Direct evidence for interfacial superconductivity in two-layer semiconducting heterostructures

Fogel, N. Ya.; Buchstab, E. I.; Bomze, Yuriy; Yuzephovich, O. I.; Mikhaı̆lov, M. Yu.; Sipatov, A. Yu.; Пашицкий, Э. А.; Shekhter, R. I.; Jonson, M.

doi:10.1103/physrevb.73.161306

Cited by 31 publications

(28 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In one early study of dislon theory [76], we have shown that the T c is determined by this competition effect: when the quantum effect is dominant, then T c is increased, and vice versa. The computed T c shows good agreement with a number of existing experimental data; particularly, it may provide a feasible explanation of the mysterious dislocation-induced superconductivity [75,119].…”

Section: Discussionsupporting

confidence: 77%

Theory of electron–phonon–dislon interacting system—toward a quantized theory of dislocations

Tsurimaki

Meng

et al. 2018

New J. Phys.

View full text Add to dashboard Cite

We provide a comprehensive theoretical framework to study how crystal dislocations influence the functional properties of materials, based on the idea of a quantized dislocation, namely a 'dislon'. In contrast to previous work on dislons which focused on exotic phenomenology, here we focus on their theoretical structure and computational power. We first provide a pedagogical introduction that explains the necessity and benefits of taking the dislon approach and why the dislon Hamiltonian takes its current form. Then, we study the electron-dislocation and phonon-dislocation scattering problems using the dislon formalism. Both the effective electron and phonon theories are derived, from which the role of dislocations on electronic and phononic transport properties is computed. Compared with traditional dislocation scattering studies, which are intrinsically single-particle, loworder perturbation and classical quenched defect in nature, the dislon theory not only allows easy incorporation of quantum many-body effects such as electron correlation, electron-phonon interaction, and higher-order scattering events, but also allows proper consideration of the dislocation's long-range strain field and dynamic aspects on equal footing for arbitrary types of straight-line dislocations. This means that instead of developing individual models for specific dislocation scattering problems, the dislon theory allows for the calculation of electronic structure and electrical transport, thermal transport, optical and superconducting properties, etc, under one unified theory. Furthermore, the dislon theory has another advantage over empirical models in that it requires no fitting parameters. The dislon theory could serve as a major computational tool to understand the role of dislocations on multiple materials' functional properties at an unprecedented level of clarity, and may have wide applications in dislocated energy materials. List of symbols in alphabetical orderA s Classical electron-dislon scattering amplitude A(k 1 , k 2 , k 3 ) Anharmonic coupling constant b k Phonon annihilation operator + b k Phonon creation operator b, b Phonon fields in coherent state form b Burgers vector c ijkl Stiffness tensor OPEN ACCESS RECEIVED R j 0 Atomic coordinate of j th atom in a perfect crystal S Action S Energy flow operator T Dislocation kinetic energy Recently, some of us started to develop a theory based on the quantization of a dislocation and introduced the 'dislon' as the basic quanta of a quantized dislocation for arbitrary types of dislocation lines, including both edge and screw dislocations. Starting from a one-dimensional quantization approach [25, 36, 77], we treated electron [25] and phonon [36] scattering with an individual dislocation, and single electron-interacting dislocation pair scattering [77]. Later, we generalized the one-dimensional approach to a full three-dimensional quantization [76], but focused on the electron-dislocation superconductivity.In this study, we generalize the dislon theory in 3D to include electron...

show abstract

Section: Discussionsupporting

confidence: 77%

Theory of electron–phonon–dislon interacting system—toward a quantized theory of dislocations

Tsurimaki

Meng

et al. 2018

New J. Phys.

View full text Add to dashboard Cite

show abstract

“…Interface superconductivity between chalcogenides such as PbTe/PbSe and PbSe/PbS has also been reported 8 .…”

mentioning

confidence: 95%

Two-dimensional superconductivity at the interface of a Bi2Te3/FeTe heterostructure

et al. 2014

View full text Add to dashboard Cite

The realization of superconductivity at the interface between a topological insulator and an iron-chalcogenide compound is highly attractive for exploring several recent theoretical predictions involving these two new classes of materials. Here we report transport measurements on a Bi 2 Te 3 /FeTe heterostructure fabricated via van der Waals epitaxy, which demonstrate superconductivity at the interface, which is induced by the Bi 2 Te 3 epilayer with thickness even down to one quintuple layer, though there is no clear-cut evidence that the observed superconductivity is induced by the topological surface states. The two-dimensional nature of the observed superconductivity with the highest transition temperature around 12 K was verified by the existence of a Berezinsky-Kosterlitz-Thouless transition and the diverging ratio of in-plane to out-plane upper critical field on approaching the superconducting transition temperature. With the combination of interface superconductivity and Dirac surface states of Bi 2 Te 3 , the heterostructure studied in this work provides a novel platform for realizing Majorana fermions.

show abstract

“…The technique for the magnetotransport measurements is described in more detail elsewhere. [4][5][6] Experimental data and interpretation…”

Section: Techniques For Fabricating the Samples And For Making The Trmentioning

confidence: 99%

“…The period of this superconducting interface nanonetwork is 5.2 nm for PbTe/PbS nanostructures. [3][4][5][6] During a comprehensive experimental investigation it was found that two-layer PbTe/PbS heterostructures can be divided nominally into 3 categories (although there is no sharp boundary between these categories). 6 The first category includes samples with semiconducting layer thicknesses d !…”

Section: Techniques For Fabricating the Samples And For Making The Trmentioning

confidence: 99%

Suppression of superconductivity by strong magnetic fields in PbTe/PbS heterostructures with a superconducting interface

Bengus

Sipatov

Yuzephovich

2013

Low Temperature Physics

Self Cite

View full text Add to dashboard Cite

This is a comprehensive study of the effect of strong magnetic fields on superconductivity in PbTe/PbS heterostructures with semiconducting layers of different thicknesses. Metallic conductivity and superconductivity (critical temperature T c 6.5 K) in PbTe/PbS heterostructures are caused by inversion of bands along a continuous network of misfit dislocations that develops at the interfaces between semiconductor layers of sufficient thickness (d > 80 nm). With decreasing d the continuity of the superconducting interface is disrupted, T c decreases, and the metallic conductivity changes to a semiconducting type. Disruption of the continuity of the superconducting interface is found to be a necessary condition for observing a magnetic-field induced superconductor-insulator transition (SIT) and has a significant influence on its features: a fan-like set of resistance curves R(T); intersection of the R(B) curves for fields perpendicular, as well as parallel, to the interface; and, negative magnetoresistance. A scaling analysis based on Fisher's theoretical model is carried out for these samples. No evidence of a SIT was observed in heterostructures with a perfect interface. It appears that the SIT effect is related to percolation phenomena characteristic of granular superconductors. V C 2013 AIP Publishing LLC.

show abstract

Direct evidence for interfacial superconductivity in two-layer semiconducting heterostructures

Cited by 31 publications

References 10 publications

Theory of electron–phonon–dislon interacting system—toward a quantized theory of dislocations

Theory of electron–phonon–dislon interacting system—toward a quantized theory of dislocations

Two-dimensional superconductivity at the interface of a Bi2Te3/FeTe heterostructure

Suppression of superconductivity by strong magnetic fields in PbTe/PbS heterostructures with a superconducting interface

Contact Info

Product

Resources

About