Please use this identifier to cite or link to this item: https://scholarbank.nus.edu.sg/handle/10635/195576
Title: SPIN AND CHARGE TRANSPORT IN 2D MATERIALS AND VAN DER WAALS HETEROSTRUCTURES
Authors: HUANG JUNYE
ORCID iD:   orcid.org/0000-0001-7896-0595
Keywords: 2d materials, graphene, spintronics, superconductivity, majorana, quantum computing
Issue Date: 22-Jan-2021
Citation: HUANG JUNYE (2021-01-22). SPIN AND CHARGE TRANSPORT IN 2D MATERIALS AND VAN DER WAALS HETEROSTRUCTURES. ScholarBank@NUS Repository.
Abstract: This thesis focuses on the exploration of topological superconductivity in 2D materials and van der Waals heterostructures. Our approach is to realize topological superconductivity in Ising superconductors. A survey of different candidate materials systems for topological superconductivity is presented in this report. We will show that the Ising superconductor approach has many advantages over the forerunner approach — semiconductor/superconductor heterostructure. Preliminary results on a Ising superconductor NbSe2 are presented. Firstly, 2D superconductivity in ultra-thin NbSe2 is verified by fluctuation effects, square root dependence of in-plane upper critical field as well as BKT transition. Secondly, spin-polarized tunnel spectroscopy of NbSe2 is presented. The tunnel spectra strongly depend on the magnetization configuration of the tunnel contacts. The result is drastically different from a similar experiment on aluminium, suggesting the existence of spin supercurrent carried by spin-triplet Cooper pairs in NbSe2. Last but not least, the existence of spin supercurrent is further supported by non-local spin valve measurement. A clear spin signal of magnitude up to 4 Ω was observed. Spin lifetime and diffusion length were extracted from Hanle precession measurement to be 220 ps and 1.81 μm, respectively.
URI: https://scholarbank.nus.edu.sg/handle/10635/195576
Appears in Collections:Master's Theses (Open)

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