Enhancement Mechanism of the Electron<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>g</mml:mi></mml:math>Factor in Quantum Point Contacts

Vionnet, Grégoire; Sushkov, O. P.

doi:10.1103/physrevlett.116.126801

Cited by 5 publications

(7 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…33,62,63) and theoretically indicated in Ref. 31,[49][50][51] Along with the exchange interaction, the Zeeman gap can have the contribution of the spin-orbit interaction, as speculated in our previous work . 30) However, as Ref.…”

Section: Resultssupporting

confidence: 60%

“…31) For this region, the parabolic confinement due to B z contributes to the apparent enhancement in the splitting . 31,50) We consider that the electron-electron many-body interaction is the underlying cause of the enhanced g-factor. In an earlier experiment, Thomas et al 62) observed 0.5 plateau that suggests a spin polarized state in zero magnetic field, in which the lower density enhances the many-body interaction.…”

Section: Resultsmentioning

confidence: 99%

“…In the experiments above, enhancements in g-factor were reported that deserved theoretical attention . 31,[49][50][51][52][53] Thus, we believe that further elaborated studies for double-layer GaAs/AlGaAs QPC systems in the presence of an out-of-plane magnetic field will provide valuable information on spin manipulation and spin filtering.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Large Zeeman Splitting in Out-of-Plane Magnetic Field in a Double-Layer Quantum Point Contact

Terasawa,

Norimoto,

Arakawa

et al. 2021

Preprint

View full text Add to dashboard Cite

In this study, we observe that the conductance of a quantum point contact on a GaAs/AlGaAs double quantum well depends significantly on the magnetic field perpendicular to the twodimensional electron gas. In the presence of the magnetic field, the subband edge splitting due to the Zeeman energy reaches 0.09 meV at 0.16 T, thereby suggesting an enhanced g-factor.The estimated g-factor enhancement is 17.5 times that of the bare value. It is considered that a low electron density and high mobility makes it possible to reach a strong many-body interaction regime in which this type of strong enhancement in g-factor can be observed.

show abstract

Section: Resultssupporting

confidence: 60%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Large Zeeman Splitting in Out-of-Plane Magnetic Field in a Double-Layer Quantum Point Contact

Terasawa,

Norimoto,

Arakawa

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…The exchange interaction is known to lead to an enhanced g-factor for spin splitting. [6][7][8][9][10][11] Recent scanning gate experiments, investigating edge stripes passing quantum point contacts at high B, 12 indicate modified screening behavior within the compressible stripes. Furthermore, a very recent investigation of the local nature of compressibility in the bulk of a IQH sample strongly challenges existing single-particle theories.…”

Section: Introductionmentioning

confidence: 99%

“…exchange interactions, are not included in the CSG approach. Nevertheless the observed exchange-induced spin-splitting of LLs 7,10,11,15 can be modelled phenomenologically by introducing an effective g-factor enhancement. 10 Theoretical descriptions 7,16 of the enhancement predict a characteristic ν factor dependence of almost vanishing enhanced g at even integer ν and maximal enhancement at odd integer ν.…”

Section: Introductionmentioning

confidence: 99%

Manifestation of many-body interactions in the integer quantum Hall effect regime

Oswald

Römer

2017

Phys. Rev. B

View full text Add to dashboard Cite

We use the self-consistent Hartree-Fock approximation for numerically addressing the integer quantum Hall (IQH) regime in terms of many-body physics at higher Landau levels (LL). The results exhibit a strong tendency to avoid the simultaneous existence of partly filled spin-up and spin-down LLs. Partly filled LLs appear as a mixture of coexisting regions of full and empty LLs. We obtain edge stripes with approximately constant filling factor ν close to half-odd filling at the boundaries between the regions of full and empty LLs, which we explain in terms of the g-factor enhancement as a function of a locally varying ν across the compressible stripes.The many-particle interactions follow a behaviour as it would result from applying Hund's rule for the occupation of the spin split LLs. The screening of the disorder and edge potential appears significantly reduced as compared to screening based on a Thomas-Fermi approximation. For addressing carrier transport, we use a non-equilibrium network model (NNM) that handles the lateral distribution of the experimentally injected non-equilibrium chemical potentials µ. PACS numbers: 73.43.-f, 73.43.Nq, 73.23.-b arXiv:1707.01364v1 [cond-mat.mes-hall] 5 Jul 2017 which allows seamless integration to the self-consistent Hartree-Fock approach of section II A (here ν denotes SUPPORTING INFORMATION

show abstract

Effect of Split Gate Size on the Electrostatic Potential and 0.7 Anomaly within Quantum Wires on a Modulation-DopedGaAs/AlGaAsHeterostructure

et al. 2016

View full text Add to dashboard Cite

We study 95 split gates of different size on a single chip using a multiplexing technique. Each split gate defines a one-dimensional channel on a modulation-doped GaAs/AlGaAs heterostructure, through which the conductance is quantized. The yield of devices showing good quantization decreases rapidly as the length of the split gates increases. However, for the subset of devices showing good quantization, there is no correlation between the electrostatic length of the one dimensional channel (estimated using a saddle point model), and the gate length. The variation in electrostatic length and the one-dimensional subband spacing for devices of the same gate length exceeds the variation in the average values between devices of different length. There is a clear correlation between the curvature of the potential barrier in the transport direction and the strength of the "0.7 anomaly": the conductance value of the 0.7 anomaly reduces as the barrier curvature becomes shallower. These results highlight the key role of the electrostatic environment in one-dimensional systems. Even in devices with clean conductance plateaus, random fluctuations in the background potential are crucial in determining the potential landscape in the active device area such that nominally identical gate structures have different characteristics.

show abstract

Enhancement Mechanism of the ElectrongFactor in Quantum Point Contacts

Cited by 5 publications

References 26 publications

Large Zeeman Splitting in Out-of-Plane Magnetic Field in a Double-Layer Quantum Point Contact

Large Zeeman Splitting in Out-of-Plane Magnetic Field in a Double-Layer Quantum Point Contact

Manifestation of many-body interactions in the integer quantum Hall effect regime

Effect of Split Gate Size on the Electrostatic Potential and 0.7 Anomaly within Quantum Wires on a Modulation-DopedGaAs/AlGaAsHeterostructure

Contact Info

Product

Resources

About