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TT: Fachverband Tiefe Temperaturen

TT 11: Quantum Impurities, Kondo Physics

TT 11.9: Talk

Tuesday, March 27, 2007, 11:45–12:00, H19

Matrix product state approach for a two-lead Anderson model — •Andreas Holzner^1,2, Andreas Weichselbaum¹, and Jan von Delft¹ — ¹LMU München, Lehrstuhl für Theoretische Festkörperphysik, Theresienstraße 37, D-80333 München, Germany — ²Institut für Theoretische Physik C, RWTH Aachen, D-52056 Aachen, Germany

Both NRG and DMRG can be formulated using the matrix product state (MPS) formalism. Using this common basis, we apply DMRG techniques to the Anderson model after mapping the leads to Wilson-chains as in NRG. For calculating the ground state properties this method proves to be more efficient and more flexible than NRG. In this sense more complex systems are accessible. Specifically, we map a two-lead Anderson model onto a quasi-1-dimensional star geometry upon which we sweep similar in style to 1-site finite-size DMRG. We present results for the groundstate occupation of a spinful 4-level quantum dot.