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Published April 1, 2008 | public
Journal Article Open

Tunneling density of states, pair correlation, and Josephson current in spin-incoherent Luttinger-liquid/superconductor hybrid systems

Abstract

We study a hybrid system consisting of a spin-incoherent Luttinger liquid adjoined at one or both ends to a superconductor. We find that the tunneling density of states diverges at low energies and exhibits a universal frequency dependence independent of the strength of the interactions in the system. We show that in spite of exponentially decaying pair correlations with distance into the spin-incoherent Luttinger liquid, the Josephson current remains robust. Compared to the zero temperature Luttinger-liquid case, there is a factor of 2 reduction in the critical current and a halving of the period in the phase difference between the superconductors. We hope these results motivate a class of experiments in the spin-incoherent regime of one-dimensional systems.

Additional Information

©2008 The American Physical Society. (Received 24 March 2008; published 18 April 2008) We are grateful to Oleg Starykh for helpful discussions and for financial support from the NSF under Grants No. PHY05-51164, and No. DMR-0606489, the Lee A. DuBridge Foundation, and the Welch Foundation.

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August 22, 2023
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