Nonlinear Seebeck effect of 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mtext>SU</mml:mtext><mml:mo>(</mml:mo><mml:mi>N</mml:mi><mml:mo>)</mml:mo></mml:math>
 Kondo impurity

Karki, D. B.; Kiselev, M. N.

doi:10.1103/physrevb.100.125426

Cited by 13 publications

(8 citation statements)

References 64 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Recently, the Kondo effect has attracted attention in the context of the thermoelectric response of gatetunable semiconductor and molecular quantum dots, both experimentally [24][25][26] and theoretically [27][28][29][30][31][32][33] . Understanding the thermoelectric properties of such systems is important for using nanoscale thermoelectric elements to improve the energy efficiency of microelectronic devices [34][35][36][37] .…”

Section: Introductionmentioning

confidence: 99%

Magnetic field dependence of the thermopower of Kondo-correlated quantum dots: Comparison with experiment

Costi

2019

Phys. Rev. B

View full text Add to dashboard Cite

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(R) (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 T 1 (B) and T 2 (B) (present also for B = 0) in the Kondo regime, an additional sign change was found [T. A. Costi, Phys. Rev. B 100, 161106(R) (2019)] at a temperature T 0 (B) < T 1 (B) < T 2 (B) for fields exceeding a gate-voltage dependent value B 0 , where B 0 is comparable to, but larger, than the field B c at which the Kondo resonance splits. We describe the evolution of the Kondo-induced sign changes in the thermopower at temperatures T 0 (B), T 1 (B) and T 2 (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 T 0 (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 T 0 (B), T 1 (B) and T 2 (B)) have been observed in this experiment, and find that while the Kondoinduced signature at T 1 (B) is indeed measured in the data, the signature at T 0 (B) can only be observed by carrying out further measurements at a lower temperature. In addition, the less interesting (high-temperature) signature at T 2 (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. arXiv:1910.08785v1 [cond-mat.str-el]

show abstract

Section: Introductionmentioning

confidence: 99%

Magnetic field dependence of the thermopower of Kondo-correlated quantum dots: Comparison with experiment

Costi

2019

Phys. Rev. B

View full text Add to dashboard Cite

show abstract

“…For 1CK effects, the transformation Eq. ( 10) effectively decouples the operators a from the impurity degrees of freedom [35,36] while the operator b remains interacting with impurity. In other word, while both of the operators a and b determines the non-interacting Hamiltonian, the scattering and interaction involves merely the operator b.…”

Section: A Low Energy Hamiltonian For Su (N ) Kondo Impurity and The ...mentioning

confidence: 99%

“…In the recent years, the different experimental works devoted to the transport measurements in KCK has further revive the field of Kondo paradigm. In particular, the experimental success of transport measurement in 1CK with two spin flavors [14,[20][21][22][23] has recently been extended to those with N -spin flavors [24][25][26][27][28][29] supplemented by various theoretical works [30][31][32][33][34][35][36][37]. Likewise, the celebrated experimental observation of spin 2CK physics [17] has eventually leads to the success of recent experimental observation of charge 2CK and 3CK effects [38,39].…”

Section: Introductionmentioning

confidence: 99%

Transmission phase evolution in fully screened and overscreened Kondo impurities

Karki

2021

Preprint

Self Cite

View full text Add to dashboard Cite

We study the coherent properties of fully screened and overscreened Kondo effects based on the Nozieres local Fermi-liquid theory and Affleck-Ludwig boundary conformal-field-theory approach, respectively. Coherent transports through an SU(N ) generalization of fully screened and the multi-K-channel overscreened Kondo impurities at and beyond the particle-hole (PH) symmetric point are thoroughly investigated. We report distinctive Fermi-liquid coefficients characterizing the finite temperature correction to the transmission phase shift and normalized visibility in fully screened Kondo regime, which can be measured with the existing experimental setups. Our work equally uncovers the significance of temperature correction to the transmission phase shift and visibility in non Fermi-liquid regime associated with the PH asymmetric overscreened Kondo effects with an arbitrary number of conduction channels K. We propose viable roots of verifying our predictions in connection to the recent experiments, in particular with the experiments studying highly symmetric forms of fully screened Kondo effects and two-channel overscreened Kondo effects realized in quantum dot nano-structures.

show abstract

“…This approximation may not only deviate from practical situations to some extent but also limit the advancement of manipulating multiple fields. Referring to thermoelectric(TE) effects [31][32][33], temperature-dependent transport processes have been investigated due to the electron-phonon coupling mechanism [34][35][36] or strong interaction in quantum-dot systems [37,38]. At the macroscopic level, the nonlinearity of material is often embodied in temperature-dependent thermal conductivities, electrical conductivities, and Seeback coefficients [39], which may introduce better TE performance beyond linear response to temperature or voltage bias [40].…”

mentioning

confidence: 99%

Theory for Thermoelectric Effect Control: Transformation Nonlinear Thermoelectricity

Huang

2022

Transformation Thermotics and Extended Theories

View full text Add to dashboard Cite

Temperature-dependent (nonlinear) transformation thermotics provides a powerful tool for designing multifunctional, switchable, or intelligent metamaterials in diffusion systems. However, its extension to multiphysics remains studied, in which the temperature dependence of intrinsic parameters is ubiquitous. Here, we theoretically establish a temperature-dependent transformation method for controlling multiphysics. Taking thermoelectric transport as a typical case, we prove the form invariance of its temperature-dependent governing equations and formulate the corresponding transformation rules. Our finite-element simulations demonstrate robust thermoelectric cloaking, concentrating, and rotating performance in temperature-dependent backgrounds. We further design two practical applications with temperature-dependent transformation: an ambient-responsive cloak-concentrator thermoelectric device that can switch between cloaking and concentrating; an improved thermoelectric cloak with nearly-thermostat performance inside. Our theoretical frameworks and application designs may provide guidance for efficiently controlling temperature-related multiphysics and enlighten subsequent intelligent multiphysical metamaterial research.

show abstract

Nonlinear Seebeck effect of SU(N) Kondo impurity

Cited by 13 publications

References 64 publications

Magnetic field dependence of the thermopower of Kondo-correlated quantum dots: Comparison with experiment

Magnetic field dependence of the thermopower of Kondo-correlated quantum dots: Comparison with experiment

Transmission phase evolution in fully screened and overscreened Kondo impurities

Theory for Thermoelectric Effect Control: Transformation Nonlinear Thermoelectricity

Contact Info

Product

Resources

About