Electron Spin Catalysis

Бучаченко, А. Л.; Berdinsky, Vitaly L.

doi:10.1021/cr010370l

Cited by 143 publications

(172 citation statements)

References 40 publications

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“…The eight spin states can be classified by both overall multiplicity and multiplicity of the rightmost spin pair, and comprise a quadruplet, |Q Sz , and two doublets, |D Sz and |D Sz , where S z denotes the z-component of total spin and takes values S z = ±1/2 or ±3/2 for the quadruplet and S z = ±1/2 for the doublets ( Fig. 2(b)) 12,19,20 . Whereas for |D Sz states, the rightmost pair of spins forms a singlet, for |D Sz states, the rightmost pair forms a mixture of triplet states (see Appendix B).…”

Section: A the Qubit Subspacementioning

confidence: 99%

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Coherent spin manipulation in an exchange-only qubit

Laird¹,

Taylor²,

DiVincenzo³

et al. 2010

Phys. Rev. B

238

304

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Initialization, manipulation, and measurement of a three-spin qubit are demonstrated using a few-electron triple quantum dot, where all operations can be driven by tuning the nearest-neighbor exchange interaction. Multiplexed reflectometry, applied to two nearby charge sensors, allows for qubit readout. Decoherence is found to be consistent with predictions based on gate voltage noise with a uniform power spectrum. The theory of the exchange-only qubit is developed and it is shown that initialization of only two spins suffices for operation. Requirements for full multi-qubit control using only exchange and electrostatic interactions are outlined.Comment: related work at http://marcuslab.harvard.ed

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Section: A the Qubit Subspacementioning

confidence: 99%

“…1(a), coupled by nearest-neighbour exchange and subject to a magnetic field. The Hamiltonian is 12 :…”

Section: Coherent Spin Manipulationmentioning

confidence: 99%

Coherent spin manipulation in an exchange-only qubit

Laird¹,

Taylor²,

DiVincenzo³

et al. 2010

Phys. Rev. B

238

304

View full text Add to dashboard Cite

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“…The Woodward-Hoffman Rule determines that the broken carbon bonds would preserve their symmetry and undergo related faster kinetic of re-graphitizing by symmetrically compatible and already existing sp 2 orbitals to reform the graphitic precursor rather than the slower pathways of rehybridization for bond rearrangement for forming different sp 3 orbitals of different symmetry for diamond formation. But, here the Resolution demonstrates a high spin asymmetric bottleneck for radical carbon, ferrometal and hydrogen radicals by the intrinsic magnetism and the enhancement by external magnetization for disrupting orbital symmetry during bond rearrangement, thereby preventing graphitization, enhancing transformation of graphitic sp 2 carbon to sp 3 carbon, and substantially lowering the sp 3 bosonic bonding interactions between carbon atoms so the sp 3 carbon atoms can accumulate and densify for greater probability of bulk (macro) high spin sp 3 [39,40] on photochemistry [41,42], on radical recombination [43,44], on spin chemistry [45], on spin catalysis [46,47] and on spin isotope effects [48]. The Little Effect is distinct from these prior spin phenomena.…”

Section: The Resolution Of the Diamond Problemmentioning

confidence: 99%

Treatise on the Resolution of the diamond problem after 200 years

Little

Roache

2008

Progress in Solid State Chemistry

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Abstract:The problem of the physicochemical synthesis of diamond spans more than 200 years, involving many giants of science. Many technologies have been discovered, realized and used to resolve this diamond problem. Here the origin, definition and cause of the diamond problem are presented. The Resolution of the diamond problem is then discussed on the basis of the Little Effect, involving novel roton-phonon driven (antisymmetrical) multi-spin induced orbital orientation, subshell rehybridization and valence shell rotation of radical complexes in quantum fluids under magnetization across thermal, pressure, compositional, and spinor gradients in both space and time. Some experimental evidence of this magnetic quantum Resolution is briefly reviewed and integrated with this recent fruitful discovery. Furthermore, the implications of the Little Effect in comparison to the Woodward-Hoffman Rule are considered. The distinction of the Little Effect from the prior radical pair effect is clarified. The better compatibility of radicals, dangling bonds and magnetism with the diamond lattice relative to the graphitic lattice is discussed. Finally, these novel physicochemical phenomena for the Little Effect are compared with the natural diamond genesis. * corresponding author; email : redge_little@yahoo.com Keywords: diamond, high pressure, plasma deposition, catalytic properties, magnetic properties. Introduction -The Diamond Problem:A long history of giants of science has defined and contributed to the solution of the diamond problem. Section 2 considers the cause of the diamond problem. The list includes Newton, Boyle, Lavoisier, Guillton, Clouet, Karazin, Despretz, Hannay, Moisson, Roozeboom, Jessup, Rossini, Tammann, Parson, Einstein, Leipunski, Bridgman, Berman, Simon, Hershey, von Platen, Lundblad, Hall, Bundy, Strong, Wentorf, Cannon, Eversole, Deryagin, Angus, Fedoseev, Setaka, Matsumoto, Yugo, Linarres, Hemley, Sumiya, and Little. On the basis of these investigators, many technologies have been considered for resolving the diamond problem. These technologies include electric arcs; metal solvents; metal catalysts; electric ovens; electric resistive heaters; anvil vices and presses; electron beams; atomic beams; x-rays, alpha, and beta irradiators; exploding media; rapid lasing and liquid nitrogen quencher; chemical vapor deposition (CVD); hydrogenous plasma and microwave apparatuses; hot filaments; flames; and recently strong magnets. Some of these technologies have resulted in partial successes by the direct method, the indirect method and the H plasma metastable method of forming diamond. The complete Resolution here considers all three of these methods along with natural diamond formation and demonstrates complete Resolution by external magnetization (using external magnetization in conjunction with these three methods and considering intrinsic magnetism in mantle Kimberlite).On this basis, the synthesis and understanding of diamond have developed along side developments in chemistry, physics and engineering dur...

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“…TM clusterization on graphene, which is actually a subject of spin-catalytic effect (see, for example ref. 29). This effect is caused by the spin conversion of the reagents in the presence of the spin catalyst with uncompensated spin; two main examples of such phenomenon are the photolysis of diphenylpentanone and the recombination of triplet pair of two benzyl radicals during photolysis of dibenzylketone after decarbolination of the initial pair.…”

Section: Introductionmentioning

confidence: 99%

Prospects of Spin Catalysis on Spin-Polarized Graphene Heterostructures

et al. 2016

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Extreme points on potential energy surfaces of Ni adatom on free-standing graphene and top:fcc and hcp:fcc graphene/ Ni(111) heterostructures in different spin states were studied using periodic boundary conditions density functional theory approach. It was found that the spin states of the substrates strongly influence the energy of the Ni adatom extreme points on potential energy surface by decreasing (top:fcc heterostructure) or increasing (hcp:fcc heterostructure) the total energies of Z 1 , Z 1 0 , and Z 2 Ni adatom coordinations on graphene. This phenomenon offers unique possibilities to control the potential energy surfaces of transition metal adatoms and promote surface chemical reactions using induced spin polarization of graphene substrates.

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Electron Spin Catalysis

Cited by 143 publications

References 40 publications

Coherent spin manipulation in an exchange-only qubit

Coherent spin manipulation in an exchange-only qubit

Treatise on the Resolution of the diamond problem after 200 years

Prospects of Spin Catalysis on Spin-Polarized Graphene Heterostructures

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