Experimental evidence of the ideal de Haas-van Alphen effect in a two-dimensional system

Link:

https://doi.org/10.1103/physrevb.73.125325

Autor/in:

Erscheinungsjahr:

2006

Medientyp:

Text

Beschreibung:

We have measured the magnetization oscillations-i.e., the de Haas-van Alphen (dHvA) effect-of high-mobility two-dimensional electron systems (2DES's) in modulation-doped AlGaAs GaAs heterostructures. In the sample exhibiting the highest oscillation amplitude of 2 μB* per electron we observe discontinuous jumps in the magnetization when an even integer number of Landau levels (LLs) is filled. This specific feature of the 2DES magnetization was predicted by Peierls more than 70 years ago but never observed in the experiments. Numerical simulations assuming no states between LLs remodel the jumps quantitatively. Measurements on samples with lower mobility reveal a finite background density of states between LLs that depends systematically on the filling factor. © 2006 The American Physical Society.

Lizenz:

info:eu-repo/semantics/closedAccess

Quellsystem:

Forschungsinformationssystem der UHH

Interne Metadaten

Quelldatensatz: oai:www.edit.fis.uni-hamburg.de:publications/fd715106-0568-4718-b584-243773da397f