Andreev reflection at the interface of a normal Weyl semimetal and a superconducting type-II Weyl semimetal

Azizi, Alireza; Abdollahipour, Babak

doi:10.1103/physrevb.102.024512

Cited by 9 publications

(6 citation statements)

References 53 publications

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“…[13,14] There is also theoretical studies in systems based on topological Weyl semimetals. [15][16][17][18][19][20] However, perfect ARs occur only for electrons incident from a certain direction, or a careful preparation of the interface is essential in these systems. [15][16][17][18][19][20] A topological Anderson insulator (TAI) is a special nontrivial phase induced by an Anderson insulator.…”

Section: Introductionmentioning

confidence: 99%

“…[15][16][17][18][19][20] However, perfect ARs occur only for electrons incident from a certain direction, or a careful preparation of the interface is essential in these systems. [15][16][17][18][19][20] A topological Anderson insulator (TAI) is a special nontrivial phase induced by an Anderson insulator. [21][22][23][24] With no disorder, it is a normal metal with spin-orbital coupling.…”

Section: Introductionmentioning

confidence: 99%

“…[ 13,14 ] There is also theoretical studies in systems based on topological Weyl semimetals. [ 15–20 ] However, perfect ARs occur only for electrons incident from a certain direction, or a careful preparation of the interface is essential in these systems. [ 15–20 ]…”

Section: Introductionmentioning

confidence: 99%

“…[ 15–20 ] However, perfect ARs occur only for electrons incident from a certain direction, or a careful preparation of the interface is essential in these systems. [ 15–20 ]…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…[ 15–20 ] However, perfect ARs occur only for electrons incident from a certain direction, or a careful preparation of the interface is essential in these systems. [ 15–20 ]…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

Zhang

2021

Physica Status Solidi (b)

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“…In SAR process, an incident electron will be specularly reflected as the hole. Up to now, the SAR is discovered and studied extensively in the monolayer graphene [10][11][12][13][14][15][16][17] , bilayer graphene [18][19][20] , topological insulator 21 , Weyl semimetal [22][23][24] , nodal-line semimetal 25 , etc.…”

Section: Introductionmentioning

confidence: 99%

Specular Andreev reflection and its detection

Cheng,

Sun

2021

Preprint

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We propose a universal method to detect the specular Andreev reflection taking the simple twodimensional Weyl nodal-line semimetal−superconductor double-junction structure as an example. The quasiclassical quantization conditions are established for the energy levels of bound states formed in the middle semimetal along a closed path. The establishment of the conditions is completely based on the intrinsic character of the specularly reflected hole which has the same sign relation of its wave vector and group velocity with the incident electron. This brings about the periodic oscillation of conductance with the length of the middle semimetal, which is lack for the retro-Andreev reflected hole having the opposite sign relation with the incident electron. The positions of the conductance peaks and the oscillation period can be precisely predicted by the quantization conditions. Our detection method is irrespective of the details of the materials, which may promote the experimental detection of and further researches on the specular Andreev reflection as well as its applications in superconducting electronics.

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Crossed Andreev reflection in FSF Weyl semimetal junctions

Azizi¹,

Abdollahipour²

2021

J. Phys. D: Appl. Phys.

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We have investigated crossed Andreev reflection in a ferromagnet-superconductor-ferromagnet junction based on the time-reversal invariant Weyl semimetals. We demonstrate that this junction can provide a suitable platform for generating pure crossed Andreev reflection signals. For bipolar junction, n-doped left ferromagnet and p-doped right ferromagnet, pure co-tunneling can happen in the antiparallel configuration of the magnetizations of ferromagnets, while a pure crossed Andreev reflection is possible only in the parallel configuration. However, when both of the ferromagnetic leads have the same polarity, n-doped or p-doped, the situation is reversed. Furthermore, we find that we can tune the chemical potentials and magnetizations of the ferromagnets separately to on or off co-tunneling and crossed Andreev reflection signals. Moreover, we show that the pure crossed Andreev reflection signal can be enhanced by tuning the chemical potentials of two ferromagnetic leads. Our findings may be employed for generating entangled electron pairs in the condensed matter systems.

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Andreev reflection at the interface of a normal Weyl semimetal and a superconducting type-II Weyl semimetal

Cited by 9 publications

References 53 publications

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

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

Specular Andreev reflection and its detection

Crossed Andreev reflection in FSF Weyl semimetal junctions

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