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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

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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


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


BEC

BCS

molecules

many-body pairs

Fermionic lithium – our workhorse

Let‘s open the door!


TOF-Images

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


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/kFa3

separation64 µm

lens

Li

create split overlap observe

CCD

AOM

z

x

split create overlap observe

z

Procedure

y

x

confinement

z

y

x


Expansion

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/kFa3

separation64 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

potential

clouds

phase

Same result for independent BECs


Temperature dependence

TC

bars are rms

~0.5TF=TC


Interaction strength


Interaction strength


Interaction strength


potential

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

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

The challenge of strong interaction

Tool for new physics


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