Condensed Matter Seminar

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.

Physics in Phonon Chirality

Abstract:
In this talk, I will discuss a number of basic issues associated with phonon chirality, such as the angular momentum carried by circularly polarized phonons, electronic magnetization induced by such phonons, and the creation of phonon chirality from time reversal symmetry breaking.  
 
 
Prof. Niu is a renown theoretical physicist and has made many pioneering contributions to studies of Berry phase effects, topological properties, and spin transport properties.

SPECIAL SEMINAR: Interlayer exciton phase transitions in atomically thin semiconductors

Semiconducting transition metal dichalcogenides (TMDs), when reduced to the two-dimensional (2D) limit, exhibit extraordinary excitonic effects that serve as a versatile platform for optoelectronic studies. Interlayer excitons, where the electron and hole are in separate layers, form dipolar composite bosons across the atomically-thin type-II heterostructures and offer a rich phase diagram for these interacting excitations. Here, we fabricate high-quality TMD heterostructure devices that allow us to have electrical control of interlayer excitons.

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