ELFT HÍRADÓ

[StatFizSzeminar <statfiz AT glu.elte.hu>]

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                    ELTE TTK Fizikai Intézet
                STATISZTIKUS FIZIKAI SZEMINÁRIUM


                        2013. október 2.
                        szerda, 11 óra

                         Gábor Halász

Kavli Institute for Theoretical Physics, Santa Barbara, USA, 
 Rudolf Peierls Centre for Theoretical Physics, Oxford, UK

      "Weyl semimetals from topological insulators"

Topological phases of matter have recently become the objects of 
intense study in condensed matter physics. Among these novel phases 
are topological insulators, which have a band gap in the bulk like 
normal insulators, but support topologically-protected surface states 
in the gap. At the transition point between the normal and the 
topological insulator phases, the band gap in the bulk vanishes. 
If the time-reversal or the inversion symmetry is broken, this 
transition point can be turned into a transition phase - the Weyl 
semimetal phase - that is characterized by band touching points at 
the Fermi level. In our research, we proposed a time-reversal-invariant
realization of the Weyl semimetal phase, using both a simplified 
superlattice model and a realistic tight-binding model describing a 
concrete heterostructure. The most important physical properties of 
this phase are a strongly anisotropic conductivity and partially-
present surface states.


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