Nonreciprocal charge transport in noncentrosymmetric superconductors.
Nonreciprocal charge transport in noncentrosymmetric superconductors.
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DOI：
10.1126/sciadv.1602390
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发表时间：
2017-04
期刊：
影响因子：
13.6
通讯作者：
Nagaosa N
中科院分区：
文献类型：
--
作者：
Wakatsuki R;Saito Y;Hoshino S;Itahashi YM;Ideue T;Ezawa M;Iwasa Y;Nagaosa N
对非中心对称超导体中的巨非倒输运效应进行了理论和实验研究。晶体中缺乏空间反演对称性提供了丰富多样的物理现象，如铁电性和非线性光学效应（例如二次谐波产生）。其中一种现象是磁手性各向异性，其中电阻取决于外部磁场下的电流方向。我们从实验和理论上证明，一旦材料进入超导状态，这种手性磁各向异性显着增强了几个数量级。为了说明这种增强，我们研究了二硫化钼门控诱导的二维非中心对称超导态的磁输运性质。这些结果表明，当电子形成库珀对时，在相关长度范围内，电子对非中心对称晶体电位的感受是相干的和敏感的，并为增强对包括超导二极管在内的新功能的非互反响应开辟了新的途径。
Giant nonreciprocal transport effect in noncentrosymmetric superconductors is studied both theoretically and experimentally. Lack of spatial inversion symmetry in crystals offers a rich variety of physical phenomena, such as ferroelectricity and nonlinear optical effects (for example, second harmonic generation). One such phenomenon is magnetochiral anisotropy, where the electrical resistance depends on the current direction under the external magnetic field. We demonstrate both experimentally and theoretically that this magnetochiral anisotropy is markedly enhanced by orders of magnitude once the materials enter into a superconducting state. To exemplify this enhancement, we study the magnetotransport properties of the two-dimensional noncentrosymmetric superconducting state induced by gating of MoS2. These results indicate that electrons feel the noncentrosymmetric crystal potential much coherently and sensitively over the correlation length when they form Cooper pairs, and show open a new route to enhance the nonreciprocal response toward novel functionalities, including superconducting diodes.