Skip to main content

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

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

2023-03-20

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.

TimeSpeakerTitle
15:45Qianhui ShiQuantum Phenomena in the Landau Levels of Atomically-thin Transition Metal Dicalcogenides
About our wordmark
Monica The IGC wordmark was created by Monica Rincon Ramirez, while she was a graduate student at the Institute for Gravitation and the Cosmos (IGC). Monica enjoys drawing new connections between fundamental theory and observations. Her graduate work includes specialized topics in general relativity, loop quantum gravity, and quantum fields in cosmological backgrounds. In particular, her thesis work focused on finding effective quantum corrections to gravitational phenomena from spinfoams, and applications to cosmology. She received her PhD in 2024.

The wordmark symbolizes the scope and variety of research at the IGC. The base of the image represents quantum gravity, evoking the quantum geometrical picture from spinfoams and loop quantum gravity. These are among the approaches to fundamental questions studied at the Center for Fundamental Theory. The middle of the image represents the Center for Theoretical and Observational Cosmology by galaxies embedded in a smooth surface, characteristic of spacetime in general relativity and the much larger physical scales studied in cosmology. Finally, at the top, the surface curves to an extreme, representing a supermassive black hole accompanied by an energetic jet. These elements depict an active galactic nucleus, inspired by Centaurus A. Just to the right, a pair of black holes approaches merger. This top portion of the wordmark represents the Center for Multimessenger Astrophysics, which specializes in the study of high-energy phenomena in the universe.