Origin of bias-independent conductance plateaus and zero-bias conductance peaks in 
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 hybrid structures

Li, Hui; Zhou, Benjamin T.; He, Jun; Wang, Huanwen; Zhang, Huachen; Liu, Hong‐Chao; Yi, Ya Sha; Wu, Changming; Law, K. T.; He, Hongtao; Wang, Jiannong

doi:10.1103/physrevb.96.075107

Cited by 18 publications

(12 citation statements)

References 59 publications

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“…We further contrast our result with previous reports on superconductivity in surface states of a usual 3D topological insulator (TI). Topologically nontrivial surface states also exist in TI and similar BICP due to surface states has been reported in Bi 2 Se 3 /NbSe 2 hybrid structure 46 . The contribution of surface states and bulk states in TI systems is usually separated by tuning the Fermi level within the bulk gap using electric gating or chemical doping.…”

Section: Discussionsupporting

confidence: 75%

Proximity-induced surface superconductivity in Dirac semimetal Cd3As2

et al. 2019

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Cd 3 As 2 is a three-dimensional Dirac semimetal with separated Dirac points in momentum space. In spite of extensive transport and spectroscopic studies on its exotic properties, the evidence of superconductivity in its surface states remains elusive. Here, we report the observation of proximity-induced surface superconductivity in Nb/Cd 3 As 2 hybrid structures. Our four-terminal transport measurement identifies a pronounced proximity-induced pairing gap (gap size comparable to Nb) on the surfaces, which exhibits a flat conductance plateau in differential conductance spectra, consistent with our theoretical simulations. The surface supercurrent from Nb/Cd 3 As 2 /Nb junctions is also achieved with a Fraunhofer/SQUID-like pattern under out-of-plane/in-plane magnetic fields, respectively. The resultant mapping shows a predominant distribution on the top and bottom surfaces as the bulk carriers are depleted, which can be regarded as a higher dimensional analog of edge supercurrent in two-dimensional quantum spin Hall insulators. Our study provides the evidence of surface superconductivity in Dirac semimetals.

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Section: Discussionsupporting

confidence: 75%

Proximity-induced surface superconductivity in Dirac semimetal Cd3As2

et al. 2019

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“…However, the observed spectra resembled a V-shape. Similar V-shape dips have been reported in other TI/superconductor (TI/S) junctions [39,40], while the zero-bias conductance peaks have been also detected in TI/S junctions [17,37,41]. As mentioned in the introduction, TI/S junctions are expected to behave as a p-wave superconductor, and both the dip and the peak in the spectra possibly reflect this p-wave nature.…”

Section: Junction Fabrication and Transport Propertiessupporting

confidence: 79%

“…These induced superconductive states are expected to have p-wave symmetry as a gap function ∆ [2,11]. In three-dimensional (3D) TI-based junctions, although the origins of zero-bias conduction peaks are still controversial due to the existing bulk carriers [17], such signals are considered to also represent the p-wave superconductivity states [18,19]. Furthermore, the 3D TI-based junctions potentially induce further unconventional superconductivity states, which provide another possible way to access Majorana fermions; the proximity-induced superconductive states depend on the strength and direction of the applied magnetic fields and moments [20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Proximity-Induced Superconducting States of Magnetically Doped 3D Topological Insulators with High Bulk Insulation

et al. 2019

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We studied magnetized topological insulator/superconductor junctions with the expectation of unconventional superconductive states holding Majorana fermions induced by superconductive proximity effects on the surface states of magnetized topological insulators (TIs), attached by conventional superconductors. We introduced Fe-doped BiSbTe2Se as an ideal magnetic TI and used the developed junction fabrication process to access the proximity-induced surface superconducting states. The bulk single crystals of the Fe-doped TI showed excellent bulk-insulating properties and ferromagnetism simultaneously at a low temperature. Meanwhile, the fabricated junctions also showed an insulating behavior above 100 K, as well as metallic conduction at a low temperature, which reflects bulk carrier freezing. In addition, we observed a proximity-induced gap structure in the conductance spectra. These results indicate that the junctions using the established materials and process are preferable to observe unconventional superconducting states which are induced via the surface channels of the magnetized TI. We believe that the developed process can be applied for the fabrication of complicated junctions and suites for braiding operations.

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“…12 For instance, by coupling with topological insulators, it is possible to probe quantized anomalous Hall effect and magnetic monopoles. 31,32 With superconductors, Andreev reflection effect 7,33 and the super-exchange interaction 34,35 can be investigated through the proximity effect. Besides the exotic physics, the molecular beam epitaxy (MBE) is well established in growing highly uniform and crystalline quality films.…”

Section: Introductionmentioning

confidence: 99%

Wafer-scale two-dimensional ferromagnetic Fe3GeTe2 thin films grown by molecular beam epitaxy

et al. 2017

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Recently, layered two-dimensional ferromagnetic materials (2D FMs) have attracted a great deal of interest for developing lowdimensional magnetic and spintronic devices. Mechanically exfoliated 2D FMs were discovered to possess ferromagnetism down to monolayer. It is therefore of great importance to investigate the distinct magnetic properties at low dimensionality. Here, we report the wafer-scale growth of 2D ferromagnetic thin films of Fe 3 GeTe 2 via molecular beam epitaxy, and their exotic magnetic properties can be manipulated via the Fe composition and the interface coupling with antiferromagnetic MnTe. A 2D layer-by-layer growth mode has been achieved by in situ reflection high-energy electron diffraction oscillations, yielding a well-defined interlayer distance of 0.82 nm along {002} surface. The magnetic easy axis is oriented along c-axis with a Curie temperature of 216.4 K. Remarkably, the Curie temperature can be enhanced when raising the Fe composition. Upon coupling with MnTe, the coercive field dramatically increases 50% from 0.65 to 0.94 Tesla. The large-scale layer-by-layer growth and controllable magnetic properties make Fe 3 GeTe 2 a promising candidate for spintronic applications. It also opens up unprecedented opportunities to explore rich physics when coupled with other 2D superconductors and topological matters.

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Origin of bias-independent conductance plateaus and zero-bias conductance peaks in Bi2Se3/NbSe2 hybrid structures

Cited by 18 publications

References 59 publications

Proximity-induced surface superconductivity in Dirac semimetal Cd3As2

Proximity-induced surface superconductivity in Dirac semimetal Cd3As2

Proximity-Induced Superconducting States of Magnetically Doped 3D Topological Insulators with High Bulk Insulation

Wafer-scale two-dimensional ferromagnetic Fe3GeTe2 thin films grown by molecular beam epitaxy

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