Laterally coupled and field-induced quantum Hall systems

A quantum Hall system which is divided into two laterally coupled subsystems by means of a tunneling barrier exhibits a complex Landau level dispersion. Magnetotunneling spectroscopy is employed to investigate the small energy gaps which separate subsequent Landau bands. The control on the Fermi level permits to trace the anticrossings for varying magnetic fields. The band structure calculation predicts a magnetic shift of the band gaps on the scale of the cyclotron energy. This effect is confirmed experimentally by a displacement of the conductance peaks on the axis of the filling factor. Tunneling centers within the barrier are responsible for quantum interferences between opposite edge channels. Due to the disorder potential, the corresponding Aharonov-Bohm interferometers generate additional long-period and irregular conductance features. In the regime of strong localization, conductance fluctuations occur at small magnetic fields before the onset of the regular Landau oscillations. The Landau dispersion is obtained by a dedicated algorithm which solves the Schroedinger equation exactly for a single electron residing in a quantum Hall system with an arbitrary unidirectional, threefold staircase potential.Comment: 20 pages, 11 figures, 1 table; v2: explanation added in section 2, some minor change

Des Bartholomäus von Sct. Aegidius Chronik von Prag im Reformationszeitalter. Chronica de seditione et tumultu Pragensi 1524-1531. Im lateinischen Texte zum ersten Male auf Kosten und unter Mitwirkung der K. Böhmischen Gesellschaft der Wissenschaften hrsg. und mit historischer Einleitung begleitet von C. Höfler.

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Bartošova kronika pražská od léta Páně 1524 až do konce léta 1530 : dle dvou rukopisů cís. veřejné knihovny Pražské /

"Sešit 1" -- p. preceding t.p.Mode of access: Internet

Lid a národ; sebrané rozpravy národopisné a literárni.

Bibliographical footnotes.Mode of access: Internet

Skladba /

Includes index.Mode of access: Internet