Theoretical Nanophysics

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Strong coupling fixed points of Luttinger liquids

Alexander Altland (University of Cologne)

01.03.2013 at 10:15 

I will discuss what may happen when electronic quantum wires contain
scattering regions supporting both coherent and incoherent scattering
channels. Setups of this type may be realized in quantum Hall
geometries, semiconducting and metallic quantum wires, or graphene edge
state geometries. The principal observation is that at low temperatures
the system flows towards a stable fixed point, profoundly different from
the standard (Kane-Fisher) fixed point describing purely coherent types
of scattering. Transport at the novel fixed point is distinguished for
equal probabilities of forward and backward scattering – the scatterer
acts as a perfect 'beam splitter'. I will discuss the ensuing low
temperature physics, and the theoretical picture behind the fixed point

A348 - Theresienstr. 37