Magnetic-related States and Order Parameter Induced in a Conventional Superconductor by Nonmagnetic Chiral Molecules

被引：43

作者：

Alpern, Hen ^{[1
,2
,3
]}

Yavilberg, Konstantin ^{[4
]}

Dvir, Tom ^{[1
,2
]}

Sukenik, Nir ^{[3
]}

Klang, Maya ^{[1
,2
]}

Yochelis, Shira ^{[3
]}

Cohen, Hagai ^{[5
]}

Grosfeld, Eytan ^{[4
]}

Steinberg, Hadar ^{[1
,2
]}

Paltiel, Yossi ^{[3
]}

Millo, Oded ^{[1
,2
]}

机构：

[1] Hebrew Univ Jerusalem, Racah Inst Phys, IL-91904 Jerusalem, Israel

[2] Hebrew Univ Jerusalem, Ctr Nanosci & Nanotechnol, IL-91904 Jerusalem, Israel

[3] Hebrew Univ Jerusalem, Ctr Nanosci & Nanotechnol, Appl Phys Dept, IL-91904 Jerusalem, Israel

[4] Ben Gurion Univ Negev, Dept Phys, IL-84105 Beer Sheva, Israel

[5] Weizmann Inst Sci, Chem Serv Unit, IL-76100 Rehovot, Israel

来源：

NANO LETTERS | 2019年 / 19卷 / 08期

基金：

欧洲研究理事会; 以色列科学基金会;

关键词：

superconductivity; YSR states; chiral molecules; NbSe2; SPIN SELECTIVITY; BOUND-STATES;

D O I：

10.1021/acs.nanolett.9b01552

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Hybrid ferromagnetic/superconducting systems are well-known for hosting intriguing phenomena such as emergent triplet superconductivity at their interfaces and the appearance of in-gap, spin-polarized Yu-Shiba-Rusinov (YSR) states bound to magnetic impurities on a superconducting surface. In this work we demonstrate that similar phenomena can be induced on a surface of a conventional superconductor by chemisorbing nonmagnetic chiral molecules. Conductance spectra measured on NbSe2 flakes over which chiral alpha-helix polyalanine molecules were adsorbed exhibit, in some cases, in gap states nearly symmetrically positioned around zero bias that shift with magnetic field, akin to YSR states, as corroborated by theoretical simulations. Other samples show evidence for a collective phenomenon of hybridized YSR-like states giving rise to unconventional, possibly triplet superconductivity, manifested in the conductance spectra by the appearance of a zero bias conductance that diminishes, but does not split, with magnetic field. The transition between these two scenarios appears to be governed by the density of adsorbed molecules.

引用

页码：5167 / 5175

页数：9

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