Quantum criticality in a mott pn junction in an armchair carbon nanotube

Wei Chen, A. V. Andreev, L. I. Glazman

Research output: Contribution to journalArticlepeer-review


In an armchair carbon nanotube pn junction the p and n regions are separated by a region of a Mott insulator, which can backscatter electrons only in pairs. We predict a quantum-critical behavior in such a pn junction. Depending on the junction's built-in electric field E, its conductance G scales either to zero or to 4e2/h as the temperature T is lowered. The two types of the G(T) dependence indicate the existence, at some special value of E, of an intermediate quantum-critical point with a finite conductance G<4e2/h. This makes the pn junction drastically different from a simple potential barrier in a Luttinger liquid.

Original languageEnglish
Article number216801
JournalPhysical Review Letters
Issue number21
Publication statusPublished - 23 May 2011
Externally publishedYes


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