NDLI: Transport through quantum dots: a combined DMRG and embedded-cluster approximation study

Content Provider	Springer Nature Link
Author	Heidrich Meisner, F. Martins, G. B. Büsser, C. A. Al Hassanieh, K. A. Feiguin, A. E. Chiappe, G. Anda, E. V. Dagotto, E.
Copyright Year	2009
Abstract	The numerical analysis of strongly interacting nanostructures requires powerful techniques. Recently developed methods, such as the time-dependent density matrix renormalization group (tDMRG) approach or the embedded-cluster approximation (ECA), rely on the numerical solution of clusters of finite size. For the interpretation of numerical results, it is therefore crucial to understand finite-size effects in detail. In this work, we present a careful finite-size analysis for the examples of one quantum dot, as well as three serially connected quantum dots. Depending on “odd-even” effects, physically quite different results may emerge from clusters that do not differ much in their size. We provide a solution to a recent controversy over results obtained with ECA for three quantum dots. In particular, using the optimum clusters discussed in this paper, the parameter range in which ECA can reliably be applied is increased, as we show for the case of three quantum dots. As a practical procedure, we propose that a comparison of results for static quantities against those of quasi-exact methods, such as the ground-state density matrix renormalization group (DMRG) method or exact diagonalization, serves to identify the optimum cluster type. In the examples studied here, we find that to observe signatures of the Kondo effect in finite systems, the best clusters involving dots and leads must have a total z-component of the spin equal to zero.
Starting Page	527
Ending Page	542
Page Count	16
File Format	PDF
ISSN	14346028
Journal	The European Physical Journal B
Volume Number	67
Issue Number	4
e-ISSN	14346036
Language	English
Publisher	Springer-Verlag
Publisher Date	2009-02-10
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Superconductivity, Superfluidity, Quantum Fluids Solid State Physics and Spectroscopy Fluids Complexity Physics Condensed Matter
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Condensed Matter Physics

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