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Spontaneous Persistent Currents in Mesoscopic Rings

100%
Zipper E., Szopa M.
Acta Physica Polonica A
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1995
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vol. 87
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issue 1
79-84
EN
Persistent currents in mesoscopic systems made of a very clean metal and with nearly flat Fermi surface are studied. It is shown that the inclusion of the orbital magnetic interaction between electrons can lead to sponta­neous currents (spontaneous fluxes) and to quantized flux trapping if the number of interacting electrons is large enough: The energy of the system is discussed and the self-consistent formulas for the spontaneous flux and for the quantized flux in the system is derived. The influence of the spin on the presented phenomena is discussed.
2
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Mutual Inductance and Selfinductance in Mesoscopic Systems

81%
Zipper E., Dajka J., Szopa M.
Acta Physica Polonica A
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2002
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vol. 102
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issue 3
419-428
EN
The role played by the magnetostatic interaction in mesoscopic multichannel systems is discussed. We show that the interaction of currents from different channels, when taken in the selfconsistent mean field approximation, leads to selfinductance terms in the Hamiltonian producing an internal magnetic flux. Such multichannel systems can exhibit spontaneous flux or flux expulsion. The dependence of these phenomena on the parameters of the system is discussed.
3
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Collective Phenomena in Multiwall Carbon Nanotubes

81%
Margańska M., Szopa M., Zipper E.
Acta Physica Polonica A
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2004
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vol. 106
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issue 5
609-616
EN
Collective phenomena due to persistent currents in carbon multiwall nanotubes are studied. The formula for persistent currents minimising free energy and conditions for the stability of persistent currents in multiwall nanotubes in magnetic field are derived. Numerical calculations performed show the possibility of obtaining spontaneous currents in two optimal configurations: undoped armchair-only multiwall nanotubes up to 0.01 K, and zig-zag-chiral-chiral-zig-zag multiwall nanotubes doped to -3.033 eV up to about 1 K. The latter configuration may exhibit also the diamagnetic expulsion of magnetic field, which according to our calculations can reach 20% of the external flux.
4
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On the Possibility of Spontaneous Currents in Mesoscopic Systems

71%
Zipper E., Szopa M., Wohlleben D., Freche P., Esser M.
Acta Physica Polonica A
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1993
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vol. 84
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issue 1
203-211
EN
It is shown that a mesoscopic metallic system can exhibit a phase transition to a low temperature state with a spontaneous orbital current if it is sufficiently free of elastic defect scattering. The interaction among the electrons, which is the reason of the phase transition, is of the magnetic origin and it leads to an ordered state of the orbital magnetic moments.
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