Ferromagnetically Coupled Cobalt−Benzene−Cobalt: The Smallest Molecular Spin Filter with Unprecedented Spin Injection Coefficient

2010 ◽  
Vol 132 (43) ◽  
pp. 15334-15339 ◽  
Author(s):  
Sabyasachi Sen ◽  
Swapan Chakrabarti
Keyword(s):  
Spin Injection ◽  
Spin Filter ◽  
Injection Coefficient ◽  
Molecular Spin

The molecular spin filter constructed from 1D organic chain

2014 ◽  
Vol 378 (30-31) ◽  
pp. 2020-2023 ◽  
Author(s):  
Wei Chen ◽  
Ning Xu ◽  
Baolin Wang ◽  
Baoan Bian
Keyword(s):  
Spin Filter ◽  
Molecular Spin

SPIN INTERFERENCE IN RASHBA 2DEG SYSTEMS

2008 ◽  
Vol 22 (01n02) ◽  
pp. 108-108
Author(s):  
JUNSAKU NITTA
Keyword(s):  
Gate Voltage ◽  
Second Harmonic ◽  
Spin Injection ◽  
Hybrid Structure ◽  
Specific Conductance ◽  
Spin Precession ◽  
Spatial Gradient ◽  
Spin Filter ◽  
Precession Angle ◽  
Conductance Fluctuations

The gate controllable SOI provides useful information about spin interference.1 Spin interference effects are studied in two different interference loop structures. It is known that sample specific conductance fluctuations affect the conductance in the interference loop. By using array of many interference loops, we carefully pick up TRS Altshuler-Aronov-Spivak (AAS)-type oscillation which is not sample specific and depends on the spin phase. The experimentally obtained gate voltage dependence of AAS oscillations indicates that the spin precession angle can be controlled by the gate voltage.2 We demonstrate the time reversal Aharonov-Casher (AC) effect in small arrays of mesoscopic rings.3 By using an electrostatic gate we can control the spin precession angle rate and follow the AC phase over several interference periods. We also see the second harmonic of the AC interference, oscillating with half the period. The spin interference is still visible after more than 20π precession angle. We have proposed a Stern-Gerlach type spin filter based on the Rashba SOI.4 A spatial gradient of effective magnetic field due to the nonuniform SOI separates spin up and down electrons. This spin filter works even without any external magnetic fields and ferromagnetic contacts. We show the semiconductor/ferromagnet hybrid structure is an effective way to detect magnetization process of submicron magnets. The problem of the spin injection from ferromagnetic contact into 2DEG is also disicussed. Note from Publisher: This article contains the abstract only.

Enhancing spin injection efficiency through half-metallic miniband conduction in a spin-filter superlattice

2016 ◽  
Vol 28 (5) ◽  
pp. 056003 ◽  
Author(s):  
Yi-Hang Yang ◽  
Lin Li ◽  
Fen Liu ◽  
Zhi-Wei Gao ◽  
Guo-Xing Miao
Keyword(s):  
Spin Injection ◽  
Spin Filter ◽  
Injection Efficiency ◽  
Half Metallic

Molecular spin valve and spin filter composed of single-molecule magnets

2010 ◽  
Vol 96 (8) ◽  
pp. 082115 ◽  
Author(s):  
L. Zhu ◽  
K. L. Yao ◽  
Z. L. Liu
Keyword(s):  
Single Molecule ◽  
Spin Valve ◽  
Spin Filter ◽  
Single Molecule Magnets ◽  
Molecular Spin

Efficient spin injection into GaAs quantum well across Fe3O4 spin filter

2010 ◽  
Vol 96 (10) ◽  
pp. 102510 ◽  
Author(s):  
E. Wada ◽  
K. Watanabe ◽  
Y. Shirahata ◽  
M. Itoh ◽  
M. Yamaguchi ◽  
...  
Keyword(s):  
Quantum Well ◽  
Spin Injection ◽  
Spin Filter

Engineering Electronic Structure to Protect Phase Memory in Molecular Qubits by Minimising Orbital Angular Momentum

2018 ◽  
Author(s):  
Ana Maria Ariciu ◽  
David H. Woen ◽  
Daniel N. Huh ◽  
Lydia Nodaraki ◽  
Andreas Kostopoulos ◽  
...  
Keyword(s):  
Electron Spin ◽  
Quantum Coherence ◽  
Quantum Information Processing ◽  
Pulse Sequences ◽  
Grover Algorithm ◽  
Ligand Shell ◽  
Information Strategies ◽  
Spin Qubit ◽  
Molecular Spin ◽  
The Impact

Using electron spins within molecules for quantum information processing (QIP) was first proposed by Leuenberger and Loss (1), who showed how the Grover algorithm could be mapped onto a Mn12 cage (2). Since then several groups have examined two-level (S = ½) molecular spin systems as possible qubits (3-12). There has also been a report of the implementation of the Grover algorithm in a four-level molecular qudit (13). A major challenge is to protect the spin qubit from noise that causes loss of phase information; strategies to minimize the impact of noise on qubits can be categorized as corrective, reductive, or protective. Corrective approaches allow noise and correct for its impact on the qubit using advanced microwave pulse sequences (3). Reductive approaches reduce the noise by minimising the number of nearby nuclear spins (7-11), and increasing the rigidity of molecules to minimise the effect of vibrations (which can cause a fluctuating magnetic field via spin-orbit coupling) (9,11); this is essentially engineering the ligand shell surrounding the electron spin. A protective approach would seek to make the qubit less sensitive to noise: an example of the protective approach is the use of clock transitions to render spin states immune to magnetic fields at first order (12). Here we present a further protective method that would complement reductive and corrective approaches to enhancing quantum coherence in molecular qubits. The target is a molecular spin qubit with an effective 2S ground state: we achieve this with a family of divalent rare-earth molecules that have negligible magnetic anisotropy such that the isotropic nature of the electron spin renders the qubit markedly less sensitive to magnetic noise, allowing coherent spin manipulations even at room temperature. If combined with the other strategies, we believe this could lead to molecular qubits with substantial advantages over competing qubit proposals.<br>

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