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Two aspects of dirac fermions: Electron optics and unconventional band structure due to bound states.

Speaker: 
Sankalpa Ghosh (Indian Institute of Technology, Delhi)
Date: 
Wed, 09/12/2015 - 2:00pm to 3:00pm
Location: 
S16-06 (CA2DM Theory Common Seminar Room)
Host: 
Feng Yuan Ping
Event Type: 
Seminars

Abstract

Two aspects of dirac fermions: Electron optics and unconventional band structure due to bound states. Abstract: The talk has two parts. In the first part we shall describe our last few years' work on optical analogy of ballistic electron transport in monolayer and bilayer Graphene. We shall particularly emphasize the electron transport through magnetic barriers, their super lattice under various circumstances and how optical analogy helps us to model such transport. In the second part of the talk we shall describe our recent work on the unconventional band structure of dirac fermions on the surface of three dimensional Topological Insulators due to formation of "bound states in a potential barrier". We particularly point out how it can lead to interesting application in fields like Spintronics.

Main references:

1. Neetu Agrawal (Garg), Sankalpa Ghosh, and Manish Sharma, Int. J. Mod. Phys. B 27, 1341003 (2013).
2. Manish Sharma and Sankalpa Ghosh, J. Phys.: Condens. Matter 23 055501 (2011).
3. Sankalpa Ghosh and Manish Sharma, J. Phys.: Condensed Matter 21, 292204 (2009).
4. Neetu Agrawal (Garg) et al, J. Phys.: Condens. Matter 24, 175003 (2012).
5. Neetu Agrawal Garg, Sankalpa Ghosh and Manish Sharma, EPJB 86, 317 (2013).
6. Puja Mondal and Sankalpa Ghosh, J. Phys.: Condensed Matter (in press) (arxiv: 1411.2091)

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