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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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