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- W2042797554 abstract "We present results of a detailed quantum-mechanical study of a gas of N noninteracting electrons confined to a circular boundary and subject to homogeneous dc plus ac magnetic fields [B=B(dc)+B(ac)f(t), with f(t+2pi/omega(0))=f(t)]. We earlier found a one-particle classical phase diagram of the (scaled) Larmor frequency omega;(c)=omega(c)/omega(0) vs epsilon=B(ac)/B(dc) that separates regular from chaotic regimes. We also showed that the quantum spectrum statistics changed from Poisson to Gaussian orthogonal ensembles in the transition from classically integrable to chaotic dynamics. Here we find that, as a function of N and (epsilon,omega(c)), there are clear quantum signatures in the magnetic response, when going from the single-particle classically regular to chaotic regimes. In the quasi-integrable regime the magnetization nonmonotonically oscillates between diamagnetic and paramagnetic as a function of N. We quantitatively understand this behavior from a perturbation theory analysis. In the chaotic regime, however, we find that the magnetization oscillates as a function of N but it is always diamagnetic. Equivalent results are also presented for the orbital currents. We also find that the time-averaged energy grows as N2 in the quasi-integrable regime but changes to a linear N dependence in the chaotic regime. In contrast, the results with Bose statistics are akin to the single-particle case and thus different from the fermionic case. We also give an estimate of possible experimental parameters where our results may be seen in semiconductor quantum dot billiards." @default.
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- W2042797554 date "1999-08-01" @default.
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- W2042797554 title "Pauli principle and chaos in a magnetized disk" @default.
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- W2042797554 doi "https://doi.org/10.1103/physreve.60.1590" @default.
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