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Showing 1 to 20 of 46 for “"Exchange Interaction"”.
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Tunable Exchange Interaction in Coupled Quantum Dots
Exchange energies and charge densities for few electrons in electrically tunable quantum dot (QD) systems are investigated by using the variational Monte Carlo (VMC) method in the presence of magnetic fields. For N = 2 electrons in double QD, the singlet Coulomb energy decreases in magnetic fields …
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Engineering Exchange Interaction in Coupled Spin-Qubit Quantum Dots
Made available in DSpace on 2015-09-25T20:09:36Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 3337987.pdf: 1801101 bytes, checksum: 570011a5dce77a7cb4211a43262e750e (MD5) Previous issue date: 2008
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Magnetism on the timescale of the exchange interaction : explanations and predictions
Contains fulltext : 98631.pdf (Publisher’s version ) (Open Access)
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Active control of superconductivity by means of the ferromagnetic exchange interaction
… be modulated by controlling the ferromagnetic exchange interaction in the superconductor. The exchange interaction in the superconductor is the sum of the exchange interaction from the ferromagnetic regions, which has a phase and magnitude that depends upon the direction that the ferromagnet is …
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Optical properties of gallium arsenide and indium gallium arsenide quantum wells and their applications to optoelectronic devices
… consider phase space filling, screening, and exchange interaction showed the phase space filling to be the dominant mechanism responsible for the change of oscillator strength and binding energy of excitons associated with partially filled subband. On the other hand, the screening and exchange …
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Element-resolved ultrafast magnetization dynamics in ferromagnetic alloys and multilayers
… to decoupled dynamics, despite the strong exchange interaction that couples the Ni and Fe sublattices under equilibrium conditions. Furthermore, the time constants of demagnetization for Ni and Fe are different in Ni50Fe50 and Ni80Fe20, and also different from the values for the respective …
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Universal properties of low-temperature glass
… universal properties. Based on virtual phonon exchange interaction, we develop a glass generic coupled block model to discuss two universal properties: sound velocity/dielectric constant shift, and low-temperature mechanical avalanche problem. We also successfully explain the universal property …
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Zero field NMR study on a spin glass: Iron-doped 2H-niobium diselenide
… model, which utilizes the anisotropy of the exchange interaction, to overcome this difficulty. All of our NQR results and the model calculation of the correlation times of Fe spins are best described by the phase transit ion picture of spin glasses.
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Zero Field Nmr Study on a Spin Glass: Iron-Doped 2hydrogen-Niobium Diselenide
… model, which utilizes the anisotropy of the exchange interaction, to overcome this difficulty. All of our NQR results and the model calculation of the correlation times of Fe spins are best described by the phase transition picture of spin glasses.
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Magnetic properties of R2PdSi3 (R = heavy rare earth) compounds
… properties. Thus the established framework of exchange interaction and magneto-crystalline anisotropy allows a collective description instead of a “novel” behavior.
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Marketing's integration with other departments
… distinguished integration as a composite of interaction and collaboration. Incorporating contingency and sociotechnical theories, two main research propositions were developed and served as the foundation for the proposed model: 1) an individual department's attributes will influence its …
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Synthesis, structure, and magnetic properties of extended 2-D triangular lattices
… developed from the Dzyaloshinsky-Moriya (DM) interaction. Although the DM interaction energy is only 1.2 cm⁻¹, this is large enough to give rise to a 3-D magnetic structure, precluding the ability to study the ground state physics of a purely 2-D frustrated spin system. Copper hydroxy-bridged …
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High pressure Mössbauer studies of magnetic interactions in palladium-cobalt alloys
… the pd host, it is concluded that a direct Co-Co exchange interaction which is not prominent in the very dilute cases becomes important at concentrations somewhere between 4% and 8% Co in Pd. Isomer shift data are also obtained and show a composition independent pressure dependence which is …
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Developing spectroscopic ellipsometry to study II-VI and diluted magnetic semiconductors
… decrease with x for Zn1_xMnxSe. A sp-d direct exchange interaction model which explained the r-point band gap energy of Zn1_xMnxSe was applied. The calculated band gap energies at the Lpoint are only consistent with Zn1_xMnxSe data. We showed that an sp-d hybridization model, which includes the …
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Topological Insulators Interfaced with Trivial and Ferromagnetic Insulators. Selective contact and patterning of surface states.
… gap at the Dirac point due to the magnetic exchange interaction. Selective etching of these heterostructures allows us to probe regions of TI/FI and regions of TI and compare them through transport measurements. The results in this thesis provide a foundation for the fabrication of …
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Exploring valleytronics in 2D transition metal dichalcogenides
… shows the characteristics of an electron-hole exchange interaction rather than nonradiative scattering. These results offer the initial groundwork for future devices that use the coupled valley-spin degree of freedom as a robust token of information, promising reduced power consumption compared …
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Interfacial Magnetism and Exchange Bias in Metal Oxide Thin Films
… bilayers, and the results show an enhancement of exchange bias and coercivity after the implantation. Polarized neutron reflectometry study reveals a significant change in magnetic spin reversal mechanism due to chemical modification. In the La0.7Ca0.3MnO3/CaMnO3 system exchange bias is assisted …
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Core excitons in amorphous magnesium alloys
… involved. This effect is caused by electron-hole exchange interaction, which suggests a compact exciton wave function. Furthermore, for sufficiently long screening lengths the excitons sharpened enough to uncover additional structure, possibly due to higher order members of an exciton series. The …
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Moving Targets: Meanings of Mobility in Metropolitan Nairobi
… of transportation, they became crucial spaces of exchange, interaction, production and consumption that seemed to perpetually exist just out of the reach of the state. The ability to stay on the edges of state control was an important part of providing mobility for people in a colonial city, …
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Application Of Scanning Hall Probe Microscopy For High Throughput Characterization Of Combinatorial Magnetic Materials
… We have also studied the Dzyaloshinskii-Moriya exchange interaction ferromagnet MnSi and investigated its magnetic structure, as it undergoes paramagnetic-helical, helical-conical and conical-ferromagnetic phase transitions.</p>
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