# Helical quantum Hall phase in graphene on SrTiO3

@article{Veyrat2019HelicalQH, title={Helical quantum Hall phase in graphene on SrTiO3}, author={Louis Veyrat and Corentin D{\'e}prez and Alexis Coissard and Xiaoxi Li and Fr{\'e}d{\'e}ric Gay and Kenji Watanabe and Takashi Taniguchi and Zheng Vitto Han and Benjamin A. Piot and Hermann Sellier and Benjamin Sac'ep'e}, journal={Science}, year={2019}, volume={367}, pages={781 - 786} }

Controlling the interactions Near charge neutrality and subject to perpendicular magnetic fields, graphene is expected to become a ferromagnet with edge states not unlike those in two-dimensional topological insulators. Observing this effect experimentally has proven tricky because very large magnetic fields are needed to overcome the effect of electron-electron interactions, which drive the system to competing states. Instead of amping up the field, Veyrat et al. placed their graphene samples…

## 41 Citations

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ABSTARCT
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## References

SHOWING 1-10 OF 66 REFERENCES

### Observation of the fractional quantum Hall effect in graphene

- PhysicsNature
- 2009

The observation of the fractional quantum Hall effect in ultraclean, suspended graphene is reported and it is shown that at low carrier density graphene becomes an insulator with a magnetic-field-tunable energy gap.

### Emergence of Helical Edge Conduction in Graphene at the ν = 0 Quantum Hall State

- Physics
- 2016

The conductance of graphene subject to a strong, tilted magnetic field exhibits a dramatic change from insulating to conducting behavior with tilt-angle, regarded as evidence for the transition from…

### Evidence for a quantum spin Hall phase in graphene decorated with Bi2Te3 nanoparticles

- PhysicsScience Advances
- 2018

This work experimentally and theoretically study artificially enhanced spin-orbit coupling in graphene via random decoration with dilute Bi2Te3 nanoparticles to highlight a pathway to spintronics and quantum information applications in graphene-based quantum spin Hall platforms.

### Majorana Zero Modes in Graphene

- Physics
- 2015

A clear demonstration of topological superconductivity (TS) and Majorana zero modes remains one of the major pending goal in the field of topological materials. One common strategy to generate TS is…

### Tunable symmetry breaking and helical edge transport in a graphene quantum spin Hall state

- PhysicsNature
- 2014

Graphene has a quantum spin Hall state when it is subjected to a very large magnetic field angled with respect to the graphene plane, which constitutes a new kind of one-dimensional electronic system with a tunable bandgap and an associated spin texture.

### Graphene integer quantum Hall effect in the ferromagnetic and paramagnetic regimes

- Physics
- 2006

Starting from the graphene lattice tight-binding Hamiltonian with an on-site U and long-range Coulomb repulsion, we derive an interacting continuum Dirac theory governing the low-energy behavior of…

### Fractional quantum Hall effect and insulating phase of Dirac electrons in graphene

- PhysicsNature
- 2009

The quintessential collective quantum behaviour in two dimensions, the fractional quantum Hall effect (FQHE), has so far resisted observation in graphene despite intense efforts and theoretical predictions of its existence and it is believed that these results will open the door to the physics of FQHE and other collective behaviour in graphene.

### Spontaneous symmetry breakings in graphene subjected to in-plane magnetic field

- Physics
- 2007

Application of the magnetic field parallel to the plane of the graphene sheet leads to the formation of electron- and holelike Fermi surfaces. Such situation is shown to be unstable with respect to…

### Observation of even denominator fractional quantum Hall effect in suspended bilayer graphene.

- PhysicsNano letters
- 2014

Low-temperature magneto-transport in recently developed, high-quality multiterminal suspended bilayer graphene devices, enabling the independent measurement of the longitudinal and transverse resistance, offers new possibilities to explore the microscopic nature of even-denominator fractional quantum Hall effect.

### Luttinger liquid at the edge of undoped graphene in a strong magnetic field.

- PhysicsPhysical review letters
- 2006

It is demonstrated that an undoped two-dimensional carbon plane (graphene) whose bulk is in the integer quantum Hall regime supports a nonchiral Luttinger liquid at an armchair edge, and has a power law tunneling I-V with a nonintegral exponent.