Haver, S A; Ginossar, E; de Graaf, S E; Grosfeld, E (2023) Electromagnetic response of the surface states of a topological insulator nanowire embedded within a resonator. Communications Physics, 6. 101

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Abstract

Exploring the interplay between topological phases and photons opens new avenues for investigating novel quantum states. Here we show that superconducting resonators can serve as sensitive probes for properties of topological insulator nanowires (TINWs) embedded within them. By combining a static, controllable magnetic flux threading the TINW with an additional oscillating electromagnetic field applied perpendicularly, we show that orbital resonances can be generated and are reflected in periodic changes of the Q-factor of the resonator as a function of the flux. This response probes the confinement of the two dimensional Dirac orbitals on the surface of the TINW, revealing their density of states and specific transition rules, as well as their dependence on the applied flux. Our approach represents a promising cross-disciplinary strategy for probing topological solid state materials using state-of-the-art photonic cavities, which would avoid the need for attaching contacts, thereby enabling access to electronic properties closer to the pristine topological states.

Item Type:	Article
Keywords:	Topological insulator; electron spin resonance; superconducting resonator
Subjects:	Quantum Phenomena > Quantum Information Processing and Communication
Divisions:	Quantum Technologies
Identification number/DOI:	10.1038/s42005-023-01209-w
Last Modified:	14 Nov 2023 14:37
URI:	https://eprintspublications.npl.co.uk/id/eprint/9860