Phase diagram of the integer quantum Hall effect in p-type Germanium

Details Phase diagram of the integer quantum Hall effect in p-type Germanium Phase diagram of the integer quantum Hall effect in p-type Germanium

1999-06-15

arxiv.org/abs/cond-mat/9906212v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures, some changes in the text

Scientific paper

10.1103/PhysRevB.62.6940

We experimentally study the phase diagram of the integer quantized Hall effect, as a function of density and magnetic field. We used a two dimensional hole system confined in a Ge/SiGe quantum well, where all energy levels are resolved, because the Zeeman splitting is comparable to the cyclotron energy. At low fields and close to the quantum Hall liquid-to-insulator transition, we observe the floating up of the lowest energy level, but NO FLOATING of any higher levels, rather a merging of these levels into the insulating state. For a given filling factor, only direct transitions between the insulating phase and higher quantum Hall liquids are observed as a function of density. Finally, we observe a peak in the critical resistivity around filling factor one.

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