Charge Kondo Anomalies in PbTe Doped with Tl Impurities

Costi, T. A.; Zlatič, V.

doi:10.1103/physrevlett.108.036402

Cited by 35 publications

(42 citation statements)

References 26 publications

(76 reference statements)

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“…Narrow gap PbTe is known to have superior thermoelectric and optical properties and great potential for applications in energy and light sources [1][2][3][4]. As one of the few structure-mismatched heterostructures (as opposed to the more familiar 'lattice-mismatched' heterostructures due to the lattice parameter difference), CdTe/PbTe heterojunctions (HJs), which were first realized through epitaxial growth by Koike et al [5] have attracted much attention [6,7] since the synthesis of PbTe quantum dots (QDs) in a CdTe matrix that exhibits intensively enhanced room-temperature mid-infrared luminescence [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Twisted ZB–CdTe/RS–PbTe (111) heterojunction as a metastable interface structure

et al. 2012

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The heterostructures of (zinc-blende)-CdTe/(rock-salt)-PbTe are typically found to have their common cubic axes aligned to each other, as in the case of PbTe quantum dots embedded in a CdTe matrix. In this work, we perform both theoretical and experimental studies on the CdTe/PbTe heterostructure in a different geometry: a planar CdTe/PbTe (111) heterostructure. We simulate the epitaxial growth of CdTe (PbTe) on the (111) PbTe (CdTe) substrate, using a density-functional theory. A twisted CdTe/PbTe (111) interface structure has been predicted in the layer-by-layer epitaxial growth on the (111) substrate, in contrast to the non-twisted CdTe/PbTe (111) interface reported in the literature. This predicted structure has been confirmed experimentally in the heterostructure grown by molecular beam epitaxy, using a high-resolution transmission electron microscope. The twisted interface has a lower binding energy than the nontwisted one, indicating that the twisted structure is a metastable phase formed in 5

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Section: Introductionmentioning

confidence: 99%

Twisted ZB–CdTe/RS–PbTe (111) heterojunction as a metastable interface structure

et al. 2012

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“…In such a case the charge Kondo effect may occur, manifesting itself in the electronic [56], caloritronic [57] and spin-caloritronic [58] properties. Moreover, intensive theoretical and experimental investigations have clearly shown that in Tldoped PbTe the negative-U centers induce superconductivity in the otherwise normal host, while the charge Kondo effect takes place in the system [59][60][61][62][63]. The charge Kondo effect is, however, not present in our system.…”

Section: Introductionmentioning

confidence: 64%

Interplay of the Kondo effect with the induced pairing in electronic and caloric properties of T-shaped double quantum dots

Wójcik

Weymann

2018

Phys. Rev. B

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We examine the influence of the superconducting proximity effect on the transport properties of a T-shaped double quantum dot strongly coupled to two normal, nonmagnetic or ferromagnetic leads. We show that the two-stage Kondo screening may be suppressed or enhanced by the presence of pairing correlations, depending on the specific geometric arrangement of the device. We explain our results by invoking effective decrease of Coulomb interactions by proximity effect and find qualitatively correct description in many cases, although spin-filtering effect stemming from spindependent Fano-Kondo interference occurs to be surprisingly fragile to the presence of induced superconducting pairing correlations. The results are obtained within the numerical renormalization group framework in the limit of large superconducting gap, which allows for a reliable examination of the low-temperature sub-gap properties of the considered system. Nevertheless, finite temperature effects are also taken into account. arXiv:1804.08270v2 [cond-mat.mes-hall]

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“…Moreover, in PbTe system with non-magnetic Tl impurities, Kondo-like behavior appears in the resistivity, which is known as the charge Kondo effect [6,7]. The valence skipping phenomenon in d-electron systems has also been suggested [8,9], which stimulates further theoretical investigations on the valence skipping and related phenomena [10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 87%

Charge Kondo effect and superconductivity in the Falikov-Kimball model with pair hopping

2018

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We study the Falikov-Kimball model with the pair hopping between the conduction and localized bands to discuss how the charge Kondo effect is realized. By combining dynamical mean-field theory with the continuous time quantum Monte Carlo method, we clarify that the charge Kondo state survives even at zero temperature and this competes with the charge ordered and s-wave superconducting states. The role of the interorbital repulsion for the superconducting state is also addressed.

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Charge Kondo Anomalies in PbTe Doped with Tl Impurities

Cited by 35 publications

References 26 publications

Twisted ZB–CdTe/RS–PbTe (111) heterojunction as a metastable interface structure

Twisted ZB–CdTe/RS–PbTe (111) heterojunction as a metastable interface structure

Interplay of the Kondo effect with the induced pairing in electronic and caloric properties of T-shaped double quantum dots

Charge Kondo effect and superconductivity in the Falikov-Kimball model with pair hopping

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