Andreev Reflection In Spin Polarised Superconductor

07.26.2022

Spin Current in Ferromagnet-insulator-superconductor Junctions.
Spin polarized transport as measured by superconducting Andreev.
Spiral: Andreev bound states in superconductor/ferromagnet point.
Resonant Andreev reflection in a FIDI'D' system where F is spin.
Equal-spin and oblique-spin crossed Andreev reflections in ferromagnet.
Reprint of Elementary Andreev Processes in a Driven Superconductor.
Tunable spin-dependent Andreev reflection in a four... - SpringerOpen.
Skew Andreev reflection in ferromagnet/superconductor junctions.
Crossed Andreev reflection in graphene-based ferromagnet-superconductor.
Andreev bound states in normal and ferromagnet/high-Tc superconducting.
Spin-polarized quasiparticle transport in ferromagnet/insulator/p-wave.
PDF Spin-polarized transport in ferromagnetic semiconductor / diffusive.
Andreev reflection and pair-breaking effects at the superconductor.
PDF Magnetoanisotropic Andreev Reflection in Ferromagnet-Superconductor.

Spin Current in Ferromagnet-insulator-superconductor Junctions.

We find crossed Andreev reflection (CAR) across the superconductor separating two qH edges. In integer fillings, we find a filling-independent CAR probability robust to changes in magnetic field and temperature, which we attribute to spin-orbit coupling in NbN allowing for Andreev reflection between spin-polarized edges. The current I resulting from the necessity to match spin-polarised current in the ferro-magnet with spin-lesscurrent in the superconductor. We calculate I using the tunnelling Hamiltonian method and the nonequilibrium (Keldysh) Green functions technique. It is shown that the inelastic magnon-assisted Andreev process would manifest itself as a.

Spin polarized transport as measured by superconducting Andreev.

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.

Spiral: Andreev bound states in superconductor/ferromagnet point.

INVESTIGATIONS OF CROSSED ANDREEV REFLECTION IN HYBRID SUPERCONDUCTOR-FERROMAGNET STRUCTURES BY MADALINA COLCI O'HARA Dipl. de Lie, University of Bucharest, 2000... 2.2.1 Spin Polarized Transport into a Nonmagnetic Metal 7 2.2.2 Magnetoresistance 14 2.2.3 Anisotropic Magnetoresistance 15. The process is highly spin-dependent - if only one spin band is occupied by the conduction electrons in the normal-state material (i.e. it is fully spin-polarized), Andreev reflection will be inhibited due to inability to form a pair in the superconductor and impossibility of single-particle transmission. In a ferromagnet or material where.

Resonant Andreev reflection in a FIDI'D' system where F is spin.

Resonant Andreev reflection in a FIDI'D' system where F is spin-polarized and DI'D' is a D-wave superconductor containing a grain boundary. Master's thesis, Texas A&M University. Available electronically from / /hdl /1969.1 /ETD -TAMU -2000 -THESIS -W265. Request Open Access This item and its contents are restricted. Nonlocal currents, in devices where two normal metal terminals are contacted to a superconductor, are determined using the circuit theory of mesoscopic superconductivity. We calculate the conductance associated with crossed Andreev reflection and electron. AppliedPhysicsA(2007)manuscriptNo.(willbeinsertedbytheeditor) a. rX. i. v:07. 09.40. 20v1.

Equal-spin and oblique-spin crossed Andreev reflections in ferromagnet.

The Oxford Handbook of Small Superconductors, Oxford Handbooks (2017; online edn, Oxford Academic, 6 July 2017... Andreev quantum bits 469. Andreev reflection 25, 144-178, 469, 473. basic aspects 144-149. BTK model 152-155.... conventional spin electronics (spintronics) 415, 416. conventional superconductivity 418. Opposite spin electron to be removed from the N region for conversion to Cooper pair. In case of S-F junctions, Andreev reflection is limited by the minority spin population. Our experimental results can be qualitatively understood by considering the suppression of Andreev reflection due to spin polarization in p-In 0.96 Mn 0.04 As. We further study the effects of spin polarization, inelastic scattering, and interfacial scattering on the Andreev reflection, normal reflection, and transmitted probabilities in equilibrium as well as under a bias.

Reprint of Elementary Andreev Processes in a Driven Superconductor.

Here, spin-polarized scanning... superconductor of the Bi2Te3=NbSe2 heterostructure. The zero-bias peak of the tunneling differential... [16], where the Andreev reflection (AR) is spin selective. They showed that MZM induces selective equal spin AR, in which incoming electrons with certain spin polarization in the lead are. Superconductivity Correction: Journal of Applied Physics 90, 3127 (2001) ABSTRACT Andreev reflection at the interface between a ferromagnet and a superconductor has become a foundation of a versatile technique of measuring the spin polarization of magnetic materials.

Tunable spin-dependent Andreev reflection in a four... - SpringerOpen.

Andreev reflection ( AR ), named after the Russian physicist Alexander F. Andreev, is a type of particle scattering which occurs at interfaces between a superconductor (S) and a normal state material (N). It is a charge-transfer process by which normal current in N is converted to supercurrent in S. A critical analysis of point-contact Andreev reflection (PCAR) in ferromagnet/superconductor ballistic junctions is presented, based on tight-binding Hamiltonians.

Skew Andreev reflection in ferromagnet/superconductor junctions.

Abstract We present a theory of Andreev reflection in a ferromagnet/superconductor/ferromagnet double junction system. In the Andreev reflection process, the injected spin polarized quasiparticles convert into Cooper pairs in the superconductor within the range of the penetration depth from the interface. One of the most interesting effects in this environment is spin-polarized Andreev reflection. Andreev reflection at a boundary between a conventional superconductor and a ferromagnet is well. A theory of spin polarized tunneling spectroscopy based on a scattering theory is given for tunneling junctions between ferromagnets and d-wave superconductors. The spin filtering effect of an exchange field in the insulator is also treated. We clarify that the properties of the Andreev reflection are largely modified due to a presence of an exchange field in the ferromagnets, and consequently.

Crossed Andreev reflection in graphene-based ferromagnet-superconductor.

CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): Andreev reflection at the interface between a ferromagnet and a superconductor has become a foundation of a versatile new technique of measuring the spin polarization of magnetic materials. In this paper we will briefly outline a general theory of Andreev reflection for spin-polarized systems and arbitrary Fermi.

Andreev bound states in normal and ferromagnet/high-Tc superconducting.

We investigate the applicability of spin-polarization measurements using Andreev reﬂection in a point- contact geometry in heavily doped dilute magnetic semiconductors, such as Ga,Mn As. Although we observe conventional Andreev reﬂection in nonmagnetic Ga,Be As epilayers, our measurements indicate that in fer.

Spin-polarized quasiparticle transport in ferromagnet/insulator/p-wave.

Superconductor (N/TS) junction, electrons with opposite spin polarization −n⃗ are completely decoupled from the MF and they cannot participate in Andreev reflections [Fig. 1(b)]. In other words, the MF selects electrons with certain spin polarization n⃗ to undergo equal-spin Andreev reflections. Therefore, we refer to this new phenomenon as. We show that spin-polarized electron transmission across semiconductor/superconductor (Sm/S) hybrid structures depends sensitively on the degree of spin polarization.

PDF Spin-polarized transport in ferromagnetic semiconductor / diffusive.

Andreev reflection is a smart tool to investigate the spin polarization P of the current through point contacts between a superconductor and a ferromagnet. We compare different models to extract P from experimental data and investigate the dependence of P on different contact parameters. PACS: 72.25.Ba Spin polarized transport in metals. Ag/BSCCO and Fe/Ag/BSCCO planar tunnel junctions were constructed in order to study experimentally the effect of an exchange potential on the spin polarized current transported through Andreev bound states appearing at the interface with a superconductor with broken time reversal pairing symmetry.

Andreev reflection and pair-breaking effects at the superconductor.

Point-contact Andreev-reflection spectroscopy (PCARS) is one of the most direct techniques to study the number, amplitude, and symmetry (in the k space) of the energy gap(s) in superconductors. In the past 15 years, it has turned out to be a powerful and versatile alternative to more demanding and expensive techniques, for example scanning tunnel spectroscopy, for the study of unconventional.

PDF Magnetoanisotropic Andreev Reflection in Ferromagnet-Superconductor.

Physica E: Low-dimensional Systems and Nanostructures. Volume 82, August 2016, Pages 222-228, August 2016, Pages 222-228. Spin-polarized Currents for Spintronic Devices: Point-contact Andreev Reflection and Spin Filters. Sebastian von Oehsen.... spin transistor spin-dependent spin-down electrons spin-orbit interaction spin-up and spin-down spintronic split gates subbands superconductor technique temperature theoretical thickness thin ﬁlms transport tunneling.