Entropy flow through near-critical quantum junctions

Details Entropy flow through near-critical quantum junctions Entropy flow through near-critical quantum junctions

2005-05-04

arxiv.org/abs/cond-mat/0505085v1

Physics

Condensed Matter

Statistical Mechanics

19 pages, no figures

Scientific paper

This is the continuation of cond-mat/0505084. Elementary formulas are derived for the flow of entropy through a circuit junction in a near-critical quantum circuit, based on the structure of the energy-momentum tensor at the junction. The entropic admittance of a near-critical junction in a bulk-critical circuit is expressed in terms of commutators of the chiral entropy currents. The entropic admittance at low frequency, divided by the frequency, gives the change of the junction entropy with temperature -- the entropic ``capacitance''. As an example, and as a check on the formalism, the entropic admittance is calculated explicitly for junctions in bulk-critical quantum Ising circuits (free fermions, massless in the bulk), in terms of the reflection matrix of the junction. The half-bit of information capacity per end of critical Ising wire is re-derived by integrating the entropic ``capacitance'' with respect to temperature, from T=0 to T=infinity.

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