Incipient singlet-triplet states in a hybrid mesoscopic system

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

doi:10.1103/physrevb.97.241302

Cited by 5 publications

(4 citation statements)

References 41 publications

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“…This also applies to the case of the lateral quantization with the gap of ω x . Consequently, we can explain the diamond structure of the SBE lines in the V sd -V g plane observed in several QPC experiments [47][48][49][50][51][52][53][54][55][56][57][58]. The crossing points are at V sd = ±E Z /e, thus, as already employed [47], we can deduce the magnitude of the Zeeman gap, or the lateral quantization gap ( ω x ) from the diamond structure.…”

Section: B Zeeman Splitting Casementioning

confidence: 62%

“…This model attributes the disputed small plateau observed at approximately 0.7 •2e 2 /h to the perturbation effect: the perturbation effect opens a small gap at the crossing point (V sd = 0) of the SOI dispersion relation, which causes a small plateaulike conductance change. Furthermore, the peculiar SBE lines in the V g -V sd plane, which have been observed in many experiments such as [47][48][49][50][51][54][55][56][57], were reproduced comprehensively. The important features that agree with the experimental results are as follows: First, the SBE lines of the first diamond do not converge to V sd = 0 V, because the minima of the Rashba SOI dispersion deviate from V sd = 0.…”

Section: Soi Splitting Casementioning

confidence: 92%

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FT Sementes and the Expansion of Soybeans in Brazil

Junior¹,

Terasawa²,

Terasawa³

2017

Soybean Breeding

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One-dimensional quantized conductance is derived from the electrons in a homogeneous electric field by calculating the traveling time of the accelerated motion and the number of electrons in the one-dimensional region. As a result, the quantized conductance is attributed to the finite time required for ballistic electrons to travel a finite length. In addition, this model requires no Joule heat dissipation, even if the conductance is a finite value, because the electric power is converted to kinetic energy of electrons. Furthermore, the relationship between the non-equilibrium source-drain bias V sd and wavenumber k in a one-dimensional conductor is shown as k ∝ √ V sd . This correspondence accounts for the wavelength of the coherent electron flows emitted from a quantum point contact. Furthermore, it explains the anomalous 0.7 • 2e 2 /h (e is the elementary charge, and h is the Plank's constant) conductance plateau as a consequence of the perturbation gap at the crossing point of the wavenumber-directional-splitting dispersion relation. We propose that this splitting is caused by the Rashba spin-orbit interaction induced by the potential gradient of the quantum well at quantum point contacts.

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Section: B Zeeman Splitting Casementioning

confidence: 62%

Section: Soi Splitting Casementioning

confidence: 92%

FT Sementes and the Expansion of Soybeans in Brazil

Junior¹,

Terasawa²,

Terasawa³

2017

Soybean Breeding

View full text Add to dashboard Cite

show abstract

“…* cgold@phys.ethz.ch However, we recently found a method to significantly enhance the sensitivity at non-depleting voltages (weaklyinvasive regime) [15], thus reducing the influence of the tip onto the unperturbed system. This method utilizes a gate-defined open cavity structure [16][17][18], which concentrates the scattering density of states behind the quantum point contact and thereby enables scanning gate experiments at strongly reduced voltages applied to the scanning gate. In this paper, we operate such a structure in the nonlinear bias regime and find the interaction effects previously observed for electron injection into an open two-dimensional electron gas [13] in this modified setting.…”

Section: Introductionmentioning

confidence: 99%

Local signatures of electron-electron scattering in an electronic cavity

Gold,

Bräm,

Steinacher

et al. 2021

Preprint

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We image equilibrium and non-equilibrium transport through a two-dimensional electronic cavity using scanning gate microscopy (SGM). Injecting electrons into the cavity through a quantum point contact close to equilibrium, we raster-scan a weakly invasive tip above the cavity regions and measure the modulated conductance through the cavity. Varying the electron injection energy between ±2 meV, we observe that conductance minima turn into maxima beyond the energy threshold of ±0.6 meV. This observation bears similarity to previous measurements by Jura et al. [Jura et al., Phys. Rev. B 82, 155328 (2010)] who used a strongly invasive tip potential to study electron injection into an open two-dimensional electron gas. This resemblance suggests a similar microscopic origin based on electron-electron interactions.

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“…Recently, an accommodation for these two competing requirements of weakly invasive tip-potential and sufficient signal strength was found [26,30]. An open resonator structure of intermediate size [31][32][33] confines only fundamental one-dimensional cavity modes which can be uniquely identified and addressed [30]. This holds true even in slightly less open resonators [26].…”

Section: Introductionmentioning

confidence: 99%

Imaging signatures of the local density of states in an electronic cavity

Gold,

Bräm,

Ferguson

et al. 2020

Preprint

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We use Scanning Gate Microscopy to study electron transport through an open, gate-defined resonator in a Ga(Al)As heterostructure. Raster-scanning the voltage-biased metallic tip above the resonator, we observe distinct conductance modulations as a function of the tip-position and voltage. Quantum mechanical simulations reproduce these conductance modulations and reveal their relation to the partial local density of states in the resonator. Our measurements illustrate the current frontier between possibilities and limitations in imaging the local density of states in buried electron systems using scanning gate microscopy.

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Incipient singlet-triplet states in a hybrid mesoscopic system

Cited by 5 publications

References 41 publications

FT Sementes and the Expansion of Soybeans in Brazil

FT Sementes and the Expansion of Soybeans in Brazil

Local signatures of electron-electron scattering in an electronic cavity

Imaging signatures of the local density of states in an electronic cavity

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