| Issue |
Europhys. Lett.
Volume 40, Number 1, October 1997
|
|
|---|---|---|
| Page(s) | 67 - 72 | |
| Section | Condensed matter: electronic structure, electrical, magnetic and optical properties | |
| DOI | https://doi.org/10.1209/epl/i1997-00425-9 | |
| Published online | 01 September 2002 | |
Coulomb correlations and coherent charge tunneling in mesoscopic coupled rings
1
Department of Applied Physics, Chalmers University of Technology
and
Göteborg University, S-412 96 Göteborg, Sweden
2
Max-Planck-Institut für Physik komplexer Systeme,
Bayreuther Str. 40, D-01187 Dresden, Germany
Received:
29
May
1997
Accepted:
1
September
1997
We study the effect of a strong
electron-electron (e-e) interaction
in a system of two concentric one-dimensional rings with
incommensurate areas A1 and A2,
coupled by a tunnel amplitude.
For noninteracting particles the magnetic moment (persistent current) m of
the many-body ground state and
first excited states is an irregular function of the external
magnetic field.
In contrast, we show that when strong e-e
interactions are present
the magnetic-field dependence of m
becomes periodic.
In such a strongly correlated system disorder can only be caused by
inter-ring charge fluctuations, controllable by a gate voltage.
The oscillation period of m is
if fluctuations are
suppressed. Coherent inter-ring tunneling
doubles the period when charge fluctuations are
allowed.
PACS: 71.27.+a – Strongly correlated electron systems; heavy fermions / 73.20.Dx – Electron states in low-dimensional structures (superlattices, quantum well structures and multilayers) / 72.15.Nj – Collective modes (e.g., in one-dimensional conductors)
© EDP Sciences, 1997
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