Physics Colloquium

Thursday, January 26, 2023
4:00pm to 5:00pm
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Online and In-Person Event
Nano-optical probe of van der Waals interfaces
Dmitri Basov, Columbia University,

Biard Lecture

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.
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Meeting ID: 858 1199 4621

The colloquium is held in Feynman Lecture Hall, 201 E. Bridge.

In person is open to those with a valid Caltech ID.