Coherent Spin Amplification Using a Beam Splitter

Yan, Chenchen; Kumar, Sanjeev; Thomas, K. J.; See, P.; Farrer, I.; Ritchie, D. A.; Griffiths, Jonathan; Jones, G. A. C.; Pepper, M.

doi:10.1103/physrevlett.120.137701

Cited by 7 publications

(7 citation statements)

References 31 publications

(53 reference statements)

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“…[4][5][6][7][8][9] Of these, the 0.7(2e 2 /h) conductance anomaly, a plateau appearing just below the first conductance plateau, has been extensively investigated with considerable discussion on its origin, and this effect was linked to the intrinsic spin polarization within the 1D system by means of transverse electron focusing. [10][11][12] There have been various theoretical proposals on the possibility of nonmagnetic fractional conductance plateaux (below e 2 /h) in both 2D and 1D systems analogous to the fractional quantum Hall effect (FQHE). 13 I nt h eF Q H E ,t h ef r a c t i o n a l i z a t i o ni sp r i n c i p a l l yi nt h e form of odd-denominator fractions as a result of Coulomb interaction among electrons occupying the lowest Landau levels in the 2D system.…”

Section: Takedownmentioning

confidence: 99%

Formation of a non-magnetic, odd-denominator fractional quantized conductance in a quasi-one-dimensional electron system

Kumar

Pepper

Ritchie

et al. 2019

Applied Physics Letters

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We have investigated the transport properties of a two-dimensional electron gas confined to one dimension by voltages applied to a pair of split gates and an additional top gate deposited on the surface of the GaAs/AlGaAs heterostructure. At low carrier concentrations, <5 Â 10 10 cm À2 , in a wide 1D channel (700 nm), with an asymmetric confinement potential, the conductance plateaux in units of e 2 /h at 1 and 2/3 were observed. In the presence of a fixed in-plane magnetic field of 10 T, additional plateaux at 2/5 and 2/7 appeared with increasing asymmetry in confinement potential. The appearance of odd-denominator fractional states seems to originate from the zigzag formed when electrons are allowed to relax in the second dimension at the boundary of the 1D-2D transition.

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Section: Takedownmentioning

confidence: 99%

Formation of a non-magnetic, odd-denominator fractional quantized conductance in a quasi-one-dimensional electron system

Kumar

Pepper

Ritchie

et al. 2019

Applied Physics Letters

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“…where R 1 = 2 µm and R 2 = -2 µm are the radius of right and left surface of the lens, D = 2 µm is the thickness of lens, N r can be extracted from capacitance model 16,17 as…”

Section: Methodsmentioning

confidence: 99%

Demonstration of electron focusing using electronic lenses in low-dimensional system

Yan

Pepper

See

et al. 2020

Sci Rep

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We report an all-electric integrable electron focusing lens in n-type GaAs. It is shown that a pronounced focusing peak takes place when the focal point aligns with an on-chip detector. The intensity and full width half maximum (FWHM) of the focusing peak are associated with the collimation of injected electrons. To demonstrate the reported focusing lens can be a useful tool, we investigate characteristic of an asymmetrically gate biased quantum point contact with the assistance of focusing lens. A correlation between the occurrence of conductance anomaly in low conductance regime and increase in FWHM of focusing peak is observed. The correlation is likely due to the electron-electron interaction. The reported electron focusing lens is essential for a more advanced electron optics device. arXiv:2002.04307v1 [cond-mat.mes-hall]

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“…Interesting methods for studying the parameters of SOI, based on the geometric focusing of the electron beam by a transverse magnetic field in the presence of in-plane magnetic field were considered recently. [5,6] These techniques are described in more detail in the reviews. [7][8][9][10] Determining the SOI parameters is not an easy task, often requiring in addition to precision measurements, the special geometry of the samples.…”

Section: Introductionmentioning

confidence: 99%

Determination of the Rashba and Dresselhaus Spin–Orbit Interaction Parameters and g‐Factor from the Critical Points of the Spectrum in a 2D Electron Gas in an In‐Plane Magnetic Field

Tkach

2021

Physica Status Solidi (b)

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A 2D electron gas with spin–orbit interaction (SOI) is known to form an anisotropic system with van Hove singularities controllable by a parallel magnetic field. The conductivity tensors of this system in the presence of both Rashba and Dresselhaus SOIs is studied. It is found that the diagonal elements of the conductivity tensor have sharp dips when the Fermi level passes through the singularity point of a spectrum. The energy position of these dips at different orientations of the magnetic field allows one to determine both SOI constants and the Landé g‐factor. The dependencies of the surface charge concentration on the Fermi level show a sharp change in the slope near the minimum of the spectrum due to the jumps of the density of states, while the van Hove singularities are not noticeable. In a zero magnetic field, the conductivity tensor has off‐diagonal terms which change the sign when the Fermi level passes the saddle points of the spectrum. The off‐diagonal terms evidence the appearance of the Hall voltage caused by the anisotropy of the Fermi surface and the scattering process.

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Coherent Spin Amplification Using a Beam Splitter

Cited by 7 publications

References 31 publications

Formation of a non-magnetic, odd-denominator fractional quantized conductance in a quasi-one-dimensional electron system

Formation of a non-magnetic, odd-denominator fractional quantized conductance in a quasi-one-dimensional electron system

Demonstration of electron focusing using electronic lenses in low-dimensional system

Determination of the Rashba and Dresselhaus Spin–Orbit Interaction Parameters and g‐Factor from the Critical Points of the Spectrum in a 2D Electron Gas in an In‐Plane Magnetic Field

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