Spin transport in graphene superlattice under strain

Sattari, Farhad

doi:10.1016/j.jmmm.2016.04.054

Cited by 19 publications

(7 citation statements)

References 50 publications

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“…Furthermore, graphene has the capability of sustaining strain and deformations without rupture 36,37 . The application of strain to graphene layers can result in important and interesting phenomena [38][39][40][41][42][43][44][45][46][47] . For example, the interplay of massive electrons with spin orbit coupling in the presence of strain in a graphene layer yields controllable spatially separated spin-valley filtering 38,39 .…”

Section: Introductionmentioning

confidence: 99%

Tunable anomalous Andreev reflection and triplet pairings in spin-orbit-coupled graphene

2016

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We theoretically study scattering process and superconducting triplet correlations in a graphene junction comprised of ferromagnet-RSO-superconductor in which RSO stands for a region with Rashba spin orbit interaction. Our results reveal spin-polarized subgap transport through the system due to an anomalous equal-spin Andreev reflection in addition to conventional back scatterings. We calculate equal-and opposite-spin pair correlations near the F-RSO interface and demonstrate direct link of the anomalous Andreev reflection and equal-spin pairings arised due to the proximity effect in the presence of RSO interaction. Moreover, we show that the amplitude of anomalous Andreev reflection, and thus the triplet pairings, are experimentally controllable when incorporating the influences of both tunable strain and Fermi level in the nonsuperconducting region. Our findings can be confirmed by a conductance spectroscopy experiment and provide better insights into the proximity-induced RSO coupling in graphene layers reported in recent experiments 30,31,33,34.

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Section: Introductionmentioning

confidence: 99%

Tunable anomalous Andreev reflection and triplet pairings in spin-orbit-coupled graphene

2016

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“…Since the Hamiltonians H k 0 ( ) and H k 1 ( ) are 2×2 matrices, it is possible to analytically obtain H k eff ( ) using the addition rule of SU(2) (see appendix A for details). After some calculations and using equations (15) and (17), one gets,…”

Section: Touching Band Pointsmentioning

confidence: 99%

“…The fact that these edge states start and end at type II touching band points suggest that they have non-trivial topological properties. To study the topological properties of this kind of edge states we cannot proceed as we did with type I touching band points since type II touching band points do not correspond to points at where Hamiltonians (15) commute. Therefore, we analyze the topological properties of a one-dimensional slice of the system, in other words, we study our system for a fixed k x .…”

Section: B Type IImentioning

confidence: 99%

Topological phase-diagram of time-periodically rippled zigzag graphene nanoribbons

Roman‐Taboada

Naumis

2017

J. Phys. Commun.

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The topological properties of electronic edge states in time-periodically driven spatially-periodic corrugated zigzag graphene nanoribbons are studied. An effective one-dimensional Hamiltonian is used to describe the electronic properties of graphene and the time-dependence is studied within the Floquet formalism. Then the quasienergy spectrum of the evolution operator is obtained using analytical and numeric calculations, both in excellent agreement. Depending on the external parameters of the time-driving, two different kinds (types I and II) of touching band points are found, which have a Dirac-like nature at both zero and p  quasienergy. These touching band points are able to host topologically protected edge states for a finite size system. The topological nature of such edge states was confirmed by an explicit evaluation of the Berry phase in the neighborhood of type I touching band points and by obtaining the winding number of the effective Hamiltonian for type II touching band points. Additionally, the topological phase diagram in terms of the driving parameters of the system was built.

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“…where λ x = 2.2 and λ y = −1.3 are the logarithmic derivatives of the nearest-neighbor hopping with respect to the lattice parameter (a = 0.386 nm) at ε = 0 along the x and y directions, respectively. [63] Finally, the effective Hamiltonian is given by…”

Section: The Effective Hamiltonian Modelmentioning

confidence: 99%

Spin-valley Hall conductivity of doped ferromagnetic silicene under strain

Shirzadi

Yarmohammadi

2017

Chinese Phys. B

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The spin-valley Hall conductivity (SHC-VHC) of two-dimensional material ferromagnetic graphene's silicon analog, silicene, is investigated in the presence of strain within the Kubo formalism in the context of the Kane-Mele Hamiltonian. The Dirac cone approximation has been used to investigate the dynamics of carriers under the strain along the armchair (AC) direction. In particular, we study the effect of external static electric field on these conductivities under the strain. In the presence of the strain, the carriers have a larger effective mass and the transport decreases. Our findings show that SHC changes with respect to the direction of the applied electric field symmetrically while VHC increases independently. Furthermore, the reflection symmetry of the structure has been broken with the electric field and a phase transition occurs to topological insulator for strained ferromagnetic silicene. A critical strain is found in the presence of the electric field around 45%. SHC (VHC) decreases (increases) for strains smaller than this value symmetrically while it increases (decreases) for strains larger than one.

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Spin transport in graphene superlattice under strain

Cited by 19 publications

References 50 publications

Tunable anomalous Andreev reflection and triplet pairings in spin-orbit-coupled graphene

Tunable anomalous Andreev reflection and triplet pairings in spin-orbit-coupled graphene

Topological phase-diagram of time-periodically rippled zigzag graphene nanoribbons

Spin-valley Hall conductivity of doped ferromagnetic silicene under strain

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