948 resultados para Magnetic field
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Work performed at Los Alamos Scientific Laboratory.
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"402-R-92-008."
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"ORINS-40; Particle accelerators and high-voltage machines."
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"Prepared for the Air Force Ballistic Missile Division, Headquarters Air Research and Development Command, under contract AF 04(647)-309 advanced propulsion systems."
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At head of title: PRL-9-23.
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"Prepared for the Air Force Ballistic Missile Division, Headquarters Air Research and Development Command, under contract AF04(647)-127, call no. 4."
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"February 1965."
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"AEC Contract AT(04-3)-400."
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"Contract N-onr-401-15."
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"AFOSR-1525."
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Mode of access: Internet.
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"This research was supported by the McDonnell Aircraft Corporation under Contract no.6140-20 P.O.7S4899-R."
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Spin precession due to Rashba spin-orbit coupling in a two-dimension electron gas is the basis for the spin field effect transistor, in which the overall perfect spin-polarized current modulation could be acquired. There is a prerequisite, however, that a strong transverse confinement potential should be imposed on the electron gas or the width of the confined quantum well must be narrow. We propose relieving this rather strict limitation by applying an external magnetic field perpendicular to the plane of the electron gas because the effect of the magnetic field on the conductance of the system is equivalent to the enhancement of the lateral confining potential. Our results show that the applied magnetic field has little effect on the spin precession length or period although in this case Rashba spin-orbit coupling could lead to a Zeeman-type spin splitting of the energy band.
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We consider the semilinear Schrodinger equation -Delta(A)u + V(x)u = Q(x)vertical bar u vertical bar(2* -2) u. Assuming that V changes sign, we establish the existence of a solution u not equal 0 in the Sobolev space H-A,V(1) + (R-N). The solution is obtained by a min-max type argument based on a topological linking. We also establish certain regularity properties of solutions for a rather general class of equations involving the operator -Delta(A).