Electric field tunable superconductor-semiconductor coupling in Majorana nanowires

@article{deMoor2018ElectricFT,
  title={Electric field tunable superconductor-semiconductor coupling in Majorana nanowires},
  author={Michiel W. A. de Moor and Jouri D. S. Bommer and Di Xu and G. W. Winkler and Andrey Antipov and Arno Bargerbos and Guanzhong Wang and Nick van Loo and R. L. M. Op het Veld and Sa{\vs}a Gazibegovi{\'c} and Diana Car and John A Logan and Mihir Pendharkar and Joon Sue Lee and Erik P A M Bakkers and Chris J. Palmstr{\o}m and R. M. Lutchyn and L. P. Kouwenhoven and Hao Zhang},
  journal={New Journal of Physics},
  year={2018}
}
We study the effect of external electric fields on superconductor-semiconductor coupling by measuring the electron transport in InSb semiconductor nanowires coupled to an epitaxially grown Al superconductor. We find that the gate voltage induced electric fields can greatly modify the coupling strength, which has consequences for the proximity induced superconducting gap, effective g-factor, and spin-orbit coupling, which all play a key role in understanding Majorana physics. We further show… 

Figures from this paper

Effects of Gate-Induced Electric Fields on Semiconductor Majorana Nanowires
We study the effect of gate-induced electric fields on the properties of semiconductor-superconductor hybrid nanowires which represent a promising platform for realizing topological superconductivity
Spin-Orbit Protection of Induced Superconductivity in Majorana Nanowires.
TLDR
The approach identifies the direction of the spin-orbit field, which is strongly affected by the superconductor geometry and electrostatic gates, and reveals SOI with a strength of 0.15-0.35 eV Å.
Robust topological superconductivity in weakly coupled nanowire-superconductor hybrid structures
We investigate the role of the coupling between a spin-orbit coupled semiconductor nanowire and a conventional s-wave superconductor on the emergence of the topological superconducting phase with
Evidence for Majorana phases in the magnetoconductance of topological junctions based on two-dimensional electron gases
We calculate the linear conductance of a two-dimensional electron gas (2DEG)-based junction between a normal semiconductor section and a hybrid semiconductor-superconductor section, under
Unified numerical approach to topological semiconductor-superconductor heterostructures
We develop a unified numerical approach for modeling semiconductor-superconductor heterostructures. All the key physical ingredients of these systems - orbital effect of magnetic field,
Charge-Impurity Effects in Hybrid Majorana Nanowires
We address an outstanding problem that represents a critical roadblock in the development of the Majoranabased topological qubit using semiconductor-superconductor hybrid structures: the quantitative
Conductance smearing and anisotropic suppression of induced superconductivity in a Majorana nanowire
In a recent high-quality experimental work on normal metal--superconducting nanowire junctions arXiv:1807.01940 (2018), strong anisotropic suppression of induced superconductivity has been observed
Curvature of gap closing features and the extraction of Majorana nanowire parameters
Recent tunneling conductance measurements of Majorana nanowires show a strong variation in the magnetic field dependence of the superconducting gap among different devices. Here, we theoretically
Effects of the electrostatic environment on superlattice Majorana nanowires
Finding ways of creating, measuring and manipulating Majorana bound states (MBSs) in superconducting-semiconducting nanowires is a highly pursued goal in condensed matter physics. It was recently
Physical mechanisms for zero-bias conductance peaks in Majorana nanowires
Motivated by the need to understand and simulate the ubiquitous experimentally-observed zero-bias conductance peaks in superconductor-semiconductor hybrid structures, we theoretically investigate the
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 70 REFERENCES
Effects of Gate-Induced Electric Fields on Semiconductor Majorana Nanowires
We study the effect of gate-induced electric fields on the properties of semiconductor-superconductor hybrid nanowires which represent a promising platform for realizing topological superconductivity
Dimensional crossover in spin-orbit-coupled semiconductor nanowires with induced superconducting pairing
We show that the topological Majorana modes in nanowires much longer than the superconducting coherence length are adiabatically connected with discrete zero-energy states generically occurring in
Superconductor-nanowire devices from tunneling to the multichannel regime: Zero-bias oscillations and magnetoconductance crossover
We present transport measurements in superconductor-nanowire devices with a gated constriction forming a quantum point contact. Zero-bias features in tunneling spectroscopy appear at finite magnetic
Majorana fermions and a topological phase transition in semiconductor-superconductor heterostructures.
TLDR
The measurement of the supercurrent through the junction allows one to discern topologically distinct phases and observe a topological phase transition by simply changing the in-plane magnetic field or the gate voltage, which will be a direct demonstration of the existence of Majorana particles.
Hard gap in epitaxial semiconductor-superconductor nanowires.
TLDR
The hard gap induced by the proximity effect in a semiconductor, using epitaxial InAs-Al semiconductor-superconductor nanowires, makes this new hybrid system attractive for a number of applications, as well as fundamental studies of mesoscopic superconductivity.
Spin-orbit interaction in InSb nanowires
We use magnetoconductance measurements in dual-gated InSb nanowire devices, together with a theoretical analysis of weak antilocalization, to accurately extract spin-orbit strength. In particular, we
Proximity and Josephson effects in superconductor-two-dimensional electron gas planar junctions
Abstract The DC Josephson effect is theoretically studied in a planar junction in which a two-dimensional electron gas (2DEG) infinite in lateral directions is in contact with two superconducting
Zeeman and spin-orbit effects in the Andreev spectra of nanowire junctions
We study the energy spectrum and the electromagnetic response of Andreev bound states in short Josephson junctions made of semiconducting nanowires. We focus on the joint effect of Zeeman and
Ballistic superconductivity in semiconductor nanowires
TLDR
The structural and chemical analyses demonstrate a high-quality interface between the nanowire and a NbTiN superconductor that enables ballistic transport and pave the way for disorder-free Majorana devices.
Effects of the electrostatic environment on the Majorana nanowire devices
One of the promising platforms for creating Majorana bound states is a hybrid nanostructure consisting of a semiconducting nanowire covered by a superconductor. We analyze the previously disregarded
...
1
2
3
4
5
...