Critical conductance of a one-dimensional doped Mott insulator
| Autor: | Garst, M., Novikov, D. S., Stern, Ady, Glazman, L. I. |
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| Rok vydání: | 2007 |
| Předmět: | |
| Zdroj: | Phys. Rev. B 77, 035128 (2008) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevB.77.035128 |
| Popis: | We consider the two-terminal conductance of a one-dimensional Mott insulator undergoing the commensurate-incommensurate quantum phase transition to a conducting state. We treat the leads as Luttinger liquids. At a specific value of compressibility of the leads, corresponding to the Luther-Emery point, the conductance can be described in terms of the free propagation of non-interacting fermions with charge e/\sqrt{2}. At that point, the temperature dependence of the conductance across the quantum phase transition is described by a Fermi function. The deviation from the Luther-Emery point in the leads changes the temperature dependence qualitatively. In the metallic state, the low-temperature conductance is determined by the properties of the leads, and is described by the conventional Luttinger liquid theory. In the insulating state, conductance occurs via activation of e/\sqrt{2} charges, and is independent of the Luttinger liquid compressibility. Comment: 13 pages, 3 figures. Published version |
| Databáze: | arXiv |
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