Weak-field dissipative conductivity of a dirty superconductor with Dynes subgap states under a dc bias current up to the depairing current density
Weak-field dissipative conductivity of a dirty superconductor with Dynes subgap states under a dc bias current up to the depairing current density
复制标题
具有达因子带隙状态的脏超导体在直流偏置电流达到脱配电流密度下的弱场耗散电导率
DOI：
10.1103/physrevresearch.2.013302
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发表时间：
2020
影响因子：
4.2
通讯作者：
Takayuki Kubo
中科院分区：
文献类型：
--
作者：
Kato Yuta;Matsuda Yuichi;Iono Daisuke;Hatsukade Bunyo;Umehata Hideki;Kohno Kotaro;Alexander David M;Ao Yiping;Chapman Scott C;Hayes Matthew;Kubo Mariko;Lehmer Bret D;Malkan Matthew A;Michiyama Tomonari;Nagao Tohru;Saito Tomoki;Tanaka Ichi;Taniguchi Yoshia;谷津 陽一;黒田裕介;K. Tsukada;Takayuki Kubo
本文研究了具有有限Dynes参数的脏超导体在直流偏置弱含时场作用下的耗散电导率。Usadel方程的载流状态求解计算的对电位，穿透深度，超电流密度，和准粒子谱。结果表明，当超流密度与Kupriyanov-Lukichev理论一致时，有限的超流密度减小，导致超流密度减小.在有限偏压和直流偏压的共同作用下，准粒子态密度峰的展宽可以减小到理想脏BCS超导体的峰以下，而费米能级处的亚能隙态则导致剩余电导率为。我们通过扫描所有和所有的电流，找到最佳的和直流偏置的组合，以最大限度地减少。利用这些结果，可以改善和降低各种超导量子器件的电磁耗散。
We study the dissipative conductivityof a dirty superconductor with a finite Dynes parameterunder a dc-biased weak time-dependent field. The Usadel equation for the current-carrying state is solved to calculate the pair potential, penetration depth, supercurrent density, and quasiparticle spectrum. It is shown that, while the depairing current densityforis coincident with the Kupriyanov-Lukichev theory, a finitedecreases the superfluid density, resulting in a reduction of. The broadening of the peaks of the quasiparticle density of states induced by a combination of a finiteand a dc bias can reducebelow that for the ideal dirty BCS superconductor with, while subgap states at Fermi level proportional toresults in a residual conductivity at. We find the optimum combination ofand the dc bias to minimizeby scanning alland all currents up to. By using the results, it is possible to improveand reduce electromagnetic dissipation in various superconducting quantum devices.