Andreev reflection in spin polarised superconductor
- PDF Magnetoanisotropic Andreev Reflection in Ferromagnet-Superconductor.
- [2203.05894] Crossed Andreev reflection in spin-polarized.
- Spin-Polarized Transport and Andreev Reflection in... - NASA/ADS.
- Zero bias anomaly in Andreev reflection spectroscopy.
- PDF Spin Polarization measurements of La MnO LSMO single crystals using.
- VZLWFKIURPVSLQ VLQJOHWWR Equal-spin Andreev reflection in.
- Probing spin polarization with Andreev reflection: A.
- Determination of spin polarization using an unconventional iron.
- Spin-polarized transport and Andreev reflection in.
- Andreev Reflection in the Fractional Quantum Hall State.
- [PDF] Spin-polarized transport and Andreev reflection in.
- Evidence for Crossed Andreev Reflections in 100YBasub 2Cu.
- Magnetoanisotropic Andreev Reflection in Ferromagnet-Superconductor.
- Nonlocal transistor based on pure crossed Andreev reflection in a EuO.
PDF Magnetoanisotropic Andreev Reflection in Ferromagnet-Superconductor.
Mar 11, 2022 This component enables non-local crossed Andreev reflection between the spin-polarized chiral edge states running on opposite sides of the superconducting finger, thus opening a gap in the spectrum of the edge states without the need of spin-orbit interaction or non-trivial magnetic textures.
[2203.05894] Crossed Andreev reflection in spin-polarized.
We study the transport properties of a voltage biased contact between two spin-split superconductors separated by an insulating barrier of arbitrary transparency. At low transparency, the contribution of multiple Andreev reflections leads to a subharmonic gap structure that crucially depends on the amplitude and relative angle of the spin-splitting fields of each superconductor. For non. In the phase with two Majorana fermions, the superconductor can split Cooper pairs efficiently into electrons in two spatially separated leads due to Majorana-induced resonant-crossed Andreev reflections. The resulting currents in the leads are correlated and spin-polarized. Zero bias anomalies have been observed in point contact Andreev reflection spectroscopy using conventional superconductors, and they cannot be suppressed by a highly spin-polarized current. By systematically varying the size of the point contact, the anomalies are found to be evolved from conductance dips outside the superconducting gap.
Spin-Polarized Transport and Andreev Reflection in... - NASA/ADS.
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Zero bias anomaly in Andreev reflection spectroscopy.
Sep 01, 1999 Submitted on 1 Sep 1999 We show that spin-polarized electron transmission across semiconductor/superconductor Sm/S hybrid structures depends sensitively on the degree of spin polarization as well as the strengths of potential and spin-flip scattering at the interface. The use of thin-film C 60 based spin-polarised metallo-molecular interfaces for the creation of spin-triplet superconducting correlations requires that superconducting phase information can be. May 18, 2021 Here we study spin polarization of the vortex core states and spin selective Andreev reflection at the vortex center of the SLTD model. In the topological phase, the differential conductance at the vortex center contributed from the Andreev reflection, is spin selective and has a quantized value d I / d V A t o p o = 2 e 2 / h at zero bias.
PDF Spin Polarization measurements of La MnO LSMO single crystals using.
Spin-polarized transports of relativistic electrons through graphene-based ferromagnet-superconductor double junctions have been investigated theoretically. In the presence of specular Andreev reflection, some unusual properties are found. The oscillating negative magnetoresistance MR is not only observed, but the resonance peak of the MR also appears at a certain bias voltage due to the. One of the challenges facing condensed matter physics nowadays is to understand the electronic structure of high temperature superconductors. This dissertation compiles our contribution to the experimental information concerning this subject. Tunneling conductance spectroscopy a technique capable of probing the electronic density of states in hybrid structures was used to study the current and.
VZLWFKIURPVSLQ VLQJOHWWR Equal-spin Andreev reflection in.
Abstract: We theoretically investigate the quantum transports in a junction between a superconductor and a silicene nanoribbon, under the effect of a magnetic exchange field. We find that for a narrow nanoribbon of silicene, remarkable crossed Andreev reflection with a fraction gt;50#92; can be induced in the energy window of the elastic cotunneling, by destroying some symmetries of the system. The concept of an ABS was first discussed for the case of s-wave superconductors long before the discovery of the d-wave HTSCs.De Gennes amp; Saint-James considered [] the case of multiple Andreev and normal reflections of quasi-particles in a normal layer N of thickness L sandwiched between a superconductor S and an insulator I.Adopting a semiclassical picture, the bound state corresponds.
Probing spin polarization with Andreev reflection: A.
May 09, 2007 More recently, interest has arisen in structures in which the superconductor is in contact with a ferromagnet F. 1 For conventional Andreev reflection into a s-wave superconductor, the two electrons that combine must have opposite spin orientations. In an itinerant ferromagnet in which the conduction electron cloud is spin polarized, not all.. Spin-split superconductors separated by an insulating barrier of arbitrary transparency. At low transparency, the contribution of multiple Andreev reflections leads to a subharmonic gap structure that crucially depends on the amplitude and relative angle of the spin-splitting fields of each.
Determination of spin polarization using an unconventional iron.
We include the effects of spin polarization, interfacial resistance, and Fermi wave-vector mismatch between the F and S regions. Andreev reflection at the F/S interface, governing tunneling at low bias voltage, is strongly modified by these parameters. An unconventional iron superconductor, SmO0.7F0.3FeAs, has been utilized to determine the spin polarization and temperature dependence of a highly spin-polarized material, La0.67Sr0.33MnO3, with.
Spin-polarized transport and Andreev reflection in.
Point-contact andreev reflection ferromagnet superconductor ballistic nanojunctions bulk matrix element bulk material surface magnetization interface parameter co pb interface ferromagnet superconductor ballistic junction critical analysis tight-binding hamiltonians band structure measured differential conductance surface parameter magnetic.
Andreev Reflection in the Fractional Quantum Hall State.
To use this method for measuring spin polarization, the normal metal is replaced with the ferromagnet to be characterized.1,2 Since spin polarized materials have an imbalance of spin up FIG. 1: A N/S junction depicting Andreev reflection. Incident electrons approaching from the left with energies less than the superconducting gap eV 1 lt; .
[PDF] Spin-polarized transport and Andreev reflection in.
Aug 06, 2018 A spin-up electron undergoes Andreev reflection over the length scale of the coherence length inside the superconductor 1, and is reflected as a hole in the spin-down band. The hole is reflected back into the superconductor from the spin-active interface 2, where it picks up a phase shift s /2. An unconventional iron superconductor, SmO 0.7 F 0.3 FeAs, has been utilized to determine the spin polarization and temperature dependence of a highly spin-polarized material, La 0.67 Sr 0.33 MnO 3, with Andreev reflection spectroscopy. The polarization value obtained is the same as that determined using a conventional superconductor Pb but the temperature dependence of the spin polarization. A theoretical study of a three-dimensional 3D normal metal/superconductor interface with arbitrary spin polarization and interface geometry is presented. The interface geometry can drastically affect the Andreev spectrum due to the 3D injection. The 3D effect can be attributed to a larger interfacial scattering factor in the 1D model, yielding the same intrinsic spin polarization and.
Evidence for Crossed Andreev Reflections in 100YBasub 2Cu.
The European Physical Society EPS is a not for profit association whose members include 41 National Physical Societies in Europe, individuals from all fields of physics, and Eur. The control and manipulation of spins in graphene may lead to a number of novel applications and to the design of new devices, such as spin-based memories 217 or spin logic chips. 218 Graphene is uniquely suitable for such applications, since it does not show sizeable spinorbit coupling, 74 and is almost free of nuclear magnetic moments. 219.
Magnetoanisotropic Andreev Reflection in Ferromagnet-Superconductor.
We report a theoretical investigation of the spin-polarized transport of relativistic electrons through a three-terminal graphene-based superconductor bipolar transistor with ferromagnetic leads. It is found that the magnetoresistance in such a system can be improved largely in comparison with that in the corresponding two-terminal structure due to the existence of the special crossed Andreev. The interface gives rise to an effective momentum- and spin-dependent scattering potential, making the probability of AR strongly asymmetric with respect to the sign of the incident electrons transverse momenta. This skew AR creates spatial charge carrier imbalances and transverse Hall currents flow in the ferromagnet.
Nonlocal transistor based on pure crossed Andreev reflection in a EuO.
Andreev reflection AR at the interface between a superconductor and a ferromagnet has been attracting significant interest e.g., Refs. 15 as the foundation of a new technique 1 to measure the spin polarization in ferromagnets. A superconducting point contact is used to determine the spin polarization at the Fermi energy of several metals. Because the process of supercurrent conversion at a superconductor-metal interface Andreev reflection is limited by the minority spin population near the Fermi surface, the differential conductance of the point contact can reveal.
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