Strain driven emergence of topological non-triviality in YPdBi thin films
journal contributionposted on 26.04.2021, 10:13 by Vishal Bhardwaj, Anupam Bhattacharya, Shivangi Srivastava, Vladimir V. Khovaylo, Jhuma Sannigrahi, Niladri Banerjee, Brajesh K. Mani, Ratnamala Chatterjee
Half-Heusler compounds exhibit a remarkable variety of emergent properties such as heavy-fermion behaviour, unconventional superconductivity and magnetism. Several of these compounds have been predicted to host topologically non-trivial electronic structures. Remarkably, recent theoretical studies have indicated the possibility to induce non-trivial topological surface states in an otherwise trivial half-Heusler system by strain engineering. Here, using magneto-transport measurements and first principles DFT-based simulations, we demonstrate topological surface states on strained  oriented thin films of YPdBi grown on (100) MgO. These topological surface states arise in an otherwise trivial semi-metal purely driven by strain. Furthermore, we observe the onset of superconductivity in these strained films highlighting the possibility of engineering a topological superconducting state. Our results demonstrate the critical role played by strain in engineering novel topological states in thin film systems for developing next-generation spintronic devices.
SPARC proposal #754
Spin-Orbit Coupling-Driven Superconducting Spintronics
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