Interferometry of Klein tunnelling electrons in graphene quantum rings

Sousa, D. J. P. de; Chaves, Andrey; Pereira, J. Milton; Farias, G. A.

doi:10.1063/1.4973902

Cited by 12 publications

(14 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…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

View full text Add to dashboard Cite

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.

show abstract

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

View full text Add to dashboard Cite

show abstract

“…Klein tunneling 19 is one phenomenon in quantum electrodynamics implying the unimpeded penetration (i.e., perfect tunneling) of normally incident relativistic particles regardless of the height and width of potential barriers. Klein tunneling was firstly introduced into graphene 20 and there are extensive theoretical and experimental [43][44][45][46][47][48][49][50][51][52][53][54] and application studies [55][56][57][58][59] . In contrast to the isotropic MDF in graphene, the MDF in 8-Pmmn borophene is anisotropic and tilted, so the new feature for Klein tunneling is expected.…”

Section: Introductionmentioning

confidence: 99%

Oblique Klein tunneling in 8−Pmmn borophene p−n junctions

Zhang

Yang

2018

Phys. Rev. B

View full text Add to dashboard Cite

The 8-Pmmn borophene is one kind of new elemental monolayer, which hosts anisotropic and tilted massless Dirac fermions (MDF). The planar p-n junction (PNJ) structure as the basic component of various novel devices based on the monolayer material has attracted increasing attention. Here, we analytically study the transport properties of anisotropic and tilted MDF across 8-Pmmn borophene PNJ. Similar to the isotropic MDF across graphene junctions, perfect transmission exists but its direction departures the normal direction of borophene PNJ induced by the anisotropy and tilt, i.e., oblique Klein tunneling. The oblique Klein tunneling does not depend on the doping levels in N and P regions of PNJ as the normal Klein tunneling but depends on the junction direction. Furthermore, we analytically derive the special junction direction for the maximal difference between perfect transmission direction and the normal direction of PNJ and clearly distinguish the respective contribution of anisotropy and tilt underlying the oblique Klein tunneling. In light of the rapid advances of experimental technologies, we expect the oblique Klein tunneling to be observable in the near future.

show abstract

“…In Fig. 6, we show the eigenenergies nm of BLG with an MQR as functions of α 1 for fixed For conventional quantum rings (CQRs) formed by an electrostatic potential or by an etched boundary and based on a 2DEG and monolayer graphene, the Aharonov-Bohm (AB) effect has been studied both theoretically and experimentally [14,[40][41][42][43][44]. On the other hand, little attention has been paid to the AB effect for an MQR in a 2DEG.…”

Section: A Magnetic Quantum Dotmentioning

confidence: 99%

Electronic properties of bilayer graphene with magnetic quantum structures studied using the Dirac equation

Park,

Kim,

Kim

2021

Preprint

View full text Add to dashboard Cite

The electronic properties of bilayer graphene with a magnetic quantum dot and a magnetic quantum ring are investigated. The eigenenergies and wavefunctions of quasiparticle states are calculated analytically by solving decoupled fourth-order differential equations. For the magnetic quantum dot, in the case of a negative inner magnetic field, two peculiar characteristics of the eigenenergy evolution are found: (i) the energy eigenstates change in a stepwise manner owing to energy anticrossing and (ii) the quantum states approach zero energy. For the magnetic quantum ring, there is an angular momentum transition of eigenenergy as the inner radius of the ring varies, and the Aharonov-Bohm effect is observed in the eigenenergy spectra for both positive and negative magnetic fields inside the inner radius.

show abstract

Interferometry of Klein tunnelling electrons in graphene quantum rings

Cited by 12 publications

References 23 publications

Lattice thermal conductivity of graphene nanostructures

Lattice thermal conductivity of graphene nanostructures

Oblique Klein tunneling in 8−Pmmn borophene p−n junctions

Electronic properties of bilayer graphene with magnetic quantum structures studied using the Dirac equation

Contact Info

Product

Resources

About