Josephson signatures of Weyl node creation and annihilation in irradiated Dirac semimetals

Fu, Pei-Hao; Wang, Jun; Liu, Junfeng; Wang, Rui-Qiang

doi:10.1103/physrevb.100.115414

Cited by 14 publications

(8 citation statements)

References 72 publications

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“…In the presence of optical light, the time-dependent Hamiltonian can be described by Peierls substitution H(𝑞,t) = H(𝑞 + e𝐴(t)/h). Here we focus on the high driving frequency ω greater than the static energy bandwidth, so that an effective Hamiltonian reads [34][35][36][37][38] H…”

Section: Modelmentioning

confidence: 99%

Josephson current in an irradiated Weyl semimetal junction*

Wang¹,

Shen²

2021

Chinese Phys. B

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The influence of the off-resonant circularly polarized light on the Josephson current in the time-reversal broken superconducting Weyl semimetal junctions is investigated by using the Bogoliubov–de Gennes equation and the transfer matrix approach. Both the zero momentum BCS pairing states and the finite momentum Fulde–Ferrell–Larkin–Ovchinnikov (FFLO) pairing states are considered for the Weyl superconductors. When a circularly polarized light is applied, it is shown that the current phase relation remains unchanged for the BCS pairing with the increasing of incident radiation intensity A 0. For FFLO pairing, the Josephson current exhibits the 0–π transition and periodic oscillation as a function of A 0. The dependence of free energy and critical current on A 0 are also investigated.

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Section: Modelmentioning

confidence: 99%

Josephson current in an irradiated Weyl semimetal junction*

Wang¹,

Shen²

2021

Chinese Phys. B

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“…Generally, a fourfold degenerate Dirac point is composed of two double degenerate Weyl points with opposite chirality 15 . Thus a pair of Weyl nodes with two different spin subbands can be created from each Dirac node by a time-reversal breaking perturbation, such as high-frequency illumination 20 – 22 or a magnetic field 23 , 24 . There are many transport experiments and applications on these new materials 25 , 26 , including superconductivity 27 – 30 , Aharonov-Bohm interference 31 , 32 and higher-order topological states 33 .…”

Section: Introductionmentioning

confidence: 99%

Electrically controlled spin polarized current in Dirac semimetals

et al. 2021

Sci Rep

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We propose a highly tunable $$100\%$$ 100 % spin-polarized current generated in a spintronic device based on a Dirac semimetal (DSM) under a magnetic field, which can be achieved merely by controlling electrical parameters, i.e. the gate voltage, the chemical potential in the lead and the coupling strength between the leads and the DSM. These parameters are all related to the special properties of a semimetal. The spin polarized current generated by gate voltage is guaranteed by its semimetallic feature, because of which the density of state vanishes near Dirac nodes. The barrier controlled current results from the different distance of Weyl nodes generated by the Zeeman field. And the coupling strength controlled spin polarized current originates from the surface Fermi arcs. This DSM-based spintronic device is expected to be realized in $$\hbox {Cd}_{3}\hbox {As}_{2}$$ Cd 3 As 2 experimentally.

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“…A fourfold degenerate Dirac point is composed of two double degenerate Weyl points with opposite chirality 15 . So a pair of Weyl nodes with two different spin subbands can be created from each Dirac node if a time-reversal (TR) breaking perturbation, such as high-frequency illumination [21][22][23] or a magnetic field is presented 24,25 . The separation of spin subbands makes the system become a potential topological spintronics device.…”

Section: Introductionmentioning

confidence: 99%

Electrically controlled spin polarized current in Dirac semimetals

Liu

et al. 2021

Preprint

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We propose a highly tunable 100% spin-polarized current generated in a spintronics device based on Dirac semimetal under a magnetic field, which can be achieved merely by controlling electric parameters, i.e. the gate voltage, the barrier in the lead and the coupling strength between the leads and Dirac semimetal. These parameters are all related to the special properties of Dirac semimetal and Weyl semimetal. The spin polarized current generated by gate voltage is guaranteed by its semimetallic feature, because of which the density of state vanishes near Dirac nodes. The barrier controlled current results from the different distance of Weyl nodes generated by the Zeeman field. And the coupling strength controlled spin polarized current originate from the surface Fermi arcs. All these features make a great potential to realized Dirac semimetal based spintronic devices.

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Josephson signatures of Weyl node creation and annihilation in irradiated Dirac semimetals

Cited by 14 publications

References 72 publications

Josephson current in an irradiated Weyl semimetal junction*

Josephson current in an irradiated Weyl semimetal junction*

Electrically controlled spin polarized current in Dirac semimetals

Electrically controlled spin polarized current in Dirac semimetals

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