ELFT HÍRADÓ

[Balazs Dora <dora AT kapica.phy.bme.hu>]

                            MEGHIVO
      a BME Fizikai Intezet, Egzotikus kvantum fazisok csoport
                         szeminariumara:


                        Doru Sticlet (MPIPKS, Dresden)
   "Multiplication of topological phases in two-band tight-binding models"


Insulators and superconductors characterized by a Z topological invariant
allow phases which exhibit any number of protected edge states. To uncover 
these phases it is not always necessary to consider multiband materials.
We show that they can be realized in two-band tight-binding models with
distant-site couplings. This is exemplified with two cases: a 
two-dimensional Chern insulator - the Haldane model, and a 1D chiral 
superconductor supporting Majorana bound states. We also discuss some 
implications due to the presence of multiple Majorana edge states in the 
1D chain.

References:
F.D.M. Haldane, Phys. Rev. Lett., 61, 2015 (1988)
S. Ryu, A. Schnyder, A. Furusaki & A.W.W. Ludwig, New J. Phys., 12, 065010
(2010)
Y. Niu, S.B. Chung, C.-H. Hsu, I. Mandal, S. Raghu & S. Chakravarty, Phys.
Rev. B, 85, 035110 (2012)
S. Tewari & J.D. Sau, Phys. Rev. Lett. 109, 150408 (2012)
D. Sticlet & F. Piechon, Phys. Rev. B, 87, 115402 (2013)
D. Sticlet, C. Bena & P. Simon, Phys. Rev. B, 87, 104509 (2013)

       Helye: BME Fizikai Intezet,
              Elmeleti Fizika Tanszek
              Budafoki ut 8.
              Szeminariumi szoba
       Ideje: 2013. aprilis 8. hetfo, 14:15.


 Minden erdeklodot szivesen latunk.

        Dora Balazs