ELFT HÍRADÓ

[tcsaba AT eik.bme.hu]

                    M E G H Í V Ó - I N V I T A T I O N

      Seminar series of the Department of Theoretical Physics at the
            Budapest University of Technology and Economics


                               Péter Rakyta
         (Department of Physics of Complex Systems, Eötvös University)

  Study of ballistic quantum antidots and dots situated in magnetic field


Quantum dots and antidots made of two-dimensional materials are often  
used to design novel nanoscale devices due to their peculiar physical
properties. For example, silicene manifests a remarkable intrinsic  
spin-orbit interaction that triggers a topological phase transition in  
the
low-energy regime. We found that the protected edge states present in  
silicene antidots and dots are polarized in valley-spin pairs. Our  
calculations
also confirmed that the topological edge states are propagating over  
the perimeter of the antidot/dot for both ideal or realistic edge  
termination
containing roughness on the atomic length scale.
Here we also propose an experimental method for the detection of bound  
states around an antidot formed from a hole in a graphene sheet by  
measuring
the ballistic two terminal conductances. In particular, we consider  
the effect of bound states formed by magnetic field on the two terminal
conductance and show that one can observe Breit-Wigner like resonances  
in the conductance as a function of the Fermi level close to the  
energies of
the bound states.


Idöpont: 2016. február 19., 10:15
Helyszín: BME Fizikai Intézet, Elméleti Fizika Tanszék,
Budafoki út 8. F-épület, III lépcsöház, szemináriumi szoba


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