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[Fizinfo] BME Elméleti Fizika Tanszék szemináriuma - rendhagyó időpont!

Chronological Thread 
  • From: tcsaba AT
  • To: fizinfo AT
  • Subject: [Fizinfo] BME Elméleti Fizika Tanszék szemináriuma - rendhagyó időpont!
  • Date: Tue, 19 May 2015 16:30:41 +0200


a BME Fizikai Intézete Elméleti Fizika Tanszékének


J. Cayssol
(LOMA and Université de Bordeaux)

"Persistent and dissipative currents around
two-dimensional topological insulators"

Quantum spin Hall insulators are two-dimensional band insulators characterized by protected counter-propagating one-dimensional (1D) metallic edge states. This 1D edge metal is unique because the spin of its carriers is tied to their direction of motion, and backscattering between right and left movers is forbidden by time-reversal symmetry. I will describe the response of these helical edge states under flux biasing. For a static flux, the edge Dirac fermions carry a persistent current which is robust to non magnetic disorder [1]. For time-dependent flux biasing, the response of the 1D helical liquid is characterized by a complex susceptibility. The relaxation time of the edge carriers can be determined from a measurement of the dissipative part of this susceptibility [2]. The effects of various perturbations, including Zeeman coupling and disorder, will also be discussed. In conclusion, I will also discuss briefly the connection with the Floquet topological insulators with photo induced edge states [3].

[1] D. Sticlet and J. Cayssol, Phys. Rev. B 90, 201303 (2014).
[2] D. Sticlet, B. Dóra, and J. Cayssol, Phys. Rev. B 88, 205401 (2013).
[3] J. Cayssol, B. Dóra, F. Simon, and R. Moessner, Phys. Status Solidi RRL, 7, 101 (2013).

Helye: BME Fizikai Intézet, Elméleti Fizika Tanszék
Budafoki út 8. F-épület, III lépcsöház
Szemináriumi szoba

Ideje: 2015. május 28. csütörtök, 13:15.

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