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@ARTICLE{Costi:865783,
      author       = {Costi, Theodoulos},
      title        = {{M}agnetic field dependence of the thermopower of
                      {K}ondo-correlated quantum dots: {C}omparison with
                      experiment},
      journal      = {Physical review / B},
      volume       = {100},
      number       = {15},
      issn         = {2469-9950},
      address      = {Woodbury, NY},
      publisher    = {Inst.},
      reportid     = {FZJ-2019-05091},
      pages        = {155126},
      year         = {2019},
      abstract     = {Signatures of the Kondo effect in the electrical
                      conductance of strongly correlated quantum dots are well
                      understood both experimentally and theoretically, while
                      those in the thermopower have been the subject of recent
                      interest, both theoretically and experimentally. Here, we
                      extend theoretical work [T. A. Costi, Phys. Rev. B 100,
                      161106 (2019)] on the field-dependent thermopower of such
                      systems to the mixed valence and empty orbital regimes, and
                      carry out calculations in order to address a recent
                      experiment on the field-dependent thermoelectric response of
                      Kondo-correlated quantum dots [A. Svilans et al., Phys. Rev.
                      Lett. 121, 206801 (2018)]. In addition to the sign changes
                      in the thermopower at temperatures T1(B) and T2(B) (present
                      also for B=0) in the Kondo regime, an additional sign change
                      was found [T. A. Costi, Phys. Rev. B (to be published)] at a
                      temperature T0(B)<T1(B)<T2(B) for fields exceeding a
                      gate-voltage-dependent value B0, where B0 is comparable to,
                      but larger than, the field Bc at which the Kondo resonance
                      splits. We describe the evolution of the Kondo-induced sign
                      changes in the thermopower at temperatures T0(B),T1(B), and
                      T2(B) with magnetic field and gate voltage from the Kondo
                      regime to the mixed valence and empty orbital regimes and
                      show that these temperatures merge to the single temperature
                      T0(B) upon entry into the mixed valence regime. By carrying
                      out detailed numerical renormalization group calculations
                      for the above quantities, using appropriate experimental
                      parameters, we address a recent experiment which measures
                      the field-dependent thermoelectric response of InAs quantum
                      dots exhibiting the Kondo effect [A. Svilans et al., Phys.
                      Rev. Lett. 121, 206801 (2018)]. This allows us to understand
                      the overall trends in the measured field- and
                      temperature-dependent thermoelectric response as a function
                      of gate voltage. In addition, we determine which signatures
                      of the Kondo effect [sign changes at T0(B),T1(B), and T2(B)]
                      have been observed in this experiment, and find that while
                      the Kondo-induced signature at T1(B) is indeed measured in
                      the data, the signature at T0(B) can only be observed by
                      carrying out further measurements at a lower temperature. In
                      addition, the less interesting (high-temperature) signature
                      at T2(B)≳Γ, where Γ is the electron tunneling rate onto
                      the dot, is found to lie above the highest temperature in
                      the experiment, and was therefore not accessed. Our
                      calculations provide a useful framework for interpreting
                      future experiments on direct measurements of the thermopower
                      of Kondo-correlated quantum dots in the presence of finite
                      magnetic fields, e.g., by extending zero-field measurements
                      of the thermopower [B. Dutta et al., Nano Lett. 19, 506
                      (2019).] to finite magnetic fields.},
      cin          = {IAS-3 / JARA-HPC},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IAS-3-20090406 / $I:(DE-82)080012_20140620$},
      pnm          = {142 - Controlling Spin-Based Phenomena (POF3-142) /
                      Application of the (time-dependent) numerical
                      renormalization group approach to thermoelectric properties
                      of (driven) quantum dots and to time-resolved spectroscopy
                      of correlated materials $(jiff23_20181101)$},
      pid          = {G:(DE-HGF)POF3-142 / $G:(DE-Juel1)jiff23_20181101$},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000490168200002},
      doi          = {10.1103/PhysRevB.100.155126},
      url          = {https://juser.fz-juelich.de/record/865783},
}