Magnetic-field-induced anomalous phase transitions in p-SiGe/Si heterostructures
Journal
Journal of Physics Condensed Matter
Journal Volume
10
Journal Issue
43
Pages
9691-9699
Date Issued
1998
Author(s)
Abstract
We present the low-temperature magneto-transport measurements on a two-dimensional hole gas in the p-type modulation doped SiGe alloy confined by an Si barrier. We observe a magnetic-field-induced transition which occurs at high magnetic fields from an integer quantum Hall phase to a Hall insulator phase and finally reenters to a integer quantum Hall phase. This Hall insulator is centred at which is unanticipated by the global phase diagram. Scaling analysis and universal phenomena are found to be different at the two transition points. These results are attributed to the unusual energy level scheme in p-SiGe.
SDGs
Type
journal article