atoms

to molecules

bosonic pairs

of fermions

strong

interaction


Fermionic lithium our workhorse

BEC from thermal to quantum noise, reflected

BCS

molecules

many-body pairs

Fermionic lithium – our workhorse

Let‘s open the door!


Tof images
TOF-Images from thermal to quantum noise, reflected

TOF=0.4 ms

B = 700 G

visibility ~25%

4 ms

8 ms

12 ms

14 ms

x

z

80 pixel

250 µm

0

z

phase

visibility

fringe spacing


Procedure

coils for mag. Feshbach field from thermal to quantum noise, reflected

trapping

beam

beam waist 54 µm

ωy 2π*20Hz

ωx , ωz 2π*150Hz

mag. field 700 G

N↑,↓ 200 000

1/kFa 3

separation 64 µm

lens

Li

create split overlap observe

CCD

AOM

z

x

split create overlap observe

z

Procedure

y

x

confinement

z

y

x


Expansion
Expansion from thermal to quantum noise, reflected

coils for mag. Feshbach field

trapping

beam

beam waist 54 µm

ωy 2π*20Hz

ωx , ωz 2π*150Hz

mag. field 700 G

N↑,↓ 200 000

1/kFa 3

separation 64 µm

lens

Li

CCD

AOM

no slicing necessary

in situ

TOF=0 ms

in expansion

TOF = 14 ms

magnifying glass

clouds

clouds

4 ms

position

position

position

position

trap

trap

trap

trap


Relative phase
Relative phase from thermal to quantum noise, reflected

potential

clouds

phase

Same result for independent BECs


Temperature dependence from thermal to quantum noise, reflected

TC

bars are rms

~0.5TF=TC


Interaction strength
Interaction strength from thermal to quantum noise, reflected


Interaction strength from thermal to quantum noise, reflected


Interaction strength from thermal to quantum noise, reflected


potential from thermal to quantum noise, reflected

pairing

lifetime

collisions

detection

7% 17% 34%

not valid

0.1 1 30

Depleted part has no common phase

partial reflection

Ekin<Emf

Ekin>Epairing

no survival

We gotta be creative !

short lifetime of molecules

interactions limit

no pairs in expansion


potential from thermal to quantum noise, reflected

pairing

lifetime

collisions

detection

7% 17% 34%

not valid

0.1 1 30

partial reflection

Ekin<Emf

Ekin>Epairing

no survival

We gotta be creative !

short lifetime of molecules

interactions limit

no pairs in expansion


Interference of molecular BECs from thermal to quantum noise, reflected

The challenge of strong interaction

Tool for new physics


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