Effect of chiral anomaly on Andreev reflection in a tilted Weyl semimetal hybrid junction

Zhu, Chang-Yong; Xu, Wen-Hui; Zhou, Yunfeng; Ba, Jia-Yan; Deng, Ming-Xun; Duan, Hou-Jian; Wang, Rui-Qiang

doi:10.1103/physrevb.103.075148

Cited by 4 publications

(1 citation statement)

References 68 publications

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“…[19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35] Whereas, an opposite view, i.e., interband (intraband) conversion-induced ARR (SAR), was shown in the two-dimensional electron gas system with Rashba spin-orbit coupling, [36] the 8-Pmmn borophene (borophane)-based superconducting junction, [37][38][39] and the tilted Weyl semimetal hybrid junction. [40] Although only the intraband (interband) conversion-induced ARR (SAR) is believed to happen in graphene previously, in this work, we will show that the interband (intraband) conversion-induced ARR (SAR) can also happen in graphene by applying a uniaxial strain. Besides, we will show that the perfect Andreev reflection, electron-hole conversion with unit efficiency, exists at a nonzero incident angle in graphene, which breaks the previous view that the perfect Andreev reflection only happens at normal incidence in graphene.…”

Section: Introductionmentioning

confidence: 78%

Strain-modulated anisotropic Andreev reflection in a graphene-based superconducting junction

Zhou

Cao

et al. 2022

Chinese Phys. B

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We investigate the Andreev reflection across a uniaxial strained graphene-based superconducting junction. Compared with pristine graphene-based superconducting junction, three opposite properties are found. Firstly, in the regime of the intraband conversion of electron-hole, the Andreev retro-reflection happens. Secondly, in the regime of the interband conversion of electron-hole, the specular Andreev reflection happens. Thirdly, the perfect Andreev reflection, the electron-hole conversion with unit efficiency, happens at a nonzero incident angle of electron. These three exotic properties arise from the strain-induced anisotropic band structure of graphene, which breaks up the original relation between the direction of velocity of particle and the direction of the corresponding wavevector. Our finding gives an insight into the understanding of Andreev reflection and provides an alternative method to modulate Andreev reflection.

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Section: Introductionmentioning

confidence: 78%

Strain-modulated anisotropic Andreev reflection in a graphene-based superconducting junction

Zhou

Cao

et al. 2022

Chinese Phys. B

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A Perfect Andreev Reflection Induced by Anderson Disorder in a Normal–Superconductor Junction

Zhang

2021

Physica Status Solidi (b)

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The electronic transport properties of a 2D normal metal superconductor are studied by a nonequilibrium Green's function method. The normal metal is the non‐inverted HgTe/CdTe quantum well doped by electrons. It is found that Andreev reflection (AR) is enhanced in the weak disorder regime while weakened in the strong disorder regime. However, the AR coefficient can be perfect ( T normalA = 1 ) with vanished fluctuations in the moderate disorder regime, whereas other scattering processes are forbidden. The mechanism goes that Anderson disorder leads to a topological Anderson insulator with bulk states localized while edge states still extensive. Multiple ARs and spin‐momentum locking cooperate to vanish the normal reflection and leave AR only. A detailed numerical study shows that fixing the Fermi surface in conduction band, a large enough junction width, and a strong coupling between the normal and superconducting leads are necessary for perfect AR.

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Andreev reflections in deformed semi-Dirac material superconducting junctions

He,

Duan,

Zhu

et al. 2024

Physics Letters A

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Effect of chiral anomaly on Andreev reflection in a tilted Weyl semimetal hybrid junction

Cited by 4 publications

References 68 publications

Strain-modulated anisotropic Andreev reflection in a graphene-based superconducting junction

Strain-modulated anisotropic Andreev reflection in a graphene-based superconducting junction

A Perfect Andreev Reflection Induced by Anderson Disorder in a Normal–Superconductor Junction

Andreev reflections in deformed semi-Dirac material superconducting junctions

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