SP seminar 17.11.2015 at ICTP: Tilman Enss

[Condensed Matter Section]

JOINT ICTP/SISSA STATISTICAL PHYSICS SEMINAR

Tuesday, 17th November - 11:00 a.m.

ICTP, Stasi Lecture Hall, first floor


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Speaker: Tilmann Enss (University of Heidelberg)

Title: Spin transport in ultracold Fermi gases

Many strongly correlated quantum fluids exhibit universal transport
properties, notably a famous quantum bound on the internal friction.
In this talk I will discuss transport in a unitary Fermi gas:
strong-coupling computations show that the shear viscosity, which
determines friction, signals almost perfect fluidity in the quantum
degenerate regime.  Similarly, spin diffusion becomes slower at strong
interaction and reaches a quantum limit, in agreement with a recent
experiment at MIT.  In the case of transverse spin diffusion the spin
current will also precess around the local magnetization.  This
Leggett-Rice effect has now been observed and provides new insight
into the effective interaction in a unitary Fermi gas.

[1] Enss, Haussmann & Zwerger, Ann. Phys. 326, 770 (2011).
[2] Enss & Haussmann, Phys. Rev. Lett. 109, 195303 (2012).
[3] Bauer, Parish & Enss, Phys. Rev. Lett. 112, 135302 (2014).
[4] Trotzky, Beattie, Luciuk, Smale, Bardon, Enss, Taylor, Zhang &
Thywissen, Phys. Rev. Lett. 114, 015301 (2015).

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