ar X iv : c on d - m at / 0 40 24 31 v 2 9 A pr 2 00 4 Universal conductance of nanowires near the superconductor - metal quantum transition
نویسندگان
چکیده
We consider wires near a zero temperature transition between superconducting and metallic states. The critical theory obeys hyperscaling, which leads to a universal frequency, temperature, and length dependence of the conductance; quantum and thermal phase slips are contained within this critical theory. Normal (NN), superconducting (SS) and mixed (SN) leads on the wire determine distinct universality classes. For the SN case, wires near the critical point have a universal d.c. conductance which is independent of the length of the wire at low temperatures.
منابع مشابه
ar X iv : c on d - m at / 0 51 05 97 v 2 17 J an 2 00 7 Thermoelectric transport near the pair breaking quantum phase transition out of a d - wave superconductor
We study electric, thermal, and thermoelectric conductivities in the vicinity of a z = 2 superconductor-diffusive metal transition in two dimensions, both in the high and low frequency limits. We find violation of the Wiedemann-Franz law and a dc thermoelectric conductivity α that does not vanish at low temperatures, in contrast to Fermi liquids. We introduce a Langevin equation formalism to st...
متن کاملar X iv : 0 80 4 . 31 43 v 1 [ m at h . A G ] 1 9 A pr 2 00 8 RUAN ’ S CONJECTURE ON SINGULAR SYMPLECTIC FLOPS
We prove that the orbifold quantum ring is preserved under singular symplectic flops. Hence we verify Ruan’s conjecture for this case.
متن کاملar X iv : c on d - m at / 9 31 20 13 v 1 2 D ec 1 99 3 Orthogonality catastrophe in a mesoscopic conductor due to a time - dependent flux
We consider quantum fluctuations of current in a metallic loop induced by varying magnetic flux. The dependence of the fluctuations on the flux change Φ contains a logarithmically divergent term periodic in Φ with the period Φ 0 = hc/e. The fluctuation is smallest near Φ = nΦ 0. The divergence is explained by a comparison with the orthogonality catastrophe problem. The Φ 0 −periodicity is relat...
متن کاملar X iv : c on d - m at / 9 31 10 42 v 1 1 7 N ov 1 99 3 Cooper pair tunnelling into a Quantum Hall fluid Matthew
Transport through a tunnel junction connecting a superconductor to a spin-aligned quantum Hall fluid at filling ν is studied theoretically. The dominant transport channel at low temperatures is the tunnelling of Cooper pairs into edge states of the quantum Hall fluid. This process, which is greatly suppressed at low energies due to both Coulomb and Pauli exclusion effects, leads to a tunnelling...
متن کاملar X iv : c on d - m at / 0 10 41 76 10 A pr 2 00 1 Quantum Phase Transitions and Collective Modes in d - wave Superconductors
Fluctuations near second-order quantum phase transitions in d-wave superconductors can cause strong damping of fermionic excitations, as observed in photoemission experiments. The damping of the gapless nodal quasiparticles can arise naturally in the quantum-critical region of a transition with an additional spin-singlet, zero momentum order parameter; we argue that the transition to a dx2−y2 +...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2004