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March 20, 2023 past

Condensed Atomic Molecular Physics (CAMP) Seminar - Quantum Phenomena in the Landau Levels of Atomically-Thin Transition Metal Dicalcogenides

Zoom: https://psu.zoom.us/j/96178311702?pwd=bWNHRXE5QUdkbTVEY1F3dFlhR3JvZz09

Condensed Atomic Molecular Physics (CAMP) Seminar - Quantum Phenomena in the Landau Levels of Atomically-Thin Transition Metal Dicalcogenides

Landau levels offer a neat model system to study emergent quantum phases, owing to the dominating Coulomb interactions and tunable orbital wavefunctions. In atomically-thin transition metal dicalcogenide, the well-resolved and -controlled spin, valley and layer degree of freedom further enriches the physics that can be explored. In this talk, I’ll discuss a few examples in WSe2: first, a bilayer WSe2 allows selective carrier population of the individual layers; when the filling factor of the two layers is an integer number, it manifests as a natural platform for interlayer exciton condensate. Second, a large imbalance in the population of two (pseudo)spins gives rise to spin-dependent transport in partially filled Landau levels - the spin-minority carriers are much less mobile than the spin-majority carriers. We explain such behavior using a polaron picture.

Program

Date Time Speaker Title
2023-03-20 15:45 Qianhui Shi Quantum Phenomena in the Landau Levels of Atomically-thin Transition Metal Dicalcogenides
About our wordmark
Monica Rincon Ramirez

The IGC wordmark was created by Monica Rincon Ramirez while she was a graduate student at the Institute. Monica enjoys drawing new connections between fundamental theory and observations. Her graduate work included general relativity, loop quantum gravity, and quantum fields in cosmological backgrounds; her thesis focused on effective quantum corrections to gravitational phenomena from spinfoams and applications to cosmology. She received her PhD in 2024.

The wordmark symbolizes the scope of research at the IGC. The base represents quantum gravity, evoking the quantum geometrical picture from spinfoams and loop quantum gravity — approaches studied at the Center for Fundamental Theory. The middle shows galaxies embedded in a smooth surface characteristic of spacetime in general relativity and the larger physical scales studied at the Center for Theoretical and Observational Cosmology. The top curves to an extreme representing a supermassive black hole accompanied by an energetic jet, with a binary black hole pair nearby — the high-energy phenomena studied at the Center for Multimessenger Astrophysics.