Quantized Majorana conductance

  title={Quantized Majorana conductance},
  author={Hao Zhang and Chun-Xiao Liu and Sa{\vs}a Gazibegovi{\'c} and Di Xu and John A. Logan and Guanzhong Wang and Nick van Loo and Jouri D. S. Bommer and Michiel W. A. Moor and Diana Car and Roy Op het Veld and P. J. van Veldhoven and Sebastian Koelling and Marcel A. Verheijen and Mihir Pendharkar and Daniel J. Pennachio and Borzoyeh Shojaei and Joon Sue Lee and Chris J. Palmstr{\o}m and Erik P.A.M. Bakkers and Sankar Das Sarma and Leo P Kouwenhoven},
Majorana zero-modes—a type of localized quasiparticle—hold great promise for topological quantum computing. Tunnelling spectroscopy in electrical transport is the primary tool for identifying the presence of Majorana zero-modes, for instance as a zero-bias peak in differential conductance. The height of the Majorana zero-bias peak is predicted to be quantized at the universal conductance value of 2e2/h at zero temperature (where e is the charge of an electron and h is the Planck constant), as a… 

Zero-bias conductance peak in Dirac semimetal-superconductor devices

Majorana zero modes (MZMs), fundamental building blocks for realizing topological quantum computers, can appear at the interface between a superconductor and a topological material. One of the

Quantized and unquantized zero-bias tunneling conductance peaks in Majorana nanowires: Conductance below and above 2e2/h

Majorana zero modes can appear at the wire ends of a one-dimensional topological superconductor and manifest themselves as a quantized zero-bias conductance peak in the tunneling spectroscopy of

Quantized zero-bias conductance plateau in semiconductor-superconductor heterostructures without topological Majorana zero modes

We show that partially separated Andreev bound states (ps-ABSs), comprised of pairs of overlapping Majorana bound states (MBSs) emerging in quantum dot-semiconductor-superconductor heterostructures,

Quality factor for zero-bias conductance peaks in Majorana nanowire

Despite recent experimental progress towards observing large zero-bias conductance peaks (ZBCPs) as signatures of Majorana modes, confusion remains about whether Majorana modes have been observed.

Reproducing topological properties with quasi-Majorana states

Andreev bound states in hybrid superconductor-semiconductor devices can have near-zero energy in the topologically trivial regime as long as the confinement potential is sufficiently smooth. These

Ballistic Majorana nanowire devices

Majorana modes are zero-energy excitations of a topological superconductor that exhibit non-Abelian statistics1–3. Following proposals for their detection in a semiconductor nanowire coupled to an

Concomitant opening of a topological bulk-gap with an emerging Majorana edge-state

Majorana 'zero-modes' are expected to be immune to decoherence. The primary method for their characterization in a 1D topological superconductor, is measuring the tunneling current into the edge of

Quasiparticle gaps in multiprobe Majorana nanowires

We theoretically study a spin-orbit-coupled nanowire proximitized by a superconductor in the presence of an externally applied Zeeman field ("Majorana nanowire") with zero-energy Majorana bound

Nearly quantized conductance plateau of vortex zero mode in an iron-based superconductor

Observations of conductance plateaus as a function of tunnel coupling for zero-energy vortex bound states with values close to or even reaching the 2e2/h quantum conductance are reported.



Ballistic Majorana nanowire devices

Majorana modes are zero-energy excitations of a topological superconductor that exhibit non-Abelian statistics1–3. Following proposals for their detection in a semiconductor nanowire coupled to an

Electron temperature and tunnel coupling dependence of zero-bias and almost-zero-bias conductance peaks in Majorana nanowires

A one-dimensional semiconductor nanowire proximitized by a nearby superconductor may become a topological superconductor hosting localized Majorana zero modes at the two wire ends in the presence of

Zero-bias conductance peak in Majorana wires made of semiconductor/superconductor hybrid structures

Motivated by a recent experimental report Mourik et al. [Science 336, 1003 (2012)] claiming the likely observation of the Majorana mode in a semiconductor-superconductor hybrid structure, we study

Splitting of the zero-bias conductance peak as smoking gun evidence for the existence of the Majorana mode in a superconductor-semiconductor nanowire

Recent observations of a zero bias conductance peak in tunneling transport measurements in superconductor--semiconductor nanowire devices provide evidence for the predicted zero--energy Majorana

Phenomenology of the soft gap, zero-bias peak, and zero-mode splitting in ideal Majorana nanowires

We theoretically consider the observed soft gap in the proximity-induced superconducting state of semiconductor nanowires in the presence of spin-orbit coupling, Zeeman splitting, and tunneling

Measuring Majorana nonlocality and spin structure with a quantum dot

Robust zero-bias transport anomalies in semiconducting nanowires with proximity-induced superconductivity have been convincingly demonstrated in various experiments. While these are compatible with

Disentangling Majorana fermions from topologically trivial low-energy states in semiconductor Majorana wires

Majorana fermions (MFs) are predicted to occur as zero-energy bound states in semiconductor nanowire-superconductor structures. However, in the presence of disorder or smooth confining potentials,

Andreev bound states versus Majorana bound states in quantum dot-nanowire-superconductor hybrid structures: Trivial versus topological zero-bias conductance peaks

Motivated by an important recent experiment [Deng , Science 354, 1557 (2016)SCIEAS0036-807510.1126/science.aaf3961], we theoretically consider the interplay between Andreev and Majorana bound states

A zero-voltage conductance peak from weak antilocalization in a Majorana nanowire

We show that weak antilocalization by disorder competes with resonant Andreev reflection from a Majorana zero mode to produce a zero-voltage conductance peak of order e2/h in a superconducting

Scaling of Majorana Zero-Bias Conductance Peaks.

Results are consistent with theory, including a peak conductance that is proportional to tunnel coupling, saturates at 2e^{2}/h, decreases as expected with field-dependent gap, and collapses onto a simple scaling function in the dimensionless ratio of temperature and tunnel coupling.