# Anomalous robustness of the ν=5/2 fractional quantum Hall state near a sharp phase boundary.

@article{Liu2011AnomalousRO, title={Anomalous robustness of the $\nu$=5/2 fractional quantum Hall state near a sharp phase boundary.}, author={Yang Liu and Dobromir Kamburov and Mansour Shayegan and Loren N. Pfeiffer and Ken W. West and Kirk W. Baldwin}, journal={Physical review letters}, year={2011}, volume={107 17}, pages={ 176805 } }

We report magnetotransport measurements in wide GaAs quantum wells with a tunable density to probe the stability of the fractional quantum Hall effect at a filling factor of ν=5/2 in the vicinity of the crossing between Landau levels (LLs) belonging to the different (symmetric and antisymmetric) electric subbands. When the Fermi energy (E(F)) lies in the excited-state LL of the symmetric subband, the 5/2 quantum Hall state is surprisingly stable and gets even stronger near this crossing, and… Expand

#### 12 Citations

Finite-thickness effect and spin polarization of the even-denominator fractional quantum Hall states

- Physics
- 2020

The spin-polarized even-denominator fractional quantum Hall (FQH) states in the second Landau level (LL), i.e. 5/2 and 7/2, may possess novel quasi-particle excitations obeying non-Abelian… Expand

Magneto-Transport Study of Quantum Phases in Wide GaAs Quantum Wells

- Physics
- 2014

In this thesis we study several quantum phases in very high quality two-dimensional electron systems (2DESs) confined to GaAs single wide quantum wells (QWs). In these systems typically two electric… Expand

Recent Experimental Progress of Fractional Quantum Hall Effect: 5/2 Filling State and Graphene

- Physics
- 2014

The phenomenon of fractional quantum Hall effect (FQHE) was first experimentally observed 33 years ago. FQHE involves strong Coulomb interactions and correlations among the electrons, which leads to… Expand

A cascade of phase transitions in an orbitally mixed half-filled Landau level

- Physics, Medicine
- Science Advances
- 2018

A cascade of phases with distinct magnetotransport features including a gapped phase polarized in the N = 1 level and a compressible phase in N = 0, along with an unexpected Fermi liquid, a second gapped, and a strongly anisotropic nematic-like phase at intermediate polarizations when the levels are near degeneracy are revealed. Expand

Exploring Quantum Hall Physics at Ultra-Low Temperatures and at High Pressures

- Physics
- Fractional Quantum Hall Effects
- 2020

The use of ultra-low temperature cooling and of high hydrostatic pressure techniques has significantly expanded our understanding of the two-dimensional electron gas confined to GaAs/AlGaAs… Expand

The Phase Diagram of the $\nu=5/2$ Fractional Quantum Hall Effect: Effects of Landau Level Mixing and Non-Zero Width

- Physics
- 2014

Interesting non-Abelian states, e.g., the Moore-Read Pfaffian and the anti-Pfaffian, offer candidate descriptions of the $\nu = 5/2$ fractional quantum Hall state. But the significant controversy… Expand

Finite-temperature behavior in the second Landau level of the two-dimensional electron gas

- Physics
- Physical Review B
- 2018

Reports of weak local minima in the magnetoresistance at $\nu=2+3/5$, $2+3/7$, $2+4/9$, $2+5/9$, $2+5/7$, and $2+5/8$ in the second Landau level of the electron gas in GaAs/AlGaAs left open the… Expand

Enigmatic 12/5 fractional quantum Hall effect

- Physics
- 2016

We numerically study the fractional quantum Hall effect at filling factors $\nu=12/5$ and 13/5 (the particle-hole conjugate of 12/5) in high-quality two-dimensional GaAs heterostructures via exact… Expand

Thickness-induced violation of de Haas-van Alphen effect through exact analytical solutions at a one-electron and a one-composite fermion level

- Physics
- 2013

A systematic study of the energetics of electrons in an interface in a magnetic field is reported with exact analytical calculations based on a Landau level (LL) picture, by serious consideration of… Expand

Impact of Heterostructure Design on Transport Properties in the Second Landau Level of In Situ Back-Gated Two-Dimensional Electron Gases

- Physics
- 2015

We report on transport in the second Landau level in in situ back-gated two-dimensional electron gases in GaAs/AlxGa1-xAs quantum wells. Minimization of gate leakage is the primary heterostructure… Expand

#### References

SHOWING 1-10 OF 15 REFERENCES

and M

- Shayegan, arXiv:1102.0070,
- 2011

Phys

- Rev. Lett., 105, 096802
- 2010

Phys

- Rev. Lett., 105, 176807
- 2010

Phys

- Rev. Lett., 105, 246808
- 2010

Phys

- Rev. Lett., 105, 246805
- 2010

Phys

- Rev. Lett., 103, 256802
- 2009

Phys

- Rev. B, 80, 201303
- 2009

Phys

- Rev. Lett., 101, 016807 (2008); Phys. Rev. B, 78, 155308
- 2008

Phys

- Rev. B, 77, 081301
- 2008