Spin-dependent Klein tunneling in graphene: Role of Rashba spin-orbit coupling

Liu, Ming‐Hao; Bundesmann, Jan; Richter, Klaus

doi:10.1103/physrevb.85.085406

Cited by 73 publications

(61 citation statements)

References 63 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We shall focus on the linear regime of transport. Previous studies have considered Fano line shapes in graphene junctions [37,38], spin densities in nanoribbons [39] and superlattices [40], spin-dependent transmissions [41], and Klein (chiral) tunneling [42]. Here, we are mainly concerned with the voltages generated in response to a temperature difference (the Seebeck effect) [43].…”

Section: Introductionmentioning

confidence: 99%

Thermoelectric effects in graphene with local spin-orbit interaction

Alomar

Sánchez

2014

Phys. Rev. B

View full text Add to dashboard Cite

We investigate the transport properties of a graphene layer in the presence of Rashba spin-orbit interaction. Quite generally, spin-orbit interactions induce spin splittings and modifications of the graphene band structure. We calculate within the scattering approach the linear electric and thermoelectric responses of a clean sample when the Rashba coupling is localized around a finite region. We find that the thermoelectric conductance, unlike its electric counterpart, is quite sensitive to external modulations of the Fermi energy. Therefore, our results suggest that thermocurrent measurements may serve as a useful tool to detect nonhomogeneous spin-orbit interactions present in a graphene-based device. Furthermore, we find that the junction thermopower is largely dominated by an intrinsic term independently of the spin-orbit potential scattering. We discuss the possibility of canceling the intrinsic thermopower by resolving the Seebeck coefficient in the subband space. This causes unbalanced populations of electronic modes which can be tuned with external gate voltages or applied temperature biases.

show abstract

Section: Introductionmentioning

confidence: 99%

Thermoelectric effects in graphene with local spin-orbit interaction

Alomar

Sánchez

2014

Phys. Rev. B

View full text Add to dashboard Cite

show abstract

“…The difference between Dirac's equation, governing a two-spinor wavefunction in 2D, and Maxwell's equations in 3D limits this analogy. In particular Klein tunneling, which is also found for a smooth gate potential 25 or from a tightbinding calculation, 26 has no optical equivalent. Known phenomena from Mie scattering will appear in graphene in new guise to satisfy the absence of backscattering.…”

Section: Theorymentioning

confidence: 98%

Mie scattering analog in graphene: Lensing, particle confinement, and depletion of Klein tunneling

2013

View full text Add to dashboard Cite

Guided by the analogy to Mie scattering of light on small particles we show that the propagation of a Dirac-electron wave in graphene can be manipulated by a circular gated region acting as a quantum dot. Large dots enable electron lensing, while for smaller dots resonant scattering entails electron confinement in quasibound states. Forward scattering and Klein tunneling can be almost switched off for small dots by a Fano resonance arising from the interference between resonant scattering and the background partition.

show abstract

“…28,[52][53][54][55][56][57][58][59][60][61][62][63][64] In this paper we present a detailed symmetry analysis focusing on effective SOC Hamiltonians in a way that is complementary to Refs. [40,56,65].…”

Section: Introductionmentioning

confidence: 99%

Model spin-orbit coupling Hamiltonians for graphene systems

2017

View full text Add to dashboard Cite

We present a detailed theoretical study of effective spin-orbit coupling (SOC) Hamiltonians for graphene based systems, covering global effects such as proximity to substrates and local SOC effects resulting, for example, from dilute adsorbate functionalization. Our approach combines group theory and tight-binding descriptions. We consider structures with global point group symmetries D 6h , D 3d , D 3h , C6v, and C3v that represent, for example, pristine graphene, graphene mini-ripple, planar boron-nitride, graphene on a substrate and free standing graphone, respectively. The presence of certain spin-orbit coupling parameters is correlated with the absence of the specific point group symmetries. Especially in the case of C6v-graphene on a substrate, or transverse electric field-we point out the presence of a third SOC parameter, besides the conventional intrinsic and Rashba contributions, thus far neglected in literature. For all global structures we provide effective SOC Hamiltonians both in the local atomic and Bloch forms. Dilute adsorbate coverage results in the local point group symmetries C6v, C3v, and C2v which represent the stable adsorption at hollow, top and bridge positions, respectively. For each configuration we provide effective SOC Hamiltonians in the atomic orbital basis that respect local symmetries. In addition to giving specific analytic expressions for model SOC Hamiltonians, we also present general (no-go) arguments about the absence of certain SOC terms.

show abstract

Spin-dependent Klein tunneling in graphene: Role of Rashba spin-orbit coupling

Cited by 73 publications

References 63 publications

Thermoelectric effects in graphene with local spin-orbit interaction

Thermoelectric effects in graphene with local spin-orbit interaction

Mie scattering analog in graphene: Lensing, particle confinement, and depletion of Klein tunneling

Model spin-orbit coupling Hamiltonians for graphene systems

Contact Info

Product

Resources

About