Search results for "Zener effect"

showing 3 items of 3 documents

Many-body Landau-Zener effect at fast sweep

2005

The asymptotic staying probability P in the Landau-Zener effect with interaction is analytically investigated at fast sweep, epsilon = pi Delta^2/(2 hbar v) << 1. We have rigorously calculated the value of I_0 in the expansion P =~ 1 - epsilon + epsilon^2/2 + epsilon^2 I_0 for arbitrary couplings and relative resonance shifts of individual tunneling particles. The results essentially differ from those of the mean-field approximation. It is shown that strong long-range interactions such as dipole-dipole interaction (DDI) generate huge values of I_0 because flip of one particle strongly influences many others. However, in the presence of strong static disorder making resonance for indiv…

PhysicsCondensed Matter - Materials ScienceStatistical Mechanics (cond-mat.stat-mech)Zener effectSpinsCondensed matter physicsMany-body theoryMaterials Science (cond-mat.mtrl-sci)FOS: Physical sciencesResonanceCondensed Matter PhysicsElectronic Optical and Magnetic MaterialsCrystalTunnel effectMean field theoryPerturbation theoryCondensed Matter - Statistical MechanicsPhysical Review B
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Inverse problem for the Landau-Zener effect

2002

We consider the inverse Landau-Zener problem which consists in finding the energy-sweep functions W(t)=E1(t)-E2(t) resulting in the required time dependences of the level populations for a two-level system crossing the resonance one or more times during the sweep. We find sweep functions of particular forms that let manipulate the system in a required way, including complete switching from the state 1 to the state 2 and preparing the system at the exact ground and excited states at resonance.

PhysicsCondensed Matter - Mesoscale and Nanoscale PhysicsZener effectStatistical Mechanics (cond-mat.stat-mech)General Physics and AstronomyInverseFOS: Physical sciencesState (functional analysis)Inverse problemResonance (particle physics)Excited stateQuantum mechanicsMesoscale and Nanoscale Physics (cond-mat.mes-hall)Condensed Matter - Statistical Mechanics
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Dzyaloshinskii-Moriya and dipole-dipole interactions affect coupling-based Landau-Majorana-Stückelberg-Zener transitions

2020

It has been theoretically demonstrated that two spins (qubits or qutrits), coupled by exchange interaction only, undergo a coupling-based joint Landau-Majorana-St\"uckelberg-Zener (LMSZ) transition when a linear ramp acts upon one of the two spins. Such a transition, under appropriate conditions on the parameters, drives the two-spin system toward a maximally entangled state. In this paper, effects on the quantum dynamics of the two qudits, stemming from the Dzyaloshinskii-Moriya (DM) and dipole-dipole (d-d) interactions, are investigated qualitatively and quantitatively. The enriched Hamiltonian model of the two spins, shares with the previous microscopic one the same C2-symmetry which onc…

PhysicsQuantum PhysicsCondensed matter physicsSpin dynamicsQuantum entanglementCondensed Matter::Mesoscopic Systems and Quantum Hall Effect01 natural sciencesPhysics::History of Physics010305 fluids & plasmasCoupling (physics)MAJORANADipole0103 physical sciencesCondensed Matter::Strongly Correlated ElectronsPhysics::Atomic PhysicsZener diode010306 general physicsDipolar interaction Dzyaloshinskii-Moriya interaction Entanglement production Landau-Zener effect Quantum entanglement Spin dynamicsPhysical Review Research
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