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- W3103946475 abstract "We consider a charged particle driven by a time-dependent flux threading a quantum ring. The dynamics of the charged particle is investigated using a classical treatment, a Fourier expansion technique, a time-evolution method, and the Lewis-Riesenfeld approach. We have shown that, by properly managing the boundary conditions, a time-dependent wavefunction can be obtained using a general non-Hermitian time-dependent invariant, which is a specific linear combination of initial angular-momentum and azimuthal-angle operators. It is shown that the linear invariant eigenfunction can be realized as a Gaussian-type wavepacket with a peak moving along the classical angular trajectory, while the distribution of the wavepacket is determined by the ratio of the coefficient of the initial angle to that of the initial canonical angular momentum. From the topologically nontrivial nature as well as the classical trajectory and angular momentum, one can determine the dynamical motion of the wavepacket. It should be noted that the peak position is no longer an expectation value of the angle operator, and hence the Ehrenfest theorem is not directly applicable in such a topologically nontrivial system." @default.
- W3103946475 created "2020-11-23" @default.
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- W3103946475 date "2007-04-10" @default.
- W3103946475 modified "2023-09-24" @default.
- W3103946475 title "Charged particle motion in a time-dependent flux-driven ring: an exactly solvable model" @default.
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- W3103946475 doi "https://doi.org/10.1088/0953-8984/19/17/176224" @default.
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