Mach-Zehnder interferometry using spin- and valley-polarized quantum Hall edge states in graphene

@article{Wei2017MachZehnderIU,
  title={Mach-Zehnder interferometry using spin- and valley-polarized quantum Hall edge states in graphene},
  author={Di S Wei and Toeno van der Sar and Javier D Sanchez-Yamagishi and Kenji Watanabe and Takashi Taniguchi and Pablo Jarillo-Herrero and Bertrand I. Halperin and Amir Yacoby},
  journal={Science Advances},
  year={2017},
  volume={3}
}
We realize an electronic Mach-Zehnder interferometer with quantum Hall edge channels along a pn junction in graphene. Confined to a two-dimensional plane, electrons in a strong magnetic field travel along the edge in one-dimensional quantum Hall channels that are protected against backscattering. These channels can be used as solid-state analogs of monochromatic beams of light, providing a unique platform for studying electron interference. Electron interferometry is regarded as one of the most… 
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References

SHOWING 1-10 OF 45 REFERENCES
An electronic Mach–Zehnder interferometer
TLDR
This device is the first electronic analogue of the optical Mach–Zehnder interferometer, and opens the way to measuring interference of quasiparticles with fractional charges, and is highly sensitive and exhibits very high visibility.
Tunable transmission of quantum Hall edge channels with full degeneracy lifting in split-gated graphene devices
TLDR
Gate-tunable selective transmission of integer and fractional quantum Hall edge channels through the quantum point contact is demonstrated, opening the door to quantum Hall interferometry and electron quantum optics experiments in the integer and quantum Hall regimes of graphene.
Finite-bias visibility dependence in an electronic Mach-Zehnder interferometer
We use an electronic Mach-Zehnder interferometer to explore the non-equilibrium coherence of the electron waves within the edge-states that form in the integral quantum Hall effect. The visibility of
Edge-state velocity and coherence in a quantum Hall Fabry-Pérot interferometer.
TLDR
Investigation of nonlinear transport in electronic Fabry-Pérot interferometers in the integer quantum Hall regime finds a checkerboardlike pattern of conductance oscillations as a function of dc bias and perpendicular magnetic field consistent with a crossover from skipping orbits to E-vector x B-vector drift at high fields.
Selective equilibration of spin-polarized quantum Hall edge states in graphene.
TLDR
The conductance in the bipolar regime is strongly suppressed, indicating that copropagating edge states, even with the same spin, do not equilibrate along PN interfaces, and is attributed to the formation of an insulating ν = 0 stripe at the PN interface.
Edge mixing dynamics in graphene p–n junctions in the quantum Hall regime
TLDR
Shot noise in the quantum Hall regime is finite in the bipolar regime, but is strongly suppressed in the unipolar regime, which is consistent with the theoretical prediction and gives microscopic evidence that the edge states are uniquely mixed along the p–n junction.
Two point-contact interferometer for quantum Hall systems
We propose a device, consisting of a Hall bar with two weak barriers, that can be used to study quantum interference effects in a strongly correlated system. We show how the device provides a way of
Experimental observation of the quantum Hall effect and Berry's phase in graphene
TLDR
An experimental investigation of magneto-transport in a high-mobility single layer of graphene observes an unusual half-integer quantum Hall effect for both electron and hole carriers in graphene.
Electronic Mach-Zehnder interferometer as a tool to probe fractional statistics
We study transport through an electronic Mach-Zehnder interferometer recently devised at the Weizmann Institute. We show that this device can be used to probe statistics of quasiparticles in the
Phase diagram for the ν=0 quantum Hall state in monolayer graphene
The $\nu=0$ quantum Hall state in a defect-free graphene sample is studied within the framework of quantum Hall ferromagnetism. We perform a systematic analysis of the pseudospin anisotropies, which
...
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5
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