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

Authors
Hilke, MShahar, DSong, SHTsui, DCXie, YH
Issue Date
Sep-2000
Publisher
AMER PHYSICAL SOC
Citation
PHYSICAL REVIEW B, v.62, no.11, pp 6940 - 6943
Pages
4
Journal Title
PHYSICAL REVIEW B
Volume
62
Number
11
Start Page
6940
End Page
6943
URI
https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/29807
DOI
10.1103/PhysRevB.62.6940
ISSN
1098-0121
1550-235X
Abstract
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 Boating up of the lowest energy level due to the disorder broadening, 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 a filling factor of 1.
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