Massive Suppression of Proximity Pairing in Topological 
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Hlevyack, Joseph A.; Najafzadeh, Sahand; Lin, Meng-Kai; Hashimoto, Takahiro; Nagashima, Tsubaki; Tsuzuki, A.; Fukushima, Akiko; Bareille, C.; Bai, Yang; Chen, Peng; Liu, Ro-Ya; Li, Yao; Flötotto, David; Ávila, J.; Eckstein, J. N.; Shin, Shik; Okazaki, Kozo; Chiang, T.‐C.

doi:10.1103/physrevlett.124.236402

Cited by 10 publications

(14 citation statements)

References 37 publications

(28 reference statements)

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“…More recently, the fabrication of bulk-insulating (BixSb1-x)2Te3/Nb heterostructures (x = 0.62) by flip-chip technique (10) resulted in the absence of proximity induced superconductivity even for (BixSb1-x)2Te3 films only 2 layers thick (10). These results, compared to heavily doped Bi2Se3 films grown on the same substrate, suggested that the bulk states play a crucial role in transiting superconductivity to the topological Dirac states (10).…”

Section: Introductionmentioning

confidence: 99%

Competing Energy Scales in Topological Superconducting Heterostructures

et al. 2021

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Artificially engineered topological superconductivity has emerged as a viable route to create Majorana modes, exotic quasiparticles which have raised great expectations for storing and manipulating information in topological quantum computational schemes. The essential ingredients for their realization are spin non-degenerate metallic states proximitized to an s-wave superconductor. In this context, proximity-induced superconductivity in materials with a sizable spin-orbit coupling has been heavily investigated in recent years. Although there is convincing evidence that superconductivity may indeed be induced, it has been difficult to elucidate its topological nature. In this work, we systematically engineer an artificial topological superconductor by progressively introducing superconductivity (Nb) into metals with strong spinorbital coupling (Pt) and 3D topological surface states (Bi2Te3). Through a longitudinal study of the character of superconducting vortices within s-wave superconducting Nb and proximitycoupled Nb/Pt and Nb/Bi2Te3, we detect the emergence of a zero-bias peak that is directly linked to the presence of topological surface states. Supported by a detailed theoretical model, our results are rationalized in terms of competing energy trends which are found to impose an upper limit to the size of the minigap separating Majorana and trivial modes, its size being ultimately linked to fundamental materials properties.

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Section: Introductionmentioning

confidence: 99%

Competing Energy Scales in Topological Superconducting Heterostructures

et al. 2021

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“…In this paper, we report the observation of Ising superconductivity in few-layer NbSe 2 (∼15 nm) with an overlayer of SL-MoS 2 . Having both materials from the TMD family avoids many of the problems arising from lattice mismatch at the interface [14][15][16][17]. Through systematic magnetotransport measurements, we establish that the system develops an Ising superconductivity that is distinct from that of pristine NbSe 2 .…”

Section: Introductionmentioning

confidence: 89%

Transition from three- to two-dimensional Ising superconductivity in few-layer NbSe2 by proximity effect from van der Waals heterostacking

et al. 2021

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We report the experimental observation of Ising superconductivity in three-dimensional NbSe 2 stacked with single-layer MoS 2 . The angular dependence of the upper critical magnetic field and the temperature dependence of the upper parallel critical field confirm the appearance of two-dimensional Ising superconductivity in threedimensional NbSe 2 with a single-layer MoS 2 overlay. We show that the superconducting phase has strong Ising spin-orbit correlations which make the holes spin nondegenerate. Our observation of Ising superconductivity in heterostructures of few-layer NbSe 2 of thickness ∼15 nm with single-layer MoS 2 raises the interesting prospect of observing topological chiral superconductors with nontrivial Chern numbers in a momentum-space spin-split fermionic system.

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“…In this letter, we report the observation of Ising superconductivity in few-layer NbSe 2 (∼ 15 nm) with an overlayer of single-layer MoS 2 . Having both materials from the TMD family avoids many of the problems arising from lattice mismatch at the interface [14][15][16][17]. Through systematic magnetotransport measurements, we establish that system develops an Ising superconductivity that is distinct from that of pristine NbSe 2 .…”

Section: Introductionmentioning

confidence: 89%

Transition from three- to two-dimensional Ising superconductivity in few-layer NbSe2 by proximity effect from van der Waals heterostacking

Baidya,

Sahani,

Kundu

et al. 2021

Preprint

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We report the experimental observation of Ising superconductivity in 3-dimensional NbSe 2 stacked with single-layer MoS 2 . The angular dependence of the upper critical magnetic field and the temperature dependence of the upper parallel critical field confirm the appearance of twodimensional Ising superconductivity in the 3-dimensional NbSe 2 with single-layer MoS 2 overlay.We show that the superconducting phase has strong Ising spin-orbit correlations which make the holes spin non-degenerate. Our observation of Ising superconductivity in heterostructures of fewlayer NbSe 2 of thickness ∼ 15 nm with single-layer MoS 2 raises the interesting prospect of observing topological chiral superconductors with nontrivial Chern numbers in a momentum-space spin-split fermionic system.

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Massive Suppression of Proximity Pairing in Topological (Bi1−xSbx)

Cited by 10 publications

References 37 publications

Competing Energy Scales in Topological Superconducting Heterostructures

Competing Energy Scales in Topological Superconducting Heterostructures

Transition from three- to two-dimensional Ising superconductivity in few-layer NbSe2 by proximity effect from van der Waals heterostacking

Transition from three- to two-dimensional Ising superconductivity in few-layer NbSe2 by proximity effect from van der Waals heterostacking

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