Ontology type: schema:ScholarlyArticle Open Access: True
2013-09-02
AUTHORSAavishkar A. Patel, Shraddha Sharma, Amit Dutta
ABSTRACTWe study the dynamics of edge states of the two dimensional BHZ Hamiltonian in a ribbon geometry following a sudden quench to the quantum critical point separating the topological insulator phase from the trivial insulator phase. The effective edge state Hamiltonian is a collection of decoupled qubit-like two-level systems which get coupled to bulk states following the quench. We notice a pronounced collapse and revival of the Lochschmidt echo for low-energy edge states illustrating the oscillation of the state between the two edges. We also observe a similar collapse and revival in the spin Hall current carried by these edge states, leading to a persistence of its time-averaged value. More... »
PAGES367
http://scigraph.springernature.com/pub.10.1140/epjb/e2013-40657-2
DOIhttp://dx.doi.org/10.1140/epjb/e2013-40657-2
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