[institut] SCL Seminar: Vladimir Juricic, petak 29. mart u 11:00

[Nenad Vukmirovic]

Postovane koleginice i kolege,

Pozivam vas na seminar koji ce u petak 29. marta 2013. godine u 11:00 u 
citaonici Instituta za fiziku odrzati Vladimir Juricic sa Univerziteta u 
Lajdenu. Naslov seminara i apstrakt su dati u nastavku ove poruke.

Title: The Space Group Classification of Topological Band-Insulators

Abstract:

Topological band insulators are bulk insulating states of matter which 
in the presence of time-reversal invariance feature metallic states at 
their edge or surface [1]. This state of quantum matter has been 
recently experimentally realized in the HgTe quantum wells.

I will first introduce the concept of topological band insulators and 
then discuss the role of crystal symmetries in the physics of these 
states of quantum matter. I will derive the classification of 
topological band insulators protected not only by time-reversal, but 
also by space group symmetries [2]. I will show that there are three 
broad classes of topological states: (a) Gamma-states robust against 
general time-reversal invariant perturbations; (b) 
Translationally-active states protected from elastic scattering, but 
susceptible to topological crystalline disorder; (c) Valley 
(crystalline) topological insulators sensitive to both non-topological 
and crystalline disorder. I will show how some of these states can be 
realized in two dimensions when the tight-binding M-B model, originally 
introduced for the HgTe quantum wells, is generalized to include 
longer-range hoppings. I will also discuss probing of these states by 
magnetic pi-fluxes and lattice dislocations [3]. Finally, I will 
consider some experimental implications of our classification scheme.

[1] For recent reviews, see  M. Z. Hasan and C. L. Kane, Rev. Mod. Phys.
82, 3045 (2010); X. L. Qi and S. C. Zhang, Rev. Mod. Phys. 83, 1057
(2011).

[2] R.-J. Slager, A. Mesaros, V. Juricic, and J. Zaanen, Nature Physics 
9, 98 (2013).

[3] V. Juricic, A. Mesaros, R.-J. Slager, and J. Zaanen, Phys. Rev. 
Lett. 108, 106403 (2012).


Srdacan pozdrav,

-- 
Dr Nenad Vukmirovic,
Visi naucni saradnik,
Laboratorija za primenu racunara u nauci,
Institut za fiziku Beograd,
Srbija.
URL: http://www.scl.rs/nenad