Twist and Texture in Bilayer Graphene
Event details
| Date | 31.10.2014 |
| Hour | 14:15 |
| Speaker | Prof. Eugene Mele, Department of Physics, David Rittenhouse Labs, University of Pennsylvania |
| Location | |
| Category | Conferences - Seminars |
Multilayer graphenes feature special functionalities that microscopically arise from the atomic registry when graphene sheets are stacked. These depend on relative lateral translations, rotations and layer symmetry breaking that can occur spontaneously or be induced. This talk will focus on bilayer graphenes (BLG) in which the stacking arrangement varies in space. We examine domain walls where the local stacking order switches from local AB to BA registry, and study the electronic modes at the boundary by analyzing their four band continuum models augmented by numerical calculations on the lattice. We then consider the more general family of two dimensional strain-minimizing BLG stacking textures, showing that they are twisted textures of the interlayer displacement field. We study the interactions and composition rules for these elementary textures which permit a unified treatment of stacking point defects, domain walls and twisted graphenes.
Bio: Associate Chair for Undergraduate Affairs, Department of Physics, University of Pennsylvania (1998- 2002)
Professor of Physics, University of Pennsylvania (since 1989)
Associate Professor of Physics, University of Pennsylvania (1985-1989)
Assistant Professor of Physics, University of Pennsylvania (1981-1985)
Associate Scientist, Xerox Webster Research Center, Webster, NY (1978-1981)
Postdoctoral Associate, Department of Physics, Massachusetts Institute of Technology (1978)
Research Assistant, Department of Physics, Massachusetts Institute of Technology (1975-1978)
Honors include:
Europhysics Prize of the European Physical Society (2010)
Christian R. and Mary F. Lindback Award for Distinguished Teaching, University of Pennsylvania (2010)
Fellow of the American Physical Society (2001)
Ira Abrams Award for Distinguished Teaching, School of Arts and Sciences, University of Pennsylvania (1998)
Alfred P. Sloan Fellow (1983-1987)
National Science Foundation Graduate Fellow (1972-1975)
Bio: Associate Chair for Undergraduate Affairs, Department of Physics, University of Pennsylvania (1998- 2002)
Professor of Physics, University of Pennsylvania (since 1989)
Associate Professor of Physics, University of Pennsylvania (1985-1989)
Assistant Professor of Physics, University of Pennsylvania (1981-1985)
Associate Scientist, Xerox Webster Research Center, Webster, NY (1978-1981)
Postdoctoral Associate, Department of Physics, Massachusetts Institute of Technology (1978)
Research Assistant, Department of Physics, Massachusetts Institute of Technology (1975-1978)
Honors include:
Europhysics Prize of the European Physical Society (2010)
Christian R. and Mary F. Lindback Award for Distinguished Teaching, University of Pennsylvania (2010)
Fellow of the American Physical Society (2001)
Ira Abrams Award for Distinguished Teaching, School of Arts and Sciences, University of Pennsylvania (1998)
Alfred P. Sloan Fellow (1983-1987)
National Science Foundation Graduate Fellow (1972-1975)
Practical information
- Informed public
- Free
Organizer
- ICMP (Arnaud Magrez and Raphaël Butté)