Research Student Presentation

Dear All, 

DEPARTMENT OF INSTRUMENTATION AND APPLIED PHYSICS 

                                         Research Student Presentation

 NAME OF THE CANDIDATE                      :   Ms. Radhika Soni

 DEGREE                                                             :   Ph.D

TITLE OF THE?PRESENTATION              :    Electron tunneling and Inter layer coupling in van der Waals heterostructures

SUPERVISOR                                                    :    Dr. Chandni. U

 DATE & TIME                                                   :    Wednesday, 27th?November 2019 @ 2.30 PM. 
 
VENUE                                                                 :    Seminar Hall, Dept. of Instrumentation and Applied Physics

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                                                                                Abstract

Quantum tunneling is a phenomenon which has excited physicists over many decades. With the ability to extract 2D materials from the bulk such as graphene and hBN, experiments showcasing this exceptional quantum mechanical phenomenon are now feasible in low dimensional systems. Some of the earlier work includes demonstration of electron tunneling from metal into a graphene/graphite sheet using few atomic layers of hexagonal boron nitride (hBN) as tunnel barrier. Also, it was theoretically predicted that graphene layers are strongly coupled near magic angles. As a result of this the electronic band structure near zero Fermi energy becomes flat. Subsequently, there were experimental reports of strong correlation between graphene layers at an angle near to ‘magic angle’.

Here, I plan to discuss electron tunneling and inter layer coupling using two types of devices. The first one being a graphene-hBN-graphene device. It is based on the principle that for electrons to tunnel between two graphene sheets elastically, there should be no momentum mismatch. Thus, when the two graphene sheets are completely aligned to each other, we should see a tunnel current; hBN being the tunnel barrier. Further, it was theoretically predicted that the graphene layers are strongly correlated at angles near ‘magic angle’. My focus would be to demonstrate electron tunneling through a metal-hBN-Twisted Bilayer Graphene (TBLG) device when the graphene layers are strongly correlated near the magic angle.

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                                                    ALL ARE WELCOME

                                                                                                        CHAIRMAN

Date/Time
Date(s) - 27/11/2019
2:30 pm - 3:30 pm

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