Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2009-01-05
AIP Conference Proceedings, vol. 1063, pp 26-34 (2008)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
p99, two figs
Scientific paper
Where, and how, does energy dissipation of electrical energy take place in a ballistic wire? Fully two decades after the advent of the transmissive phenomenology of electrical conductance, this deceptively simple query remains unanswered. We revisit the quantum kinetic basis of dissipation and show its power to give a definitive answer to our query. Dissipation leaves a clear, quantitative trace in the non-equilibrium current noise of a quantum point contact; this signature has already been observed in the laboratory. We then highlight the current state of accepted understandings in the light of well-known yet seemingly contradictory measurements. The physics of mesoscopic transport rests not in coherent carrier transmission through a perfect and dissipationless metallic channel, but explicitly in their dissipative inelastic scattering at the wire's interfaces and adjacent macroscopic leads.
Das Mukunda P.
Green Frederick
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