Competing Quantum Hall Phases in the Second Landau Level in Low Density Limit
| Autor: | Loren Pfeiffer, Wei Pan, L. Yin, Ken W. West, Alessandro Serafin, Jian-Sheng Xia, Kirk Baldwin, Neil Sullivan, D. C. Tsui |
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| Rok vydání: | 2015 |
| Předmět: |
Physics
Electron density Condensed matter physics Quantum limit 02 engineering and technology Quantum phases Landau quantization Quantum Hall effect Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Quantum spin Hall effect Landau pole 0210 nano-technology Quantum statistical mechanics |
| DOI: | 10.2172/1177382 |
| Popis: | We present in this Letter the results from two high quality, low density GaAs quantum wells. In sample A of electron density n=5.010 10 cm -2 , anisotropic electronic transport behavior was observed at =7/2 in the second Landau level. We believe that the anisotropy is due to the large Landau level mixing effect in this sample. In sample B of density 4.110 10 cm -2 , strong 8/3, 5/2, and 7/3 fractional quantum Hall states were observed. Furthermore, our energy gap data suggest that, similar to the 8/3 state, the 5/2 state may also be spin unpolarized in the low density limit. The results from both samples show that the strong electron-electron interactions and a large Landau level mixing effect play an import role in the competing ground states in the second landau level. |
| Databáze: | OpenAIRE |
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