Proximity-Induced Superconductivity in CdTe–HgTe Core–Shell Nanowires

Hajer, J.; Kessel, Maximilian; Brüne, C.; Stehno, Martin; Buhmann, H.; Molenkamp, Laurens W.

doi:10.1021/acs.nanolett.9b01472

Cited by 16 publications

(14 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…There have been a number of studies on the proximity-induced topological superconductivity based on the topological feature from HgTe. − However, the intrinsic bulk superconductivity of HgTe-based compounds is still absent. Our findings reveal that superconductivity in Hg 0.781 Cd 0.219 Te can be achieved by the pressure-induced phonon softening accompanied by the phase transformation.…”

Section: Resultsmentioning

confidence: 99%

“…There is still lack of the comprehensive understanding of the evolution of chemical bonds and electrical transport behaviors with pressure in the view of experiment. Moreover, the strained HgTe films have been widely used to investigate the proximity effect where a topological insulator comes in contact with a superconductor. − However, to our knowledge, the superconductivity or even topological superconductivity of the bulk MCT compounds at high pressures has not been explored up to now.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Discovery of Superconductivity in Mercury Cadmium Telluride

et al. 2021

View full text Add to dashboard Cite

Mercury cadmium telluride compounds exhibit large tunability of nontrivial electronic states by modifying chemical composition, temperature, or pressure. Despite the growing interest in Hg 1−x Cd x Te, very little information currently exists on how their electrical properties are affected upon compression. Here, we systematically investigate the high-pressure behaviors of bulk Au-doped Hg 0.781 Cd 0.219 Te crystals with the doping level close to the Kane fermion point. A clear structure evolution path of this compound with pressure varying from zinc blende (F43̅ m) through cinnabar (P3 1 21) and rocksalt (Fm3̅ m) to the orthorhombic one (Cmcm) is established from the measurements of phonon spectra, resistivity, and the Hall effect. Pressureinduced phonon softening is proposed to be the driving force for the phase transition. The last two phases are found to exhibit superconductivity with different pressure dependence of the critical temperature. These results and findings suggest that superconductivity is the general nature of mercury cadmium tellurium compounds at high pressures. The group II−VI compounds thus also offer a pool for finding new superconductors.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Discovery of Superconductivity in Mercury Cadmium Telluride

et al. 2021

View full text Add to dashboard Cite

show abstract

“…While our discussion is general and applies to all the quantum spin Hall (candidate) systems, we argue that our results are readily observable in HgTe-CdTe heterostructures. Indeed, with the realistic length scales L 3 μm, 1 μm, W 200 nm and w 30 nm, the magnetic field necessary to observe the effect is of the order B 10 −3 T. The temperature range is limited by the pairing potential Δ ∼ 0.40 meV (a reasonable value for HgTe-based systems [76,77]), which determines an upper bound of ∼300 mK. Similarly, the bias should not exceed ∼80 μeV.…”

Section: Discussionmentioning

confidence: 99%

Anomalous flux periodicity in proximitised quantum spin Hall constrictions

et al. 2022

View full text Add to dashboard Cite

We theoretically analyse a long constriction between the helical edge states of a two-dimensional topological insulator. The constriction is laterally tunnel-coupled to two superconductors and a magnetic field is applied perpendicularly to the plane of the two-dimensional topological insulator. The Josephson current is calculated analytically up to second order in the tunnel coupling both in the absence and in the presence of a bias (DC and AC Josephson currents). We show that in both cases the current acquires an anomalous $4\pi$-periodicity with respect to the magnetic flux that is absent if the two edges are not tunnel-coupled to each other. The result, that provides at the same time a characterisation of the device and a possible experimental signature of the coupling between the edges, is stable against temperature. The processes responsible for the anomalous $4\pi$-periodicity are the ones where, within the constriction, one of the two electrons forming a Cooper pair tunnels between the two edges.

show abstract

“…The study of the proximity effect between a superconductor and a semiconductor or an unconventional metal, has lately received a dramatic boost due to the increasing possibilities to manufacture a larger variety of interfaces and materials. Novel phenomenology of the proximity effect is currently coming from the integration of semiconducting nanowires, with strong spin orbit coupling, as barriers, as well as the edge and surface states of twodimensional (2D) and three-dimensional (3D) Topological Insulators (TIs) [1][2][3][4][5] , and Dirac semimetals 6,7 . In these cases, the Josephson transport properties of the hybrid devices would manifest neat fingerprints related to the formation of Majorana bound states, of great interest for topological quantum computation [8][9][10] .…”

Section: Introductionmentioning

confidence: 99%

Topological insulator nanoribbon Josephson junctions: Evidence for size effects in transport properties

Kunakova

Surendran

Montemurro

et al. 2020

Journal of Applied Physics

View full text Add to dashboard Cite

We have used Bi 2 Se 3 nanoribbons, grown by catalyst-free Physical Vapor Deposition to fabricate high quality Josephson junctions with Al superconducting electrodes. In our devices we observe a pronounced reduction of the Josephson critical current density J c by reducing the width of the junction, which in our case corresponds to the width of the nanoribbon. Because the topological surface states extend over the entire circumference of the nanoribbon, the superconducting transport associated to them is carried by modes on both the top and bottom surfaces of the nanoribbon. We show that the J c reduction as a function of the nanoribbons width can be accounted for by assuming that only the modes travelling on the top surface contribute to the Josephson transport as we derive by geometrical consideration. This finding is of a great relevance for topological quantum circuitry schemes, since it indicates that the Josephson current is mainly carried by the topological surface states.

show abstract

Proximity-Induced Superconductivity in CdTe–HgTe Core–Shell Nanowires

Cited by 16 publications

References 38 publications

Discovery of Superconductivity in Mercury Cadmium Telluride

Discovery of Superconductivity in Mercury Cadmium Telluride

Anomalous flux periodicity in proximitised quantum spin Hall constrictions

Topological insulator nanoribbon Josephson junctions: Evidence for size effects in transport properties

Contact Info

Product

Resources

About