[MSE Speicial Seminar] Prof. Long Ju (MIT / Department of Physics)

2022.07.21
808

제목

Tunable electron topology and correlation in few-layer rhombohedral graphene

날짜

2022. 7. 22 (Fri), 4PM

연사

Prof. Long Ju (MIT / Department of Physics)

장소

- Online : https://kaist.zoom.us/j/84295497925 - Offline : #1318, W1-1 Bd. 1F

개요:

Tunable electron topology and correlation in few-layer rhombohedral graphene

O Speaker: Prof. Long Ju (MIT / Department of Physics)

O Title: Tunable electron topology and correlation in few-layer rhombohedral graphene

O Date: 2022. 7. 22 (Fri)

O Start Time: 4PM

O Venue:

– Online : https://kaist.zoom.us/j/84295497925

– Offline : #1318, W1-1 Bd. 1F

O Host : Prof. Kang, Kibum

O Abstract : Graphene has been a model solid state system where novel quantum phenomena emerge from the interplay between symmetry, band topology and reduced dimensionality. In particular, few layer graphene with the rhombohedral stacking order has a unique bandstructure with an electrically tunable bandgap and a valley-dependent Berry phase.

These features result in unusual electrical and optical properties, for which optical spectroscopy/microscopy are powerful characterization tools.

In this talk, I will first show our experimental demonstration of the topological valley transport at AB/BA stacking domain walls in bilayer graphene. These domain walls are 1D conducting channels that feature the quantum valley Hall edge states.

Next, I will present our efforts on probing the orbital magnetism of electrons through studying excitons in bandgap-tuned bilayer graphene. Due to the electron pseudospin and Berry curvature effects, these excitons obey unusual valley-dependent optical selection rules and a large valley g-factor of 20 in magnetic field.

Finally, I will show our recent work on probing strong electron correlation in ABC trilayer graphene and its implications for correlation-driven topological phenomena.

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