Condensed Matter Seminar

Physics in Phonon Chirality

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.

SPECIAL SEMINAR: The quantum sounds of electrons and the quantum noise of spinons

The problem of strongly interacting gapless fermions above one dimension is one of the wildest open frontiers in quantum condensed matter where our understanding remains insular and embedded in vast oceans of mystery. In this talk, I will describe certain islands of this knowledge dealing with the collective behaviour of strongly interacting Fermi surfaces of electrons and of spinons and describe new experimental strategies to probe them.


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