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Response of incompressible fractional quantum Hall states to magnetic and non-magnetic impurities

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arxiv cond-mat/0703109 v1 pith:XGNDFCWA submitted 2007-03-05 cond-mat.mes-hall

Response of incompressible fractional quantum Hall states to magnetic and non-magnetic impurities

Karel V\'yborn\'y , Christian M\"uller , Daniela Pfannkuche This is my paper
classification cond-mat.mes-hall
keywords fractionalhallimpuritiesmagneticnon-magneticquantumresponsestates
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Using exact diagonalization we examine the response of several most prominent fractional quantum Hall states to a single local impurity. The 2/3 singlet state is found to be more inert than the polarized one in spite of its smaller incompressibility gap. Based on its spin-spin correlation functions we interpret it as a liquid of electron pairs with opposite spin. A comparison of different types of impurities, non-magnetic and magnetic, is presented.

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