Quantum Hall ferromagnetic transition in a Ge 2D hole system
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- National Taiwan Univ., Taipei (Taiwan)
When two Landau levels are brought into energy degeneracy, interesting phases and phase transitions can occur. For single-layer 2D electrons, a quantum Hall ferromagnetic transition (QHFT) occurs when Landau levels with opposite spins are made degenerate by an in-plane magnetic field, which enhances the Zeeman splitting but keeps the cyclotron energy constant. At the QHFT, the 2D electron system breaks up into magnetic domains with opposite spins, and a resistance spike is observed as electrons move through the domain wall loops. An alternative way to enhance the ratio of Zeeman splitting to the cyclotron energy, which is proportional to m*g*, is to reduce the carrier density (p). Here we report the observation of a QHFT at ν = 2 in a Ge 2D hole system through modulating p without any in-plane magnetic field. We also report the effects of an in-plane magnetic field to this QHFT.
- Research Organization:
- Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF); Ministry of Science and Technology (MOST), Taipei (Taiwan)
- DOE Contract Number:
- AC04-94AL85000
- OSTI ID:
- 1505345
- Report Number(s):
- SAND--2016-12433R; 649783
- Country of Publication:
- United States
- Language:
- English
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