Thursday, August 25, 2011, 1:30 pm — Small seminar room, Bldg. 510
Non-equilibrium spin systems have been studied for decades. An example of a PNEQ system is one generated by the rapid melting of solid 3He that ends up with a large spin polarization of the liquid phase of 3He with little or no external magnetic field present. Thermodynamic and transport properties of spin polarized 3He have been studied extensively but there has been less work on the spin waves of these systems. In his talk I will discuss the transverse spin waves of a polarized non-equilibrium, PNEQ, system. The starting point will be a paramagnetic Fermi liquid that has a net spin polarization, in the absence of an external field. For this non-equilibrium case we have shown [1,2] that the spin waves in a PNEQ system are gapless in sharp contrast to the gapped spin waves in a polarized equilibrium Fermi liquid. Here we will begin to explore the consequences of these gapless spin wave modes in other PNEQ systems, e.g., spintronic systems and colliding spin polarized atomic gases.
1. Spin Waves in Quasiequilibrium Spin Systems, Kevin S. Bedell and Hari P. Dahal, Phys. Rev. Lett. 97, (2006).
2. Spin waves in a persistent spin-current Fermi liquid, J. D. Feldmann and K. S. Bedell, Phys. Rev. A 81, 063622 (2010).
Hosted by: Robert Konik
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