Inverse proximity effect in 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>s</mml:mi></mml:math>
-wave and 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>d</mml:mi></mml:math>
-wave superconductors coupled to topological insulators

Hugdal, Henning G.; Amundsen, Morten; Linder, Jacob; Sudbø, Asle

doi:10.1103/physrevb.99.094505

Cited by 12 publications

(8 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Most previous studies have focused on the superconductivity induced in the TI layers. Less studied, however, is the feedback of TI layers on the HTSC layer [24]. In this section, we fix the chemical potential µ TI of Bi 2 Se 3 and vary the chemical potential µ SC of the HTSC layer, as well as the tunneling amplitudes t 1 = t 2 between the first TI layer and the HTSC layer, and show their effect on the superconducting order parameters.…”

Section: B Effects Of the Ti Layers On The Cupratementioning

confidence: 99%

See 1 more Smart Citation

Proximity effect in a heterostructure of a high- Tc superconductor with a topological insulator from dynamical mean field theory

Sénéchal

2020

Phys. Rev. B

View full text Add to dashboard Cite

We investigate the proximity effect in a heterostructure of the topological insulator (TI) Bi 2 Se 3 deposited on the HTSC material BSCCO. The latter is described by the one-band Hubbard model and is treated with cluster dynamical mean field theory (CDMFT), the TI layers being included via the CDMFT self-consistency loop. The penetration of superconductivity into the TI depends on the position of the Fermi level with respect to the TI gap. We illustrate the back action of the TI layer on the HTSC layer, in particular the gradual disappearance of Mott physics with increasing tunneling amplitude.

show abstract

Section: B Effects Of the Ti Layers On The Cupratementioning

confidence: 99%

“…The effect of correlations on the HTSC layer and of its hybridization with the TI layer have not been fully taken into account. Moreover, no attention has been paid to possible feedback of the TI layer onto the HTSC layer [24]. These are the topics we will address in this paper.…”

Section: Introductionmentioning

confidence: 99%

Proximity effect in a heterostructure of a high- Tc superconductor with a topological insulator from dynamical mean field theory

Sénéchal

2020

Phys. Rev. B

View full text Add to dashboard Cite

show abstract

“…With the Fermi momentum fixed, the chemical potential is determined by setting the Fermi energy to zero, E F ≡ E kF,+ = 0, yielding µ = F kF . The chemical potential should not be too high since the bulk bands will then influence the physics on the TI surface [40]. With the parameters used in this paper, µ is kept in the region 100 meV to 160 meV, ensuring that it is reasonable to ignore the bulk bands in the treatment of the TI surface [40].…”

Section: Self-energy and Renormalized Green's Functionmentioning

confidence: 99%

“…(37) and (38), suppressing any variations in the DOS, g, and photoexcitation matrix elements M for simplicity. The lattice constant is set to a = 7 Å, such that our choice of Fermi velocity corresponds to v F ≈ 4.56×10 5 m/s, which is within the range of reported values [6,8,21,40,56,57]. Each set of figures is then convolved with two different sets of assumed energy, E, and momentum, k, resolutions.…”

Section: Towards Experimental Measurementmentioning

confidence: 99%

Electron-magnon coupling and quasiparticle lifetimes on the surface of a topological insulator

Mæland,

Røst,

Wells

et al. 2021

Preprint

Self Cite

View full text Add to dashboard Cite

The fermionic self-energy on the surface of a topological insulator proximity coupled to ferroand antiferromagnetic insulators is studied. An enhanced electron-magnon coupling is achieved by allowing the electrons on the surface of the topological insulator to have a different exchange coupling to the two sublattices of the antiferromagnet. Such a system is therefore seen as superior to a ferromagnetic interface for the realization of magnon-mediated superconductivity. The increased electron-magnon-coupling simultaneously increases the self-energy effects. A careful study of this has been lacking, and in this paper we show how the inverse quasiparticle lifetime and energy renormalization on the surface of the topological insulator can be kept low close to the Fermi level by using a magnetic insulator with a sufficient easy-axis anisotropy. We find that the antiferromagnetic case is most interesting both from a theoretical and an experimental standpoint due to the increased electron-magnon coupling, combined with a reduced need for easy-axis anisotropy compared to the ferromagnetic case. We also consider a set of material and instrumental parameters where these selfenergies should be measurable in angle-resolved photoemission spectroscopy (ARPES) experiments, paving the way for a measurement of the interfacial exchange coupling strength.

show abstract

“…On the theoretical side, several 3DTI/superconductor coupled systems have been studied [1,[20][21][22][23][24][25][26]. Generally, there are two theoretical methods to study the proximity effect in a heterostructure system.…”

Section: Introductionmentioning

confidence: 99%

Proximity effect and inverse proximity effect in a topological-insulator/iron-based-superconductor heterostructure

Zhu,

Zhou

2023

Preprint

View full text Add to dashboard Cite

We theoretically study the proximity effect and the inverse proximity effect in a topological insulator/iron-based superconductor heterostructure based on the microscopic model. The superconducting order parameter is self-consistently calculated. Its magnitude decreases when the coupling of these two systems increases. The induced pairing order parameter exhibits negative and positive values, while the negative pairing near the Γ = (0, 0) point is dominant. This parameter has twofold symmetry and includes an s-wave component and a d-wave component. The magnitude of the induced pairing order parameter has a maximal value at the coupling strength tp = 0.3 ≈ 0.06 eV. The spectral function and the local density of states are calculated and may be used to probe the proximity effect. We also discuss the feedback of the topological insulator to the iron-based superconductor layer. The normal-state Fermi surface is distorted by the coupling, and additional Fermi pockets are induced. An effective spin-orbit interaction term is induced. In the superconducting state, the previous fourfold symmetry of the order parameter is broken, and a d-wave component pairing term is also induced. Our main results can be well understood by analyzing the Fermi surfaces of the original systems.

show abstract

Inverse proximity effect in s -wave and d -wave superconductors coupled to topological insulators

Cited by 12 publications

References 49 publications

Proximity effect in a heterostructure of a high- Tc superconductor with a topological insulator from dynamical mean field theory

Proximity effect in a heterostructure of a high- Tc superconductor with a topological insulator from dynamical mean field theory

Electron-magnon coupling and quasiparticle lifetimes on the surface of a topological insulator

Proximity effect and inverse proximity effect in a topological-insulator/iron-based-superconductor heterostructure

Contact Info

Product

Resources

About