ELFT HÍRADÓ

[Andras Palyi <andraspalyi AT caesar.elte.hu>]

Kedves Kollégák!

2016. szeptember 20-án kedden 14:15-től Baruch Horovitz (Ben Gurion 
University of the Negev, Izrael) tart előadást a BME Fizikai Intézetében. 
Előadásának címe:

"Floquet topological phases coupled to environments and the induced 
photocurrent”

Az előadás helyszíne a BME Elméleti Fizika Tanszék szemináriumi szobája. (BME 
F épület 3. lépcsőház, magasföldszint)

Kivonat: 
“We consider the fate of a helical edge state of a spin Hall insulator and 
its topological transition in presence of a circularly polarized light when 
coupled to various forms of environments. A Lindblad type equation is 
developed to determine the fermion occupation of the Floquet bands. We find 
by using analytical and numerical methods that non-secular terms, 
corresponding to 2-photon transitions, lead to a mixing of the band 
occupations, hence the light induced photocurrent is in general not perfectly 
quantized in the presence of finite coupling to the environment, although 
deviations are small in the adiabatic limit. Sharp crossovers are identified 
at frequencies Omega and Omega/2 (Omega is the strength of light-matter 
coupling) with the former resembling to a phase transition."

Minden érdeklődőt szeretettel várunk.

Üdvözlettel,
Pályi András