Valley-spintronics in the moiré of van der Waals layered structures
Topological Mosaic in Moiré superlattices

Valley-spintronics in the moiré of van der Waals layered structures

Grapehene Centre Seminar with Wang Yao, Department of Physics and Center of Theoretical and Computational Physics, The University of Hong Kong

The Graphene Center at Chalmers (GCC) will organize a monthly GCC seminar on the recent advances in the field of graphene and 2D materials. The seminars will be on a monthly basis and will take place every last Monday in the month. ​

Welcome to attend!


Abstract:
In semiconducting transition metal dichalcogenides monolayers, the band edge carriers are described by massive Dirac cones, located at K and -K corners (valleys) of the Brillouin zone. The valley dependent properties of these massive Dirac fermions have enabled versatile control of the valley pseudospin in monolayers. Van der Waals stacking of the 2D semiconductors into vertical layered structures is a powerful approach towards designer quantum materials that can combine and extend the exotic properties of the building blocks. Ubiquitous to these vdW heterostructures is the formation of moiré́ pattern due to the inevitable lattice mismatch and twisting between the layers. We show that, uniquely for the valley massive Dirac fermions, the moiré offers unprecedented opportunities for nanoscale patterning of electronic, optical, magnetic, and topological properties. We give examples including: (i) electrically switchable lateral superstructures of topological insulators; (ii) moiré excitons for programmable arrays of quantum emitters; (iii) flux superlattice in twisted homobilayer.​
​​Coffee will be served outside Kollektorn from 12:40
Category Seminar; Lecture
Location: Kollektorn, lecture room, Kemivägen 9, MC2-huset
Starts: 27 May, 2019, 13:00
Ends: 27 May, 2019, 14:00

Published: Tue 08 Jan 2019. Modified: Fri 12 Apr 2019