Maykel L. González-Martínez Challenges @ ultracold temperatures [email protected]...
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![Page 1: Maykel L. González-Martínez Challenges @ ultracold temperatures maykel.gonzalez-martinez@u-psud.fr October 3 th, 2013. Bordeaux.](https://reader035.fdocuments.in/reader035/viewer/2022062408/56649f225503460f94c3ae7b/html5/thumbnails/1.jpg)
Maykel L. González-Martínez
Challenges @ ultracold temperatures
[email protected] October 3th, 2013. Bordeaux
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October 3th, 2013. Bordeaux
Why?
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October 3th, 2013. Bordeaux
... it's not about the money
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October 3th, 2013. Bordeaux
(the) science is
cool!
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G Quéméner and PS Julienne Chem. Rev. 112, 4949 (2012) October 3th, 2013. Bordeaux
... fairly cold
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http://cua.mit.edu/ketterle_group/experimental_setup/BEC_I/background.html
control...?
October 3th, 2013. Bordeaux
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October 3th, 2013. BordeauxT Kraemer Nature 440, 315 (2006)
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October 3th, 2013. BordeauxI Bloch Nature Phys. 1, 23 (2005)
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October 3th, 2013. BordeauxM Baranov et al. Chem. Rev. 112, 5012 (2012)
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October 3th, 2013. BordeauxG Quéméner and PS Julienne Chem. Rev. 112, 4949 (2012)
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October 3th, 2013. BordeauxKP Schmidt et al. Phys. Rev. Lett. 101, 150405 (2008)
Novel condensed phases
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October 3th, 2013. Bordeaux
is it...
RECOGNITION?
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October 3th, 2013. Bordeauxultracold in title: ISI Web of Knowledge (30/09/2013)
publications
citations
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October 3th, 2013. Bordeauxultracold in title, PRL: ISI Web of Knowledge (30/09/2013)
publications (PRL)
citations (PRL)
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October 3th, 2013. Bordeaux
Steven Chu Claude Cohen-Tannouidji
William D. Phillips
Serge Haroche David Wineland
Eric A. CornellWolfgang KetterleCarl E. Wieman
1997
2001
2012
Photos: U Montan
Photos: The Nobel Foundation
Photos: The Nobel Foundation
“... methods that enable measuring and manipulation of individual
quantum systems...”
“... achievement of Bose-Einsten condensation... fundamental
studies of the properties of the condensates.”
“... methods to cool and trap atoms with laser light.”
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October 3th, 2013. Bordeaux
1997
2001
2012
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October 3th, 2013. Bordeaux
Indirectly*
* from ultracold atoms
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October 3th, 2013. Bordeaux
The `ultracold' Periodic Table
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October 3th, 2013. BordeauxFig. from J Herbig et al. Science 301, 1510 (2003)
M agneto-association
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October 3th, 2013. BordeauxT Takekoshi et al. Phys. Rev. A. 85, 032506 (2012)
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October 3th, 2013. BordeauxFig .from J Ulmanis et al. Chem. Rev. 112, 4890 (2012)
P hoto-association
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October 3th, 2013. Bordeaux
Directly* * from `warm' species
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October 3th, 2013. BordeauxLD Carr et al. New J. Phys. 11, 055049 (2009)
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Collisions
Evaporative coolingBuffer-gas cooling
Sympathetic cooling
THERMALIZATION
Lifetimes in trapsTrap losses
TRAP DYNAMICS
Reproduce · Understand · PredictOctober 3th, 2013. Bordeaux
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October 3th, 2013. Bordeaux
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October 3th, 2013. Bordeaux
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`Traditional' coupled-channel methodology
Problem
N coupled (differential) equations
Observables!(SS/TT matrix)
effort (time) ∝ N3
interpretation
October 3th, 2013. Bordeaux
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effort/calc. Low anisotropy Large anisotropy
Rotation N ≈ 1–10 t ∝ (m)seconds
N ≈ 102–104
t ∝ mins, hours...
Fine(electronic spin)
N' ≈ N ✕ 2–10 t' ≈ t ✕10–103
Hyperfine(nuclear spin)
N' ✕ 2–102 t' ✕10–106
1Basis size
FrustrationFrustration
October 3th, 2013. Bordeaux
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Field strengthCollision energy
Collisions take place in traps...
... at a given 'temperature'.
Potential 'survey'
Well... and potentials are not 100% accurate
+ field strength '2'+ angle f1/f2
...
Hmm... if we really need to make it 'real'...
2Parameters
October 3th, 2013. Bordeaux
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Jan 31, 2013. MMQA'13, London
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... there are alternatives, aren't there?!
October 3th, 2013. Bordeaux
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Uff... do we really have to?
I know... but how far can we go if...?
... sure there aren't other ways?
NO (if it's difficult!): Bohn's (et al.) statistical approach Phys. Rev. A 85, 062712 (2012) Phys. Rev. A 87, 012709 (2013)
total-J approximation: Tsherbul's (et al.) J. Chem. Phys. 133, 184104 (2010) Phys. Rev. A 84, 040701 (2011) J. Chem. Phys. 137, 024103 (2012) Phys. Rev. A 85, 052710 (2012)
Multichannel Quantum Defect Theory: Croft's (et al.) Phys. Rev. A 84, 042703 (2011) Phys. Rev. A 86, 022711 (2012) Phys. Rev. A 87, 032710 (2013)
McBane (optimisations, approximations)MLGM (approximate hyperfine, single column)
1 2
1
1
To 'CC' or not to 'CC'...
'1'
October 3th, 2013. Bordeaux
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October 3th, 2013. Bordeaux
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October 3th, 2013. BordeauxM Mayle et al. Phys. Rev. A 85, 062712 (2012)
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October 3th, 2013. BordeauxM Mayle et al. Phys. Rev. A 85, 062712 (2012)
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October 3th, 2013. Bordeaux
quantum Scattering at Ultracold temPERatures:a few S-matrix COLumns is all we neeD
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October 3th, 2013. Bordeaux
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October 3th, 2013. Bordeaux
pioneering
multi-disciplinary
evolving
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Many Thanks!