Two-level Physics in a Model Metallic Break Junction

Autor:	Lucignano, P., Santoro, G. E., Fabrizio, M., Tosatti, E.
Rok vydání:	2008
Předmět:	Condensed Matter - Strongly Correlated Electrons Condensed Matter - Mesoscale and Nanoscale Physics
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevB.78.155418
Popis:	We consider a model inspired by a metal break-junction hypothetically caught at its breaking point, where the non-adiabatic center-of-mass motion of the bridging atom can be treated as a two-level system. By means of Numerical Renormalization Group (NRG) we calculate the influence of the two level system on the ballistic conductance across the bridge atom. The results are shown to be fully consistent with a conformal field theory treatment. We find that the conductance, calculated by coupling Fermi liquid theory to our NRG is always finite and fractional at zero temperature, but drops quite fast as the temperature increases. Comment: 9 pages 6 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/0807.5057 Zobrazit plný text záznamu View this record from Arxiv