We study ultrasmall Josephson junctions using the coherent picture to describe the pair dynamics and the semiclassical approach for the quasiparticles. We find that the dynamics depends crucially on the ratio of the superconducting gap energy \ensuremath{\Delta}(T) to the charging energy ${\mathrm{e}}^{2}$ /2C. The pair ``Bloch oscillations'' can be practically observed when 2\ensuremath{\Delta}(T)> ${\mathrm{e}}^{2}$ /2C; for 2\ensuremath{\Delta}(T) ${\mathrm{e}}^{2}$ /2C the ${\mathrm{I}}_{\mathrm{dc}/\mathrm{e}}$ oscillations due to quasiparticle tunneling can be observed. We discuss under what conditions the I-V characteristic will be S-shaped, exhibiting both oscillations at different values of the current.We study ultrasmall Josephson junctions using the coherent picture to describe the pair dynamics and the semiclassical approach for the quasiparticles. We find that the dynamics depends crucially on the ratio of the superconducting gap energy \ensuremath{\Delta}(T) to the charging energy ${\mathrm{e}}^{2}$/2C. The pair ``Bloch oscillations'' can be practically observed when 2\ensuremath{\Delta}(T)>${\mathrm{e}}^{2}$/2C; for 2\ensuremath{\Delta}(T)${\mathrm{e}}^{2}$/2C the ${\mathrm{I}}_{\mathrm{dc}/\mathrm{e}}$ oscillations due to quasiparticle tunneling can be observed. We discuss under what conditions the I-V characteristic will be S-shaped, exhibiting both oscillations at different values of the current.

Physical Review LettersMar 14, 198842 citations

1B2 粒子数が一定でない統計集団の密度行列(1B 統計力学)

周小野

日本物理学会分科会講演予稿集Apr 1, 19540 citations

1C6 非粘性荷電流体の量子流体力学(1C 低温)

宣夫御子柴

日本物理学会春季分科会講演予稿集Apr 1, 19550 citations

{\mathrm{e}}^{2}

/2C. The pair ``Bloch oscillations'' can be practically observed when 2\ensuremath{\Delta}(T)>

{\mathrm{e}}^{2}

/2C; for 2\ensuremath{\Delta}(T)

{\mathrm{e}}^{2}

/2C the

{\mathrm{I}}_{\mathrm{dc}/\mathrm{e}}

oscillations due to quasiparticle tunneling can be observed. We discuss under what conditions the I-V characteristic will be S-shaped, exhibiting both oscillations at different values of the current.