Graphene nanoring as a tunable source of polarized electrons

Munárriz, J.; Domı́nguez-Adame, F.; Orellana, P. A.; Малышев, А. В.

doi:10.1088/0957-4484/23/20/205202

Cited by 20 publications

(21 citation statements)

References 26 publications

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“…To understand the observed smoothening of the conductance plateaus we also carried out numerical simulations within the nearest neighbor tight-binding approach for p z electrons of C atoms in graphene. [9,10,26,27] Simulations of GNCs samples without edge roughness do not show abrupt plateaus which, however, are revealed in long GNRs. The good agreement between theory and experiment leads us to the conclusion that quantum interference is responsible for the smooth plateaus observed in the conductance while edge disorder does not play any relevant role.…”

Section: Introductionmentioning

confidence: 94%

Quantized Electron Transport Through Graphene Nanoconstrictions

Clericò

Delgado-Notario

Saiz-Bretín

et al. 2018

Physica Status Solidi (a)

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Here, the quantization of Dirac fermions in lithographically defined graphene nanoconstrictions is studied. Quantized conductance is observed in single nanoconstrictions fabricated on top of a thin hexamethyldisilazane layer over a Si/SiO2 wafer. This nanofabrication method allows to obtain well defined edges in the nanoconstrictions, thus reducing the effects of edge roughness on the conductance. The occurrence of ballistic transport is proved and several size quantization plateaus are identified in the conductance at low temperature. Experimental data and numerical simulations show good agreement, demonstrating that the smoothening of the plateaus is not related to edge roughness but to quantum interference effects.

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Section: Introductionmentioning

confidence: 94%

Quantized Electron Transport Through Graphene Nanoconstrictions

Clericò

Delgado-Notario

Saiz-Bretín

et al. 2018

Physica Status Solidi (a)

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“…Among these structures, graphene nanorings stand out because of the straightforward way in which they exploit quantum interference effects. These effects could be used for designing new quantum interferometers [37][38][39][40] or spintronic devices [41,42]. Recently, we demonstrated theoretically that graphene nanorings might be useful as thermoelectric devices too [29].…”

Section: Recent Advances In Nanotechnology Enable the Fabrication Of mentioning

confidence: 99%

Lattice thermal conductivity of graphene nanostructures

Saiz-Bretín

Малышев

Domı́nguez-Adame

et al. 2018

Carbon

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Non-equilibrium molecular dynamics is used to investigate the heat current due to the atomic lattice vibrations in graphene nanoribbons and nanorings under a thermal gradient. We consider a wide range of temperature, nanoribbon widths up to 6 nm and the effect of moderate edge disorder. We find that narrow graphene nanorings can efficiently suppress the lattice thermal conductivity at low temperatures (∼ 100 K), as compared to nanoribbons of the same width.Remarkably, rough edges do not appear to have a large impact on lattice energy transport through graphene nanorings while nanoribbons seem more affected by imperfections. Furthermore, we demonstrate that the effects of hydrogensaturated edges can be neglected in these graphene nanostructures.

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“…This voltage allows us to control the current in the device, as thoroughly discussed in Refs. [27,28]. Assuming that electron-phonon scattering in our samples is reduced, we consider electrons in the fully coherent regime transferring ballistically through the system.…”

Section: Model and Formalismmentioning

confidence: 99%

Enhancing thermoelectric properties of graphene quantum rings

et al. 2015

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We study the thermoelectric properties of rectangular graphene rings connected symmetrically or asymmetrically to the leads. A side-gate voltage applied across the ring allows for the precise control of the electric current flowing through the system. The transmission coefficient of the rings manifest Breit-Wigner line shapes and/or Fano line shapes, depending on the connection configuration, the width of nanoribbons forming the ring and the side-gate voltage. We find that the thermopower and the figure of merit are greatly enhanced when the chemical potential is tuned close to resonances. Such enhancement is even more pronounced in the vicinity of Fano-like antiresonances which can be induced by a side-gate voltage independently of the geometry. This opens a possibility to use the proposed device as a tunable thermoelectric generator.

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Graphene nanoring as a tunable source of polarized electrons

Cited by 20 publications

References 26 publications

Quantized Electron Transport Through Graphene Nanoconstrictions

Quantized Electron Transport Through Graphene Nanoconstrictions

Lattice thermal conductivity of graphene nanostructures

Enhancing thermoelectric properties of graphene quantum rings

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