منابع مشابه
Graphene based superconducting quantum point contacts
We investigate the Josephson effect in the graphene nanoribbons of length L smaller than the superconducting coherence length and an arbitrary width W . We find that in contrast to an ordinary superconducting quantum point contact (SQPC) the critical supercurrent Ic is not quantized for the nanoribbons with smooth and armchair edges. For a low concentration of the carriers Ic decreases monotoni...
متن کاملAdiabatic dynamics of superconducting quantum point contacts.
Starting from the quasiclassical equations for non-equilibrium Green's functions we derive a simple kinetic equation that governs ac Josephson effect in a superconducting quantum point contact at small bias voltages. In contrast to existing approaches the kinetic equation is valid for voltages with arbitrary time dependence. We use this equation to calculate frequency-dependent linear conductan...
متن کاملConduction channels of superconducting quantum point contacts
Atomic quantum point contacts accommodate a small number of conduction channels. Their number N and transmission coe$cients M1 n N can be determined by analyzing the subgap structure due to multiple Andreev re#ections in the current}voltage (I}<) characteristics in the superconducting state. With the help of mechanically controllable break-junctions we have produced Al contacts consisting of a ...
متن کاملSensing with Superconducting Point Contacts
Superconducting point contacts have been used for measuring magnetic polarizations, identifying magnetic impurities, electronic structures, and even the vibrational modes of small molecules. Due to intrinsically small energy scale in the subgap structures of the supercurrent determined by the size of the superconducting energy gap, superconductors provide ultrahigh sensitivities for high resolu...
متن کاملImaging in Quantum Point Contacts
Alessandro Cresti , Giuseppe Grosso (2) and Giuseppe Pastori Parravicini (3) (1) NEST-INFM, Scuola Normale Superiore, Piazza dei Cavalieri 7, I-56126 Pisa, Italy, and Dipartimento di Fisica E. Fermi, Largo B. Pontecorvo 3, I-56127 Pisa, Italy [email protected] (2) NEST-INFM and Dipartimento di Fisica E. Fermi, Largo B. Pontecorvo 3, I-56127 Pisa, Italy (3) NEST-INFM and Dipartimento di Fisica ...
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ژورنال
عنوان ژورنال: Comptes Rendus Physique
سال: 2012
ISSN: 1631-0705
DOI: 10.1016/j.crhy.2011.12.006