arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2102.12150cond-mat.supr-concond-mat.str-el
收藏

KCa2Fe4As4F2中涡旋束缚态在极端量子极限下的Friedel振荡

Friedel Oscillations of Vortex Bound States Under Extreme Quantum Limit in KCa2Fe4As4F2

Xiaoyu Chen, Wen Duan, Xinwei Fan, Wenshan Hong, Kailun Chen, Huan Yang, Shiliang Li, Huiqian Luo, Hai-Hu Wen

摘要:

利用扫描隧道显微镜(STM)在铁基超导体KCa_2Fe_4As_4F_2的涡旋中观察到了离散的涡旋束缚态,其能级偏离了人们普遍认为的1:3:5的比例.同时在相关涡旋中也首次观察到涡旋束缚态的Friedel振荡。通过对Bogoliubov-de Gennes方程的自洽计算,发现在极端量子极限下,超导序参量呈现出类Friedel振荡,这种振荡改变了涡旋束缚态的能级,解释了涡旋束缚态偏离1:3:5的原因.束缚态的Friedel振荡也可以通过理论计算得到粗略的解释,但高能下的一些特征无法解释。我们将这种差异归因于附近杂质的影响下的高能量束缚态。我们结合STM测量和自洽计算说明了II型超导体中涡旋束缚态的一般特征。

英文摘要:

We report the observation of discrete vortex bound states with the energy levels deviating from the widely believed ratio of 1:3:5 in the vortices of an iron based superconductor KCa2Fe4As4F2 through scanning tunneling microcopy (STM). Meanwhile Friedel oscillations of vortex bound states are also observed for the first time in related vortices. By doing self-consistent calculations of Bogoliubov-de Gennes equations, we find that at extreme quantum limit, the superconducting order parameter exhibits a Friedel-like oscillation, which modifies the energy levels of the vortex bound states and explains why it deviates from the ratio of 1:3:5. The observed Friedel oscillations of the bound states can also be roughly interpreted by the theoretical calculations, however some features at high energies could not be explained. We attribute this discrepancy to the high energy bound states with the influence of nearby impurities. Our combined STM measurement and the self-consistent calculations illustrate a generalized feature of the vortex bound states in type-II superconductors.

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。

↑