Josephson supercurrent in a topological insulator without a bulk shunt

@article{Snelder2014JosephsonSI,
  title={Josephson supercurrent in a topological insulator without a bulk shunt},
  author={Marieke Snelder and Cor G. Molenaar and Y. Pan and D. Wu and Y. K. Huang and Anne de Visser and A A Golubov and Wilfred G. van der Wiel and Hans Hilgenkamp and Mark S. Golden and Alexander Brinkman},
  journal={Superconductor Science and Technology},
  year={2014},
  volume={27}
}
A Josephson supercurrent has been induced into the three-dimensional topological insulator Bi 1.5 ?> Sb 0.5 ?> Te 1.7 ?> Se 1.3 ?> . We show that the transport in Bi 1.5 ?> Sb 0.5 ?> Te 1.7 ?> Se 1.3 ?> exfoliated flakes is dominated by surface states and that the bulk conductivity can be neglected at the temperatures where we study the proximity induced superconductivity. We prepared Josephson junctions with widths in the order of 40 nm and lengths in the order of 50–80 nm on several Bi 1.5… 
View on IOP Publishing
arxiv.org
17 Citations

17 Citations

Signatures of induced superconductivity in AlOx-capped topological heterostructures
Conduction spectroscopy of a proximity induced superconducting topological insulator
The combination of superconductivity and the helical spin-momentum locking at the surface state of a topological insulator (TI) has been predicted to give rise to p-wave superconductivity and…
Anomalous Fraunhofer Patterns in Gated Josephson Junctions Based on the Bulk-Insulating Topological Insulator BiSbTeSe2.
TLDR
This work found that, by employing an advanced fitting procedure to use the maximum entropy method in a Monte Carlo algorithm, the anomalous Fraunhofer patterns are explained as a result of inhomogeneous supercurrent distributions on the TI surface in the junction.
Novel self-epitaxy for inducing superconductivity in the topological insulator (Bi1−xSbx)2Te3
Using the superconducting proximity effect for engineering a topological superconducting state in a topological insulator (TI) is a promising route to realize Majorana fermions. However, epitaxial…
Novel self-epitaxy for inducing superconductivity in a topological insulator with a record-high transparency
The seminal proposal by Fu and Kane to use the superconducting proximity effect for engineering a topological superconducting (TSC) state in a topological insulator (TI) has been extended to various…
Proximity‐Effect‐Induced Superconductivity in Nb/Sb2Te3‐Nanoribbon/Nb Junctions
Nanohybrid superconducting junctions using antimony telluride (Sb2Te3) topological insulator nanoribbons and Nb superconducting electrodes are fabricated using electron beam lithography and magnetron…
Revealing Surface States in In-Doped SnTe Nanoplates with Low Bulk Mobility.
TLDR
It is shown that nanostructures and reducing the bulk mobility are effective strategies to reveal the surface states and test for topological superconductors.
Tunneling spectroscopy and Josephson current of superconductor-ferromagnet hybrids on the surface of a 3D TI
We investigate the charge transport property of superconductor (S)/normal metal (N)/ ferromagnet insulator (FI)/(normal metal) N’ and S/N/FI/N’/S Josephson junctions on a three-dimensional…
Proximity-induced supercurrent through topological insulator based nanowires for quantum computation studies
TLDR
The dominant role of ballistic topological surface states in propagating the long-range proximity induced superconducting order with high IcRN product in long Bi2Se3 junctions is demonstrated and large upper critical magnetic fields exceeding the Chandrasekhar-Clogston limit suggests the existence of robust superconducted order with spin-triplet cooper pairing.
Proximity induced time-reversal topological superconductivity in Bi2Se3 films without phase tuning
Many proposals to generate a time-reversal invariant topological superconducting phase are based on imposing a $\pi$ phase difference between the superconducting leads proximitizing a nanostructure.…
...
...

References

SHOWING 1-10 OF 58 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.
Magnetotransport and induced superconductivity in Bi based three‐dimensional topological insulators
The surface of a three-dimensional (3D) topological insulator is conducting and the topologically nontrivial nature of the surface states is observed in experiments. It is the aim of this paper to…
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.
The Coexistence of Superconductivity and Topological Order in the Bi2Se3 Thin Films
TLDR
A thin layer of a topological insulator grown on the surface of a superconductor is shown to acquire a superconducting gap, laying the groundwork for experimentally realizing Majorana fermions in condensed matter physics.
Observations of two-dimensional quantum oscillations and ambipolar transport in the topological insulator Bi2Se3achieved by Cd doping
We present a defect-engineering strategy to optimize the transport properties of the topological insulator Bi2Se3 to show a high bulk resistivity and clear quantum oscillations. Starting with a…
Quantum Spin Hall Insulator State in HgTe Quantum Wells
TLDR
The quantum phase transition at the critical thickness, d = 6.3 nanometers, was independently determined from the magnetic field–induced insulator-to-metal transition, providing experimental evidence of the quantum spin Hall effect.
Observation of dirac holes and electrons in a topological insulator.
TLDR
It was found that in this material the transport properties sharply reflect the time dependence of the surface chemical potential, presenting a sign change in the Hall coefficient with time.
Topological Superconductivity in CuxBi2Se3
A topological superconductor (TSC) is characterized by the topologically-protected gapless surface state that is essentially an Andreev bound state consisting of Majorana fermions. While a TSC has…
Optimizing Bi 2-x Sb x Te 3-y Se y solid solutions to approach the intrinsic topological insulator regime
To optimize the bulk-insulating behavior in the topological insulator materials having the tetradymite structure, we have synthesized and characterized single-crystal samples of…
...
...