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| Author |
Ynvesson, K. Sigfrid; Kollberg, Erik L. |
| Title |
Optimum receiver noise temperature for NbN HEB mixers according to standard model |
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Conference Article |
| Year |
1999 |
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Proc. 10th Int. Symp. Space Terahertz Technol. |
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566-582 |
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HEB mixer model, standard model, electro-thermal feedback, self-heating parameter, heating efficiency |
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895 |
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| Author |
Vercruyssen, N.; Verhagen, T. G. A.; Flokstra, M. G.; Pekola, J. P.; Klapwijk, T. M. |
| Title |
Evanescent states and nonequilibrium in driven superconducting nanowires |
Type |
Journal Article |
| Year |
2012 |
Publication |
Phys. Rev. B |
Abbreviated Journal |
Phys. Rev. B |
| Volume |
85 |
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224503(1-10) |
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Al HEB, Al superconducting nanowire, global state, bimodal state, quasiclassical kinetic equations, Usadel equation |
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We study the nonlinear response of current transport in a superconducting diffusive nanowire between normal reservoirs. We demonstrate theoretically and experimentally the existence of two different superconducting states appearing when the wire is driven out of equilibrium by an applied bias, called the global and bimodal superconducting states. The different states are identified by using two-probe measurements of the wire, and measurements of the local density of states with tunneling probes. The analysis is performed within the framework of the quasiclassical kinetic equations for diffusive superconductors. |
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898 |
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| Author |
Cooper, L. N. |
| Title |
Bound electron pairs in a degenerate fermi gas |
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Journal Article |
| Year |
1956 |
Publication |
Phys. Rev. |
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Phys. Rev. |
| Volume |
104 |
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4 |
Pages |
1189-1190 |
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BCS |
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899 |
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| Author |
Bardeen, J.; Cooper, L. N.; Schrieffer, J. R. |
| Title |
Microscopic theory of superconductivity |
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Journal Article |
| Year |
1957 |
Publication |
Phys. Rev. |
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Phys. Rev. |
| Volume |
106 |
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162-164 |
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900 |
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Bardeen, J.; Cooper, L. N.; Schrieffer, J. R. |
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Theory of superconductivity |
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Journal Article |
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1957 |
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Phys. Rev. |
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Phys. Rev. |
| Volume |
108 |
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5 |
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1175-1204 |
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BCS |
| Abstract |
A theory of superconductivity is presented, based on the fact that the interaction between electrons resulting from virtual exchange of phonons is attractive when the energy difference between the electrons states involved is less than the phonon energy, â„<8f>ω. It is favorable to form a superconducting phase when this attractive interaction dominates the repulsive screened Coulomb interaction. The normal phase is described by the Bloch individual-particle model. The ground state of a superconductor, formed from a linear combination of normal state configurations in which electrons are virtually excited in pairs of opposite spin and momentum, is lower in energy than the normal state by amount proportional to an average (â„<8f>ω)2, consistent with the isotope effect. A mutually orthogonal set of excited states in one-to-one correspondence with those of the normal phase is obtained by specifying occupation of certain Bloch states and by using the rest to form a linear combination of virtual pair configurations. The theory yields a second-order phase transition and a Meissner effect in the form suggested by Pippard. Calculated values of specific heats and penetration depths and their temperature variation are in good agreement with experiment. There is an energy gap for individual-particle excitations which decreases from about 3.5kTc at T=0°K to zero at Tc. Tables of matrix elements of single-particle operators between the excited-state superconducting wave functions, useful for perturbation expansions and calculations of transition probabilities, are given. |
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