DOI: 10.5061/dryad.4xgxd25jf
title: Signatures of a spin-active interface and locally enhanced Zeeman field in a superconductor-chiral material heterostructure

description: A localized Zeeman field intensified at heterostructure interfaces, could
 play a crucial role in a broad area including spintronics and
 unconventional superconductors. Conventionally, the generation of a local
 Zeeman field is achieved through magnetic exchange coupling with a
 magnetic material. However, magnetic elements often introduce defects,
 which could weaken or destroy superconductivity. Alternatively, the
 coupling between a superconductor with strong spin-orbit coupling and a
 non-magnetic chiral material could serve as a promising approach to
 generate a spin-active interface. In this study, we leverage an interface
 superconductor, namely induced superconductivity in noble metal surface
 states, to probe the spin-active interface. Our results unveil an enhanced
 interface Zeeman field, which selectively closes the surface
 superconducting gap while preserving the bulk superconducting pairing. The
 chiral material, i.e., trigonal tellurium, also induces Andreev-bound
 states (ABS) exhibiting spin polarization. The field dependence of ABS
 manifests a substantially enhanced interface Landé g-factor (  ~
 12), thereby corroborating the enhanced interface Zeeman energy.
description: # Signatures of a spin-active interface and locally enhanced Zeeman field
 in a superconductor-chiral material heterostructure
 [https://doi.org/10.5061/dryad.4xgxd25jf](https://doi.org/10.5061/dryad.4xgxd25jf) The data set has three parts. The "ManuscriptFigures3-29-24.opju" contains all tunneling and transport data. The "GIXRDdata.zip" contains all grazing incidence x-ray data. The "resonator_data.opju" contains all microwave resonator data. The data is collected through LabView software and saved as .txt files on computers. ## Description of the data and file structure The ManuscriptFigures3-29-24.opju file contains all tunneling and transport measurement data. It can be opened using standard Origin software. The raw data is saved in each workbook in the Origin file. The columns in the workbook are labeled accordingly for example "Vbias", which means the bias voltage in tunneling measurement. All workbook columns corresponding to "Vbias" are the dI/dV differential conductance data. In the "Comments" of the workbook, the value of the magnetic field is labeled. Inside the ManuscriptFigures3-29-24.opju file, the folder "7nm Te Data" shows the tunneling results of the thick 15nm Au(111) sample. The "2021-04-23 Tunneling" folder shows the tunneling data of the 5nm Au(111) sample. The folder "20210423" shows the transport measurement, for example, the critical field, of the 5nm Au(111) sample. The folder "Pauli Limited Data" shows the Pauli limit measurements of the samples with varying Au and Nb thickness. The "GIXRD data.zip" file contains all grazing incidence x-ray diffraction data. Inside the zip file, the "2tw_110_fitting_export.txt" shows the high-resolution 2theta-omega scan of the sample. Each column is labeled in the .txt file, for example, "Intensity, cps 2theta" means the intensity measured as counts per second, etc. The "PF_Au200_export.txt" shows the pole figure data of the sample. The "XRR_fitting_export.txt" shows the grazing incidence x-ray reflectivity data. The "resonator data.opju" file contains all microwave resonator data. The workbook for example "S21:-12dbm" shows the microwave absorption result of a resonator under certain power, which corresponds to the number of microwave photons. The first column is the microwave frequency, and the second column is the real part and imaginary part (third column) of the measurement. The workbook for example "R1_4p0.asc" is the fitting result of the first resonator on the chip. Each column is labeled in the workbook. The "231227A:100nmNb" workbook shows the result of the 100nm Nb as a reference sample. The data can be accessed using standard Origin software. The raw data is combined into an OriginPro project file and can be viewed with OriginViewer. Once opened, one can use the standard functions in Origin software to access the data, plot them, and view the results.