Condensed Matter Seminar

Spectroscopic and transport signatures of one-dimensional spinon liquid

Abstract: 

Quasiparticles of the Heisenberg spin-1/2 chain — spinons — represent the best experimentally accessible example of fractionalized excitations known to date. Dynamic spin response of the spin chain is typically dominated by the broad multi-spinon continuum that often masks subtle features, such as continuum edge singularities, induced by the interaction between spinons. This, however, is not the case in the small momentum region of the magnetized spin chain where strong interaction between spinons leads to qualitative changes to the response.

Controlling Emission Wavelength and Chirality of Quantum Emitters in 2D Heterostructures

Abstract:
In this talk I will provide a brief overview of two recent accomplishments in my group toward achieving quantum emitters capable of operating in telecommunication wavelength and generating circularly polarized single photons without the need of external magnetic field and spin polarized injection of carriers/excitons.  
 

Moiré magnetism: a synergy between flatlands

Abstract:
Graphene is not the only two-dimensional material with far-reaching significance. It falls into the category of van der Waals (vdW) materials which can be exfoliated down to atomically thin monolayers. Thousands of them have been created and can be further assembled into designer heterostructures like quantum Lego. Stackings can induce moiré patterns, sparking major efforts in the studies of resultant new electronic phenomena in vdW heterostructures.

Let’s get real – Adapting the toolkit of many-body theory to realistic materials simulation

Abstract
Quantum many-body theories, including diagrammatic perturbation theory and non-perturbative embedding theories, are rigorous and well-developed theories used to describe the physics of many interacting particles in solids. They are typically applied to lattice model systems that capture only the essential degrees of freedom.

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