- School of Physics - Research Publications
School of Physics - Research Publications
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ItemSELF-CONSISTENT CURRENT-VOLTAGE CHARACTERISTICS OF SUPERCONDUCTING NANOSTRUCTURESMARTIN, A ; LAMBERT, CJ (AMERICAN PHYSICAL SOC, 1995-06-15)
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ItemSelf-consistent interface properties of d- and s-wave superconductorsMartin, AM ; Annett, JF (AMER PHYSICAL SOC, 1998-04-01)
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ItemTilt grain-boundary effects in s- and d-wave superconductorsHogan-O'Neill, JJ ; Martin, AM ; Annett, JF (AMER PHYSICAL SOC, 1999-08-01)
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ItemCoherent potential approximation for d-wave superconductivity in disordered systemsMartin, AM ; Litak, G ; Györffy, BL ; Annett, JF ; Wysokinski, KI (AMER PHYSICAL SOC, 1999-09-01)
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ItemCharge fluctuations in a quantum point contact attached to a superconducting leadMartin, AM ; Gramespacher, T ; Büttiker, M (AMER PHYSICAL SOC, 1999-11-01)
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ItemCharge relaxation and dephasing in Coulomb-coupled conductorsBüttiker, M ; Martin, AM (AMER PHYSICAL SOC, 2000-01-15)
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ItemCoulomb-induced positive current-current correlations in normal conductorsMartin, AM ; Büttiker, M (AMER PHYSICAL SOC, 2000-04-10)In the white-noise limit current correlations measured at different contacts of a mesoscopic conductor are negative due to the antisymmetry of the wave function (Pauli principle). We show that current fluctuations at capacitive contacts induced via the long range Coulomb interaction due to charge fluctuations in the mesoscopic sample can be positively correlated. The positive correlations are a consequence of the extension of the wave functions into areas near both contacts. As an example we investigate in detail a quantum point contact in a high magnetic field under conditions in which transport is along an edge state.
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ItemCharge and low-frequency response of normal-superconducting heterostructures -: art. no. 045321Pilgram, S ; Schomerus, H ; Martin, AM ; Büttiker, M (AMER PHYSICAL SOC, 2002-01-15)
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ItemNonlinear hole transport through a submicron-size channelMakarovsky, O ; Neumann, A ; Martin, AM ; Turyanska, L ; Patanè, A ; Eaves, L ; Henini, M ; Main, PC ; Thoms, S ; Wilkinson, CDW ; Maude, DK ; Portal, JC (AMER INST PHYSICS, 2003-02-10)We investigate hole transport through a submicron-size channel fabricated from a modulation-doped p-type GaAs/(AlGa)As single-quantum-well heterostructure. The intense electric field in the channel accelerates the holes beyond the inflection point of the lowest energy subband dispersion curve. This leads to current saturation and negative differential conduction effects in the current–voltage characteristics.
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ItemModel for the voltage steps in the breakdown of the integer quantum Hall effectMartin, AM ; Benedict, KA ; Sheard, FW ; Eaves, L (AMERICAN PHYSICAL SOC, 2003-09-19)In samples used to maintain the U.S. resistance standard the breakdown of the dissipationless integer quantum Hall effect occurs as a series of dissipative voltage steps. A mechanism for this type of breakdown is proposed, based on the generation of magnetoexcitons when the quantum Hall fluid flows past an ionized impurity above a critical velocity. The calculated generation rate gives a voltage step height in good agreement with measurements on both electron and hole gases. We also compare this model to a hydrodynamic description of breakdown.