The European Physical Journal B

, Volume 67, Issue 4, pp 527–542 | Cite as

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

  • F. Heidrich-MeisnerEmail author
  • G. B. Martins
  • C. A. Büsser
  • K. A. Al-Hassanieh
  • A. E. Feiguin
  • G. Chiappe
  • E. V. Anda
  • E. Dagotto
Mesoscopic and Nanoscale Systems


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.


73.63.-b Electronic transport in nanoscale materials and structures 73.63.Kv Quantum dots 71.27.+a Strongly correlated electron systems; heavy fermions 


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Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2009

Authors and Affiliations

  • F. Heidrich-Meisner
    • 1
    • 2
    Email author
  • G. B. Martins
    • 3
  • C. A. Büsser
    • 3
    • 4
  • K. A. Al-Hassanieh
    • 1
    • 2
    • 5
    • 6
  • A. E. Feiguin
    • 7
    • 8
  • G. Chiappe
    • 9
    • 10
  • E. V. Anda
    • 11
  • E. Dagotto
    • 1
    • 2
  1. 1.Materials Science and Technology DivisionOak Ridge National LaboratoryOak RidgeUSA
  2. 2.Department of Physics and AstronomyUniversity of TennesseeKnoxvilleUSA
  3. 3.Department of PhysicsOakland UniversityRochesterUSA
  4. 4.Department of Physics and AstronomyOhio UniversityAthensUSA
  5. 5.National High Magnetic Field Laboratory and Department of Physics, Florida State UniversityTallahasseeUSA
  6. 6.Theoretical Division T-11Los Alamos National LaboratoryLos AlamosUSA
  7. 7.Microsoft Project Q, University of CaliforniaSanta BarbaraUSA
  8. 8.Condensed Matter Theory Center, Department of PhysicsUniversity of MarylandCollege ParkUSA
  9. 9.Departmento de Física J.J. GiambiagiUniversidad de Buenos AiresBuenos AiresArgentina
  10. 10.Departamento de Física AplicadaUniversidad de AlicanteAlicanteSpain
  11. 11.Departamento de FísicaPontificia Universidade Católica do Rio de JaneiroRio de JaneiroBrazil

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