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arXiv 2406.09607cond-mat.mes-hallcond-mat.str-elcond-mat.supr-con
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简并半导体中超导态的栅压调控

Gate voltage modulation of the superconducting state in a degenerate semiconductor

Bikash C. Barik, Himadri Chakraborti, Buddhadeb Pal, Aditya K. Jain, Swagata Bhunia, Sounak Samanta, Apurba Laha, Suddhasatta Mahapatra, K. Das Gupta

AI总结:

本研究通过栅压调控GaN上外延InN的载流子密度,实现超导转变温度最高204 mK的变化,并证明其主导因素是载流子密度而非无序散射。

摘要:

在本工作中,我们证明,在氮化镓上外延生长的氮化铟中,载流子密度的调控可使超导转变温度改变最高204 mK,相当于无栅极条件下转变温度的10%。我们的样品很可能不存在强局域化效应和显著颗粒性,$(k_{fl}\gg1)$表明了这一点,说明InN中转变温度的主要决定因素是载流子密度,而非无序散射。所观测到的行为与BCS s波超导一致,并由我们测得的超导参数所证实。此外,我们在实验中观测到超电流出现60%的双极抑制。

英文摘要:

In this work, we demonstrate that the modulation of carrier density can alter the superconducting transition temperature by up to $204$ mK in epitaxial Indium Nitride on Gallium Nitride, accounting for the $10$% of the transition temperature in ungated conditions. Our samples are likely free from strong localization effects and significant granularity, as indicated by $( k_{f l} \gg 1 )$, suggesting that the primary determinant of the transition temperature in InN is carrier density, rather than disorder scattering. The observed behavior is consistent with BCS s-wave superconductivity, corroborated by the superconducting parameters we measured. Furthermore, we observed a $60$% bipolar suppression of the supercurrent in our experiments.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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