Generating and controlling spin-polarized currents induced by a quantum spin Hall antidot

Dolcetto, Giacomo; Cavaliere, Fabio; Ferraro, Dario; Sassetti, Maura

doi:10.1103/physrevb.87.085425

Cited by 38 publications

(37 citation statements)

References 52 publications

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“…Our proposal is based on the edge states of two-dimensional (2D) topological insulators [21][22][23], whose properties are described in terms of counterpropagating channels characterized by spin-momentum locking. In the presence of interactions, these are described as helical Luttinger liquids (hLL) [24][25][26][27][28][29][30][31][32][33][34], whose first experimental manifestations have been recently observed [35]. Here, charge and spin sectors are connected and the presence of interactions implies the simultaneous fractionalization of both degrees of freedom [30,36].…”

Section: Introductionmentioning

confidence: 99%

Time-resolved pure spin fractionalization and spin-charge separation in helical Luttinger liquid based devices

et al. 2015

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Helical Luttinger liquids, appearing at the edge of two-dimensional topological insulators, represent a new paradigm of one-dimensional systems, where peculiar quantum phenomena can be investigated. Motivated by recent experiments on charge fractionalization, we propose a setup based on helical Luttinger liquids that allows one to time-resolve, in addition to charge fractionalization, also spin-charge separation and pure spin fractionalization. This is due to the combined presence of spin-momentum locking and interactions. We show that electric time-resolved measurements can reveal both charge and spin properties, avoiding the need of magnetic materials. Although challenging, the proposed setup could be achieved with present-day technologies, promoting helical liquids as interesting playgrounds to explore the effects of interactions in one dimension.

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Section: Introductionmentioning

confidence: 99%

Time-resolved pure spin fractionalization and spin-charge separation in helical Luttinger liquid based devices

et al. 2015

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“…The number of oscillations is related to the number of particles inside the dot, as can be deduced by the first term in Eq. (24). It is worth to note that parallel and antiparallel configurations differ by half an oscillation: since the number of oscillations is related to the total charge in the dot (including the background), this reflects the fact that a fractional charge is trapped between the barriers in the antiparallel configuration, while an integer charge is trapped in the parallel configuration.…”

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confidence: 99%

Coulomb blockade microscopy of spin-density oscillations and fractional charge in quantum spin Hall dots

et al. 2013

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We evaluate the spin density oscillations arising in quantum spin Hall quantum dots created via two localized magnetic barriers. The combined presence of magnetic barriers and spin-momentum locking, the hallmark of topological insulators, leads to peculiar phenomena: a half-integer charge is trapped in the dot for antiparallel magnetization of the barriers, and oscillations appear in the in-plane spin density, which are enhanced in the presence of electron interactions. Furthermore, we show that the number of these oscillations is determined by the number of particles inside the dot, so that the presence or the absence of the fractional charge can be deduced from the in-plane spin density. We show that when the dot is coupled with a magnetized tip, the spatial shift induced in the chemical potential allows to probe these peculiar features.

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“…The coupling of helical edge states to quantum dots and magnetic impurities has been addressed in several works. [28][29][30][31][32][33][34][35][36][37][38][39][40][41][42] A crucial ingredient for a net resistive…”

Section: -15mentioning

confidence: 99%

Transport in quantum spin Hall edges in contact to a quantum dot

Rizzo¹,

Camjayi²,

Arrachea³

2016

Phys. Rev. B

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We study the transport mechanisms taking place in a quantum spin Hall bar with an embedded quantum dot, where electrons localize and experience Coulomb interaction U as well as spin-flip processes λ. We solve the problem with non-equilibrium Green functions. We focus on the linear response regime and treat the many-body interactions with quantum Monte Carlo. The effects of U and λ are competitive and the induced transport takes place through different channels. The two mechanisms can be switched by changing the occupation of the dot with a gate voltage.

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Generating and controlling spin-polarized currents induced by a quantum spin Hall antidot

Cited by 38 publications

References 52 publications

Time-resolved pure spin fractionalization and spin-charge separation in helical Luttinger liquid based devices

Time-resolved pure spin fractionalization and spin-charge separation in helical Luttinger liquid based devices

Coulomb blockade microscopy of spin-density oscillations and fractional charge in quantum spin Hall dots

Transport in quantum spin Hall edges in contact to a quantum dot

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