This title appears in the Scientific Report :
2019
Please use the identifier:
http://dx.doi.org/10.1103/PhysRevB.100.161106 in citations.
Please use the identifier: http://hdl.handle.net/2128/23103 in citations.
Magnetic field dependence of the thermopower of Kondo-correlated quantum dots
Magnetic field dependence of the thermopower of Kondo-correlated quantum dots
Recent experiments have measured the signatures of the Kondo effect in the zero-field thermopower of strongly correlated quantum dots [Svilans et al., Phys. Rev. Lett. 121, 206801 (2018); Dutta et al., Nano Lett. 19, 506 (2019)]. They confirm the predicted Kondo-induced sign change in the thermopowe...
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Personal Name(s): | Costi, T. A. (Corresponding author) |
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Contributing Institute: |
JARA - HPC; JARA-HPC Theoretische Nanoelektronik; IAS-3 |
Published in: | Physical Review B Physical review / B, 100 100 (2019 2019) 16 16, S. 161106 161106 |
Imprint: |
Woodbury, NY
Inst.
2019
|
DOI: |
10.1103/PhysRevB.100.161106 |
Document Type: |
Journal Article |
Research Program: |
Application of the (time-dependent) numerical renormalization group approach to thermoelectric properties of (driven) quantum dots and to time-resolved spectroscopy of correlated materials Controlling Spin-Based Phenomena |
Link: |
OpenAccess OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://hdl.handle.net/2128/23103 in citations.
Recent experiments have measured the signatures of the Kondo effect in the zero-field thermopower of strongly correlated quantum dots [Svilans et al., Phys. Rev. Lett. 121, 206801 (2018); Dutta et al., Nano Lett. 19, 506 (2019)]. They confirm the predicted Kondo-induced sign change in the thermopower, upon increasing the temperature through a gate-voltage dependent value T1≳TK, where TK is the Kondo temperature. Here, we use the numerical renormalization group (NRG) method to investigate the effect of a finite magnetic field B on the thermopower of such quantum dots. We show that, for fields B exceeding a gate-voltage dependent value B0, an additional sign change takes place in the Kondo regime at a temperature T0(B≥B0)>0 with T0<T1. The field B0 is comparable to, but larger than, the field Bc at which the zero-temperature spectral function splits in a magnetic field. The validity of the NRG results for B0 are checked by comparison with asymptotically exact higher-order Fermi-liquid calculations [Oguri and Hewson, Phys. Rev. B 97, 035435 (2018)]. Our calculations clarify the field-dependent signatures of the Kondo effect in the thermopower of Kondo-correlated quantum dots and explain the recently measured trends in the B-field dependence of the thermoelectric response of such systems |