Signature of a topological phase transition in the Josephson supercurrent through a topological insulator

@article{Orlyanchik2016SignatureOA,
  title={Signature of a topological phase transition in the Josephson supercurrent through a topological insulator},
  author={Vladimir Orlyanchik and Martin P Stehno and Christopher D. Nugroho and Pouyan Ghaemi and Matthew Brahlek and Nikesh Koirala and Seongshik Oh and Dale J. van Harlingen},
  journal={Physical Review B},
  year={2016},
  volume={93},
  pages={035307}
}
Topological insulators (TIs) hold great promise for topological quantum computation in solid-state systems. Recently, several groups reported experimental data suggesting that signatures of Majorana modes have been observed in topological insulator Josephson junctions (TIJJs). A prerequisite for the exploration of Majorana physics is to obtain a good understanding of the properties of low-energy Andreev bound states (ABSs) in a material with a topologically nontrivial band structure. Here, we… 

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References

SHOWING 1-10 OF 53 REFERENCES
Josephson supercurrent through a topological insulator surface state.
TLDR
Direct evidence for Josephson supercurrents in superconductor (Nb)-topological insulator (Bi(2)Te(3))-superconductor electron-beam fabricated junctions is provided by the observation of clear Shapiro steps under microwave irradiation, and a Fraunhofer-type dependence of the critical current on magnetic field.
Symmetry protected Josephson supercurrents in three-dimensional topological insulators.
TLDR
It is shown that the supercurrent is largely carried by surface states, due to the inherent topology of the bands, and that it is robust against disorder, which clarifies key open issues regarding the nature of supercurrents in topological insulators.
Stabilization of Majorana modes in magnetic vortices in the superconducting phase of topological insulators using topologically trivial bands.
TLDR
It is shown that, due to the hybridization with the trivial band, Majorana modes are preserved over a large, extended doping range for p doping, and opens a route to study other topological features of doped compounds that cannot be modeled using the simple Bi(2)Se(3) Dirac model.
Dynamical gate-tunable supercurrents in topological Josephson junctions
Josephson junctions made of closely-spaced conventional superconductors on the surface of 3D topological insulators have been proposed to host Andreev bound states (ABSs) which can include Majorana
Andreev bound states and current-phase relations in three-dimensional topological insulators
To guide the search for the Majorana fermion, we theoretically study superconductor/topological-insulator/superconductor (S/TI/S) junctions in an experimentally relevant regime. We find that the
Influence of topological edge states on the properties of Al/Bi2Se3/Al hybrid Josephson devices
In superconductor-topological insulator-superconductor hybrid junctions, the barrier edge states are expected to be protected against backscattering, to generate unconventional proximity effects,
Coexistence of the topological state and a two-dimensional electron gas on the surface of Bi(2)Se(3).
TLDR
It is shown that the single Dirac cone comprising the topological state of the prototypical topological insulator Bi(2)Se(3) can co-exist with a two-dimensional electron gas (2DEG), a cornerstone of conventional electronics.
Vortex lattices in the superconducting phases of doped topological insulators and heterostructures
Majorana fermions are predicted to play a crucial role in condensed matter realizations of topological quantum computation. These heretofore undiscovered quasiparticles have been predicted to exist
Gate-tuned normal and superconducting transport at the surface of a topological insulator
TLDR
This work studies transport through superconducting junctions fabricated on thin Bi2Se3 single crystals, equipped with a gate electrode, to demonstrate how gated nano-electronic devices give control over normal andsuperconducting transport of Dirac fermions at an individual surface of a three-dimensional topological insulators.
Transport properties of topological insulators: Band bending, bulk metal-to-insulator transition, and weak anti-localization
Abstract We reanalyze some of the critical transport experiments and provide a coherent understanding of the current generation of topological insulators (TIs). Currently TI transport studies abound
...
1
2
3
4
5
...