ELFT HÍRADÓ

[Miklós Werner <wernermiklos AT gmail.com>]

A BME-MTA Egzotikus Kvantumfázisok csoport következő szemináriuma:

*Hetényi Balázs (BME, és Bilkent University (Törökország))*
"Topological phases in ladder models"

*Időpont és helyszín:*
2018. március 12. 14:15
*BME Fizikai Intézet Szemináriumi szoba* (F épület, 3. lépcsőház,
magasföldszint)

*Kivonat:*
"The recent developments in topological physics were motivated by two major
earlier developments, that of the Haldane and Kane-Mele models.  Both were
two-dimensional systems, hexagonal lattices.  In the former, time-reversal
and inversion symmetries were simultaneously broken, in such a way that an
effective mass changes sign at different Dirac points.  This model exhibits
quantized Hall conductance.  The latter coupled two Haldane models, one for
each spin-channel, and was the first model to exhibit quantized spin Hall
conductance.  In this talk, I will report our efforts to realize the
analogs of the above in one-dimension. In simple 1D systems are too
restricted, however, ladder models can be constructed to give analogs of
the Haldane and Kane-Mele models.  Our Haldane 1D analog model exhibits
topological behavior, and it also occurs as a result of the simultaneous
breaking of inversion and time-reversal symmetries.  The possible gap
closure points are symmetric around the origin, but their positions are
also tunable.  The topological index in this case is the mirror winding
number.  If time permits, I will also discuss the coupling of two modified
Creutz ladder models into a model which can be viewed as the 1D analog of
the Kane-Mele model."

Minden érdeklődőt szeretettel várunk.

A szemináriumsorozat további programja:
http://physics.bme.hu/seminar_eqp?language=en

Üdvözlettel,
Werner Miklós Antal