Flux-induced topological superconductor in planar Josephson junction

Liu, Jie; Wu, Yijia; Sun, Qing-Feng; Xie, Xiaoming

doi:10.1103/physrevb.100.235131

Cited by 11 publications

(6 citation statements)

References 54 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A push to seek alternative platforms for topological superconductivity led to the demonstration of robust proximityinduced superconductivity in a two-dimensional electron gas (2DEG) [18][19][20] which offers important opportunities to realize and control MBS [21][22][23][24][25][26][27]. Recent experiments in planar Josephson junctions (JJs) [28][29][30] reveal that topological superconductivity exists over a large parameter space without requiring fine tuning, while demonstrating the key role of superconducting phase to control the topological transition.…”

mentioning

confidence: 99%

Phase Control of Majorana Bound States in a Topological X Junction

et al. 2020

View full text Add to dashboard Cite

Topological superconductivity supports exotic Majorana bound states (MBS) which are chargeless zeroenergy emergent quasiparticles. With their non-Abelian exchange statistics and fractionalization of a single electron stored nonlocally as a spatially separated MBS, they are particularly suitable for implementing fault-tolerant topological quantum computing. While the main efforts to realize MBS have focused on one-dimensional systems, the onset of topological superconductivity requires delicate parameter tuning and geometric constraints pose significant challenges for their control and demonstration of non-Abelian statistics. To overcome these challenges, building on recent experimental advances in planar Josephson junctions (JJs), we propose a MBS platform of X-shaped JJs. This versatile implementation reveals how external flux control of the superconducting phase difference can generate and manipulate multiple MBS pairs to probe non-Abelian statistics. The underlying topological superconductivity exists over a large parameter space, consistent with materials used in our fabrication of such X junctions, as an important step towards scalable topological quantum computing. arXiv:1909.05386v1 [cond-mat.mes-hall]

show abstract

mentioning

confidence: 99%

Phase Control of Majorana Bound States in a Topological X Junction

et al. 2020

View full text Add to dashboard Cite

show abstract

“…The effective mass of electron m * = 0.026 m e , here m e is the bare electronic mass. Different topological phases can be achieved by tuning the chemical potential μ [40]. A pair of MBSs can appear in our system at μ = 0.27 meV.…”

Section: Numerical Results and Discussionmentioning

confidence: 96%

Bending effect on the Majorana bound states in planar Josephson junctions

Hassan¹,

Wu²,

Xu³

et al. 2021

J. Phys.: Condens. Matter

View full text Add to dashboard Cite

We consider the bending effect on the formation of Majorana bound states (MBSs) in planar Josephson junctions where the normal stripe is tilted in a V shape. Our results show that the MBSs remain robust for moderate bending angles. Beyond some critical angles, the degradation of MBSs can be revealed by its eigenspectrum as well as the Majorana polarization (MP). Our results show that the parameter space of bending angle for robust MBSs can be significantly enlarged by tuning the superconducting phase difference across the Josephson junction. These findings suggest that the interplay of the junction geometry and the device parameters provides richer degree of freedom in designing topological superconducting devices for future applications. The MP analysis is an indispensable tool for characterizing the Majorana states.

show abstract

“…To overcome these limitations, 2D proximitized materials are sought [21][22][23][24][25][26][27][28][29][30][31][32][33]. Here we reveal how mini-gate control in planar Josephson junctions (JJs), based on common normal (N) and superconducting (S) regions, provides a versatile platform to realize multiple MBS and implement their fusion.…”

Section: Introductionmentioning

confidence: 99%

Fusion of Majorana Bound States with Mini-Gate Control in Two-Dimensional Systems

Zhou,

Dartiailh,

Sardashti

et al. 2021

Preprint

View full text Add to dashboard Cite

A hallmark of topological superconductivity is the non-Abelian statistics of Majorana bound states (MBS), its chargeless zero-energy emergent quasiparticles. The resulting fractionalization of a single electron, stored nonlocally as a two spatially separated MBS, provides a powerful platform for implementing fault-tolerant topological quantum computing. However, despite intensive efforts, experimental support for MBS remains indirect and does not probe their non-Abelian statistics. Here we propose how to overcome this obstacle in minigate controlled planar Josephson junctions (JJ) and demonstrate non-Abelian statistics through MBS fusion, detected by charge sensing using a quantum point contact. The feasibility of preparing, manipulating, and fusing MBS in two-dimensional (2D) systems is supported in our experiments which demonstrate the control of superconducting properties with five mini gates in InAs/Al-based JJs. While we focus on this well-established platform, where the topological superconductivity was already experimentally detected, our proposal to identify elusive non-Abelian statistics motivates also further MBS studies in other gate-controlled 2D systems.

show abstract

Flux-induced topological superconductor in planar Josephson junction

Cited by 11 publications

References 54 publications

Phase Control of Majorana Bound States in a Topological X Junction

Phase Control of Majorana Bound States in a Topological X Junction

Bending effect on the Majorana bound states in planar Josephson junctions

Fusion of Majorana Bound States with Mini-Gate Control in Two-Dimensional Systems

Contact Info

Product

Resources

About