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We study the influence of many-body interactions on the transport characteristics of a pair of quantum wires that are coupled to each other by means of a quantum dot. Under conditions where a local magnetic moment is formed in one of the wires, tunnel coupling to the other gives rise to an associated peak in its density of states, which can be detected directly in a conductance measurement. Our theory is therefore able to account for the key observations in the recent study of T. Morimoto et al. [Appl. Phys. Lett., ()]], and demonstrates that coupled quantum wires may be used as a system for the detection of local magnetic-moment formation. 相似文献
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Yoon Y Mourokh L Morimoto T Aoki N Ochiai Y Reno JL Bird JP 《Physical review letters》2007,99(13):136805
Using an approach that allows us to probe the electronic structure of strongly pinched-off quantum point contacts (QPCs), we provide evidence for the formation of self-consistently realized bound states (BSs) in these structures. Our approach exploits the resonant interaction between closely coupled QPCs, and demonstrates that the BSs may give rise to a robust confinement of single spins, which show clear Zeeman splitting in a magnetic field. 相似文献
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一、TheProblem .Letf(x) =ax2 bx c ax2 px q,wherea >0 ,b2 - 4ac≤ 0andp2 - 4aq≤ 0 .OurProblemis“Whetherdoesminx∈Rf(x)exis?Moreover ,,ifminx∈Rf(x)exists,thenminx∈Rf(x)=?andinthiscasex =?” .Naturally ,weknowthatminx∈Rf(x)existsfromtheknowledgeofmathematicalanalysis.Also,wecangivethe… 相似文献
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The synthesis and characterization of new metal-free (9) and metal-containing (Zn, Ni or Cu 10, 11, 12) derivatives of a symmetrically octasubstituted phthalocyanine derived from 21,22-dicyano-2,3,5,6,8,9,11,12,15,17,18,25,26,28-tetradecahydro[1,4,7,12] benzodioxadithiacyclotetradeceno[6,7-b][1,4,7,10,13]benzopentaoxacyclopentadecene (7), which was synthesized in a multi-step reaction sequence, have been described. The novel compouds have been characterized by a combination of elemental analysis, 1H and 13C NMR, IR, UV–vis and MS spectral data. 相似文献
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