Event Details

Electron tunneling spectroscopy of the Kitaev honeycomb crystal α -RuCl3 and optical characterisation of its proximity to WSe2 by Dr Servet Ozdemir of the Institute of Photonics and Quantum Sciences, Heriot-Watt University

ABSTRACT: Being a layered crystal, α-RuCl₃ has been attracting a lot of interest as a honeycomb system that is described by a Kitaev Hamiltonian where a quantum spin liquid phase with Majorana excitations, a thermal quantum Hall effect, as well as an anti-ferromagnetic order emerging below 7-12K has been demonstrated. So far, as a layered system which is a dielectric at low temperatures, studies of van der Waals heterostructures of α-RuCl₃ has been limited to graphene / exfoliated few layer α-RuCl₃ systems where a charge transfer has been observed. In this talk I will present tunnelling spectroscopy results across bilayer α-RuCl₃ crystal assembled into a van der Waals heterostructure, where I will show evidence of an antiferromagnetic transition taking place at temperature range of 7-12K, through both observed hysteresis of the tunnel junction resistance as a function of magnetic field and the magnon features in the second derivative of the tunnelling I-V curves. Additionally, I will also discuss experiments on optical characterisation of a WSe₂ crystal in proximity to α-RuCl₃, where several effects on the optical properties have been observed.

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