Quantum Hall Effect in Electron-Doped Black Phosphorus Field-Effect Transistors
| Autor: | Fangyuan Yang, Kai Chang, Guo Jun Ye, Xianhui Chen, Naizhou Wang, Zuocheng Zhang, Yuanbo Zhang, Kenji Watanabe, Xiaoying Zhou, Wenkai Lou, Takashi Taniguchi |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
FOS: Physical sciences Bioengineering 02 engineering and technology Electron Quantum Hall effect 01 natural sciences law.invention Condensed Matter::Materials Science law Impurity 0103 physical sciences Mesoscale and Nanoscale Physics (cond-mat.mes-hall) General Materials Science Graphite 010306 general physics Anisotropy Condensed Matter - Materials Science Condensed Matter - Mesoscale and Nanoscale Physics Condensed matter physics Mechanical Engineering Transistor Materials Science (cond-mat.mtrl-sci) General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Field-effect transistor 0210 nano-technology Fermi gas |
| DOI: | 10.48550/arxiv.1809.07536 |
| Popis: | The advent of black phosphorus field-effect transistors (FETs) has brought new possibilities in the study of two-dimensional (2D) electron systems. In a black phosphorus FET, the gate induces highly anisotropic 2D electron and hole gases. Although the 2D hole gas in black phosphorus has reached high carrier mobilities that led to the observation of the integer quantum Hall effect, the improvement in the sample quality of the 2D electron gas (2DEG) has however been only moderate; quantum Hall effect remained elusive. Here, we obtain high quality black phosphorus 2DEG by defining the 2DEG region with a prepatterned graphite local gate. The graphite local gate screens the impurity potential in the 2DEG. More importantly, it electrostatically defines the edge of the 2DEG, which facilitates the formation of well-defined edge channels in the quantum Hall regime. The improvements enable us to observe precisely quantized Hall plateaus in electron-doped black phosphorus FET. Magneto-transport measurements under high magnetic fields further revealed a large effective mass and an enhanced Land\'e g-factor, which points to strong electron-electron interaction in black phosphorus 2DEG. Such strong interaction may lead to exotic many-body quantum states in the fractional quantum Hall regime. Comment: Accepted in Nano Letters |
| Databáze: | OpenAIRE |
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