Giant persistent currents in quasiperiodic mesoscopic rings

Qiu, R.Z.; Hsueh, Wen–Jeng

doi:10.1016/j.physleta.2014.01.032

Cited by 8 publications

(5 citation statements)

References 34 publications

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“…A large part of the literature reported so far describes the phenomenon of persistent currents considering perfect periodic rings as well as completely random ones [13][14][15][16][17] . But a little less attention was paid to the quasi-periodic ring structures [18][19][20][21] which actually bridge the gap between these fully ordered and randomly disordered phases. However, the studies involving persistent current in quasi-periodic ring geometries are mostly confined within non-interacting picture and, to the best of our knowledge, no one has addressed its behavior in presence of spin-orbit (SO) interaction which can bring significant new features into light.…”

Section: Introductionmentioning

confidence: 99%

Anomalous magnetic response of a quasi-periodic mesoscopic ring in presence of Rashba and Dresselhaus spin-orbit interactions

Patra¹,

Maiti²

2016

Eur. Phys. J. B

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We investigate the properties of persistent charge current driven by magnetic flux in a quasiperiodic mesoscopic Fibonacci ring with Rashba and Dresselhaus spin-orbit interactions. Within a tight-binding framework we work out individual state currents together with net current based on second-quantized approach. A significant enhancement of current is observed in presence of spinorbit coupling and sometimes it becomes orders of magnitude higher compared to the spin-orbit interaction free Fibonacci ring. We also establish a scaling relation of persistent current with ring size, associated with the Fibonacci generation, from which one can directly estimate current for any arbitrary flux, even in presence of spin-orbit interaction, without doing numerical simulation. The present analysis indeed gives a unique opportunity of determining persistent current and has not been discussed so far.

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Section: Introductionmentioning

confidence: 99%

Anomalous magnetic response of a quasi-periodic mesoscopic ring in presence of Rashba and Dresselhaus spin-orbit interactions

Patra¹,

Maiti²

2016

Eur. Phys. J. B

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“…For each ring the total number of lattice sites (represented by red balls) is de ned by the parameter N. The rings are connected with each other through the lattice sites α, β and/or (α ′ , β ′ ). and multi-channel loop conductors , while too limited amount of works has been done in connected network [26,27], and most importantly the role of connectivity among the loops has not been well explored even today, to the best of our knowledge, which might be quite interesting. This is one of our key motivations behind this work.…”

Section: Introductionmentioning

confidence: 99%

Manipulation of circular currents in a coupled ring system: effects of connectivity and non-uniform disorder

Majhi¹,

Maiti²

2020

J. Phys.: Condens. Matter

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Considering a quantum network, here we propose two kinds of circular charge currents. These are referred as: net current in the full system and the current con ned within a particular segment of the network. The network is composed of two rings, where one of the rings is subjected to a magnetic ux. Depending on the connectivity among the rings a new kind of states, insensitive to the magnetic ux, is generated along with the current carrying states. Because of this, a pronounced oscillation in net current with lling factor appears which suggests a possible switching action. Appearance of these vanishing current carrying states gradually decreases with increasing the degree of connectivity between the rings. As long as the rings are coupled by using more than a single bond, a circular current of other kind appears in the ux free ring which induces a strong magnetic eld. The strength of this induced magnetic eld can be regulated selectively by tuning the magnetic ux in the other ring. This phenomenon can be utilized for spin switching and other spintronic applications. Finally, we examine the role of non-uniform disorder on these currents, and nd several atypical signatures. Our study can be generalized to any higher loop system for investigating magneto-transport properties.

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“…Introduction. -The phenomenon of circular current due to voltage bias in a nanojunction possessing single and/or multiple loops is relatively very less exposed [1][2][3][4][5] compared to the well-established non-decaying circular current in an isolated loop in the presence of magnetic flux [7][8][9][10][11][12][13][14][15][16][17][18]. For the latter case, the magnetic flux is responsible to break the symmetry among clockwise and counterclockwise propagating electronic waves which yields a net circular charge current that even persists when the flux is removed.…”

mentioning

confidence: 99%

“…For the latter case, the magnetic flux is responsible to break the symmetry among clockwise and counterclockwise propagating electronic waves which yields a net circular charge current that even persists when the flux is removed. This phenomenon is referred to as flux-driven circular current in an isolated loop conductor (not coupled to external baths) and has been extensively studied in the literature over the past several years [7][8][9][10][11][12][13][14][15][16][17][18].…”

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confidence: 99%

Bias-induced circular current in a loop nanojunction with AAH modulation: Role of hopping dimerization

Mondal,

Maiti

2024

EPL

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In this work, we investigate the interplay between correlated disorder and hopping dimerization on bias driven circularcurrent in a loop conductor that is clamped between two electrodes. The correlated disorder is introduced in site energies of thering in the form of Aubry-Andr\'e-Harper (AAH) model. Simulating the quantum system within a tight-binding framework all the resultsare worked out based on the wave-guide theory. Unlike transport current, circular current in the loop conductor can getenhanced with increasing disorder strength. This enhancement becomes much effective when hopping dimerization is included which istaken following the Su-Schrieffer-Heeger (SSH) model. The characteristic features of bias driven circular current are studied underdifferent input conditions and we find the results are robust for wide range of physical parameters. For the sakeof completeness, uncorrelated disorder is also considered. Our analysis may provide a new insight in analyzing transport behaviorin different disordered lattices in presence of additional restrictions in hopping integrals.

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Giant persistent currents in quasiperiodic mesoscopic rings

Cited by 8 publications

References 34 publications

Anomalous magnetic response of a quasi-periodic mesoscopic ring in presence of Rashba and Dresselhaus spin-orbit interactions

Anomalous magnetic response of a quasi-periodic mesoscopic ring in presence of Rashba and Dresselhaus spin-orbit interactions

Manipulation of circular currents in a coupled ring system: effects of connectivity and non-uniform disorder

Bias-induced circular current in a loop nanojunction with AAH modulation: Role of hopping dimerization

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