Superconductivity in Nanoscale Systems

High-temperature superconductivity in one-unit-cell FeSe films

“…1-UC FeSe/STO [10][11][12][13][14][15][16][17][18][19][20][21][22][23] and La 2 CuO 4+δ / La 1.55 Sr 0.45 CuO 4 [54,55]. (3) Since fluctuations and dis order play an important role in low dimensional systems [56], some new phenomena beyond the classical mean field theory have emerged in superconducting films, such as the quantum phase transition [57] and quantum Griffith singularity [58]. (4) Disordered superconducting thin films close to the quantum phase transition provide a platform to detect the Higgs mode [59].…”

Direct evidence of high temperature superconductivity in one-unit-cell FeSe films on SrTiO 3 substrate by transport and magnetization measurements

“…When one dimension of a bulk superconductor decreases to smaller than the coherence length of the Cooper pairs, the superconductor can be considered as a quasi-two dimensional (quasi-2D) superconductor. [14] Due to thermo and quantum fluctuations, which are more severe in the low dimensional system, the superconductivity should be suppressed by decreasing the thickness of a superconducting film, which has been confirmed by many groups. [15][16][17] However, for quasi-2D superconductors epitaxially grown on substrates, the interface may promote T c by enhancing the electron-phonon coupling [18] and the epitaxial strain.…”

拓扑绝缘体与低维超导体的电输运特性

“…低维超导是凝聚态物理里面最重要的方向之一, 其中二维的超导薄膜更是引起了广泛的关注. 随着 纳米微加工技术的发展, 纳米结构材料越来越多的 呈现出来 [41][42][43] . 由于实际应用的需求, 在半导体衬底 上生长超导薄膜或进行纳米微加工则具有重要意义.…”