Pseudospin-valve effect on transport in junctions of three-dimensional topological insulator surfaces

Roy, Sthitadhi; Roychowdhury, Krishanu; Das, Sourin

doi:10.1088/1367-2630/18/7/073038

Cited by 5 publications

(3 citation statements)

References 23 publications

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“…However, much less attention has been paid to the study of the emergent pseudospin or orbital degree of freedom that appears in many of these materials. A notable exception are the works by Roy et al [43,44], which show that the orbital pseudo spin polarization [45] of surface states of 3D topological insulators can have strong physical manifestations. Tunneling between two surfaces of topological insulators were show to be suppressed due to mismatch of the orbital pseudo spin on the two surfaces even though all other dispersing degrees of freedom allow tunneling.…”

Section: Introductionmentioning

confidence: 99%

Fabry–Perot interferometry in Weyl semi-metals

Mukherjee

Rao²,

Das³

2018

J. Phys.: Condens. Matter

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We show that the electrical transport across a minimal model for a time-reversal symmetry breaking Weyl semi-metal (WSM) involving two Weyl nodes can be interpreted as an interferometer in momentum space. The interference phase depends on the distance between the Weyl nodes () and is anisotropic. It is further shown that a minimal inversion symmetry broken model for a WSM with four Weyl nodes effectively mimics a situation corresponding to having two copies of the interferometer due to the presence of an orbital pseudo-spin domain wall in momentum space. We point out that the value of the and consequently the interference phase can be tuned by driving the WSMs resulting in oscillations in the two terminal conductance measured in the direction of splitting of the Weyl nodes.

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Section: Introductionmentioning

confidence: 99%

Fabry–Perot interferometry in Weyl semi-metals

Mukherjee

Rao²,

Das³

2018

J. Phys.: Condens. Matter

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show abstract

“…However, much less attention has been paid to the study of the emergent pseudo-spin or orbital degree of freedom that appears in many of these materials. A notable exception are the works by Roy et al [44,45], which show that the orbital pseudo spin polarization [46] of surface states of three dimensional topological insulators can have strong physical manifestations. Tunneling between two surfaces of topological insulators were show to be suppressed due to mismatch of the orbital pseudo spin on the two surfaces even though all other dispersing degrees of freedom allow tunneling.…”

Section: Introductionmentioning

confidence: 99%

Fabry-Perot interferometry in Weyl semi-metals

Mukherjee,

Rao,

Das

2017

Preprint

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We show that the electrical transport across a minimal model for a time-reversal symmetry(TRS) breaking Weyl semi-metal (WSM) involving two Weyl nodes can be interpreted as an interferometer in momentum space. The interference phase depends on the distance between the Weyl nodes ( δk) and is anisotropic. It is further shown that a minimal inversion symmetry broken model for a WSM with four Weyl nodes effectively mimics a situation corresponding to having two copies of the interferometer due to the presence of an orbital pseudo-spin domain wall in momentum space. We point out that the value of the δk and consequently the interference phase can be tuned by driving the WSMs resulting in oscillations in the two terminal conductance measured in the direction of splitting of the Weyl nodes.

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“…It has been shown in Ref. [46] that the effect of such non-dispersing degree of freedom can lead to formation of sharp barrier for electron tunnelling at the junction between the two TIs. In our set-up, the two nanowires are different from each other due to this frozen degree of freedom owing to different radius R 1 and R 2 .…”

mentioning

confidence: 99%

Jackiw-Rebbi zero modes in non-uniform topological insulator nanowire

2019

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We theoretically investigate the emergence of Jackiw-Rebbi zero modes and their conductance signature in non-uniform topological insulator nano-wires. We modelled the non-uniform nano-wires as junction between two cylindrical nano-wires with different radius. In the limit of wire length being much larger than its radius, the surface state of the nanowire splits into one dimensional Dirac modes propagating along the axis of the cylinder owing to radial confinement. The sign of the mass gap in each of these Dirac mode is decided by angular momentum quantum number corresponding to the rotational motion of the electron about the axis of the cylindrical. Application of an external magnetic flux through the cylindrical nanowires enables us to tune the mass gap from positive to negative value across the junction. Due to this flux tunable band inversion, controlled by the external magnetic filed, Jackiw-Rebbi zero modes can be made to appear or disappear at the junction. We compute differential conductance of our topological insulator nanowire junction and show that a quantized conductance peak appears at zero-energy (zero-bias) in the presence of the Jackiw-Rebbi mode.arXiv:1902.06425v2 [cond-mat.mes-hall]

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Pseudospin-valve effect on transport in junctions of three-dimensional topological insulator surfaces

Cited by 5 publications

References 23 publications

Fabry–Perot interferometry in Weyl semi-metals

Fabry–Perot interferometry in Weyl semi-metals

Fabry-Perot interferometry in Weyl semi-metals

Jackiw-Rebbi zero modes in non-uniform topological insulator nanowire

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