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Caltech

Quantum Matter Seminar

Monday, January 30, 2023
4:00pm to 5:00pm
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East Bridge 114
Nano-optical probe of van der Waals interfaces
Dmitri N Basov, Professor, Department of Physics, Columbia University,

Van der Waals (vdW) interfaces are emerging as a versatile platform to control and investigate electronic, magnetic and optical properties of quantum materials. I will discuss nano-optical studies of charge transfer across an interface of vdW materials with different work functions. Charge transfer between graphene and a-RuCl3 (a candidate Kitaev spin liquid material) prompts metallicity in the graphene layer. We also observed indications for the electronic response in a-RuCl3 initiated by charge transfer with graphene. We implemented a complementary class of charge-transfer structure produced oxidation of vdW monolayers of WSe2 and ZrSe2. These latter structures reveal ambipolar charge transfer along with prominent plasmonic effects in graphene. If time permits, I will also discuss negative refraction of polaritonic waves at the interface of two vdW materials hBN and MoO3. All these experiments were enabled by nano-optical instrumentation developed in our group at Columbia.

For more information, please contact Loly Ekmekjian by email at [email protected].