Absence of evidence for chiral Majorana modes in quantum anomalous Hall-superconductor devices

@article{Kayyalha2020AbsenceOE,
  title={Absence of evidence for chiral Majorana modes in quantum anomalous Hall-superconductor devices},
  author={Morteza Kayyalha and Di Xiao and Ruoxi Zhang and Jaeho Shin and Jue Jiang and Fei Wang and Yi-Fan Zhao and Run Xiao and Ling Zhang and Kajetan M. Fijalkowski and Pankaj K Mandal and Martin Winnerlein and Charles Gould and Qi Li and Laurens W. Molenkamp and Moses H. W. Chan and Nitin Samarth and Cui-Zu Chang},
  journal={Science},
  year={2020},
  volume={367},
  pages={64 - 67}
}
Looking for chiral Majoranas Chiral Majorana modes have been predicted to exist in heterostructures consisting of a quantum anomalous Hall insulator and a superconductor. Kayyalha et al. fabricated more than 30 such samples and used transport measurements to look for signatures of the Majorana modes. The data indicated that the transport signatures previously thought to be associated with Majorana physics could, in their samples, be explained using a more mundane mechanism. Science, this issue… Expand
1D Majorana Goldstinos and extended supersymmetry in quantum wires
One-dimensional Majorana modes can be obtained as boundary excitations of topologically nontrivial twodimensional topological superconductors. Here, we propose instead the bottom-up creation ofExpand
1D Majorana fermions and supersymmetry in quantum wires
One-dimensional Majorana modes can be obtained as boundary excitations of topologically nontrivial twodimensional topological superconductors. Here, we propose instead the bottom-up creation ofExpand
In the Pursuit of Majorana Modes in Iron-Based High-Tc Superconductors
Majorana zero mode is an exotic quasi-particle excitation with non-Abelian statistics in topological superconductor systems, and can serve as the cornerstone for topological quantum computation, aExpand
Disordered quantum transport in quantum anomalous Hall insulator-superconductor junctions
In this communication, we numerically studied disordered quantum transport in a quantum anomalous Hall insulator-superconductor junction based on the effective edge model approach. In particular, weExpand
Multiple Majorana edge modes in magnetic topological insulator–superconductor heterostructures
We numerically investigate the electronic transport properties (i.e., electron tunneling and Andreev reflection) of a topological superconductor composed of a magnetic topological insulator andExpand
Chirality inversion of Majorana edge modes in a Fu–Kane heterostructure
Fu and Kane have discovered that a topological insulator with induced s-wave superconductivity (gap Δ0, Fermi velocity v F, Fermi energy μ) supports chiral Majorana modes propagating on the surfaceExpand
Emergent vortex Majorana zero mode in iron-based superconductors
  • Lingyuan Kong, Hong Ding
  • Physics
  • 2020
During the recent years, the iron-based superconductors with a topological band structure have attracted intensive attention from the science community as a new and promising platform for emergingExpand
Distinct Quantum Anomalous Hall Ground States Induced by Magnetic Disorders
The quantum anomalous Hall (QAH) effect in magnetic topological insulator (TI) represents a new state of matter originated from the interplay between topology and magnetism. The definingExpand
Experimental signature of parity anomaly in semi-magnetic topological insulator
A three-dimensional topological insulator features a two-dimensional surface state consisting of a single linearly-dispersive Dirac cone. Under broken time-reversal symmetry, the single Dirac cone isExpand
Disorder-induced chiral and helical Majorana edge modes in a two-dimensional Ammann-Beenker quasicrystal
Recent research on disorder effects in topological phases in quasicrystalline systems has received much attention. In this work, by numerically computing the (spin) Bott index and the thermalExpand
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 56 REFERENCES
Chiral Majorana fermion modes in a quantum anomalous Hall insulator–superconductor structure
TLDR
Transport measurements that suggest the existence of one-dimensional chiral Majorana fermion modes in the hybrid system of a quantum anomalous Hall insulator thin film coupled with a superconductor are reported. Expand
Disorder-induced half-integer quantized conductance plateau in quantum anomalous Hall insulator-superconductor structures
Recent experiments [Science 357, 294 (2017)] have observed a half-quantized electrical conductance plateau, a proposed signature of chiral Majorana fermions. Such Majoranas have been argued to occurExpand
Metal-to-insulator switching in quantum anomalous Hall states
TLDR
The experimental observation of the giant longitudinal resistance peak and zero Hall conductance plateau at the coercive field in the six quintuple-layer (Cr0.12Bi0.26Sb0.62)2Te3 film is reported and the universal QAHE phase diagram is confirmed through the angle-dependent measurements. Expand
Coincidence of superparamagnetism and perfect quantization in the quantum anomalous Hall state
Topological insulators doped with transition metals have recently been found to host a strong ferromagnetic state with perpendicular to plane anisotropy as well as support a quantum Hall state withExpand
Experimental Observation of the Quantum Anomalous Hall Effect in a Magnetic Topological Insulator
TLDR
The observation of the quantum anomalous Hall (QAH) effect in thin films of chromium-doped (Bi,Sb)2Te3, a magnetic topological insulator shows a plateau in the Hall resistance as a function of the gating voltage without any applied magnetic fields, signifying the achievement of the QAH state. Expand
Chiral topological superconductor and half-integer conductance plateau from quantum anomalous Hall plateau transition
Here, we propose to realize a two-dimensional chiral topological superconducting (TSC) state from the quantum anomalous Hall plateau transition in a magnetic topological insulator thin film throughExpand
Realization of the Axion Insulator State in Quantum Anomalous Hall Sandwich Heterostructures.
TLDR
Evidence for a phase of matter distinct from the established QAH state is shown and electrical transport measurements in a quantum anomalous Hall (QAH) sandwich heterostructure provide a promising platform for the realization of the TME effect. Expand
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. Expand
New directions in the pursuit of Majorana fermions in solid state systems.
  • J. Alicea
  • Physics, Medicine
  • Reports on progress in physics. Physical Society
  • 2012
TLDR
This review paper highlights recent advances in the condensed matter search for Majorana that have led many in the field to believe that this quest may soon bear fruit and discusses the most remarkable properties of condensed matter Majorana fermions-the non-Abelian exchange statistics that they generate and their associated potential for quantum computation. Expand
Scale-invariant quantum anomalous Hall effect in magnetic topological insulators beyond the two-dimensional limit.
TLDR
The extension of the QAHE into the three-dimensional thickness region addresses the universality of this quantum transport phenomenon and motivates the exploration of new QA HE phases with tunable Chern numbers. Expand
...
1
2
3
4
5
...