Journal Article

FZJ-2019-05090

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Magnetic field dependence of the thermopower of Kondo-correlated quantum dots

Costi, T. A. (Corresponding author)FZJ*

2019
Inst. Woodbury, NY

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Please use a persistent id in citations: http://hdl.handle.net/2128/23103  doi:10.1103/PhysRevB.100.161106

Abstract: 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

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Contributing Institute(s):

1. Theoretische Nanoelektronik (IAS-3)
2. JARA - HPC (JARA-HPC)

Research Program(s):

1. 142 - Controlling Spin-Based Phenomena (POF3-142) (POF3-142)
2. 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) (jiff23_20181101)

Appears in the scientific report 2019

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Web of Science Core Collection

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