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Subir Sachdev (Yale) Philipp Werner (ETH) Matthias Troyer (ETH)

Universal conductance of nanowires near the superconductor-metal quantum transition. Subir Sachdev (Yale) Philipp Werner (ETH) Matthias Troyer (ETH). cond-mat/0402431. Talk online: Sachdev. T=0 Superconductor-metal transition. Repulsive BCS interaction.

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Subir Sachdev (Yale) Philipp Werner (ETH) Matthias Troyer (ETH)

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  1. Universal conductance of nanowires near the superconductor-metal quantum transition Subir Sachdev (Yale) Philipp Werner (ETH) Matthias Troyer (ETH) cond-mat/0402431 Talk online: Sachdev

  2. T=0 Superconductor-metal transition Repulsive BCS interaction Attractive BCS interaction R Superconductor Metal Rc R M.V. Feigel'man and A.I. Larkin, Chem. Phys. 235, 107 (1998) B. Spivak, A. Zyuzin, and M. Hruska, Phys. Rev. B 64, 132502 (2001).

  3. T=0 Superconductor-metal transition yi R

  4. Continuum theory for quantum critical point

  5. Consequences of hyperscaling T No transition for T>0 in d=1 Normal Superconductor R Rc Sharp transition at T=0

  6. Consequences of hyperscaling Quantum Critical Region T No transition for T>0 in d=1 Normal Superconductor R Rc Sharp transition at T=0

  7. Consequences of hyperscaling Quantum Critical Region

  8. Consequences of hyperscaling Quantum Critical Region

  9. Effect of the leads

  10. Large n computation of conductance

  11. Quantum Monte Carlo and large n computation of d.c. conductance

  12. Conclusions • Universal transport in wires near the superconductor-metal transition • Theory includes contributions from thermal and quantum phase slips ---- reduces to the classical LAMH theory at high temperatures • Sensitivity to leads should be a generic feature of the ``coherent’’ transport regime of quantum critical points.

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