Two-Dimensional Magnetotransport in a Black Phosphorus Naked Quantum Well
| Autor: | Tayari, V., Hemsworth, N., Fakih, I., Favron, A., Gaufrès, E., Gervais, G., Martel, R., Szkopek, T. |
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| Rok vydání: | 2014 |
| Předmět: | |
| Zdroj: | Nature Comm. 6, 7702 (2015) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1038/ncomms8702 |
| Popis: | Black phosphorus (bP) is the second known elemental allotrope with a layered crystal structure that can be mechanically exfoliated down to atomic layer thickness. We have fabricated bP naked quantum wells in a back-gated field effect transistor geometry with bP thicknesses ranging from $6\pm1$ nm to $47\pm1$ nm. Using an encapsulating polymer superstrate, we have suppressed bP oxidation and have observed field effect mobilities up to 600 cm$^2$/Vs and on/off current ratios exceeding $10^5$. Importantly, Shubnikov-de Haas (SdH) oscillations observed in magnetotransport measurements up to 35 T reveal the presence of a 2-D hole gas with Schr\"odinger fermion character in an accumulation layer at the bP/oxide interface. Our work demonstrates that 2-D electronic structure and 2-D atomic structure are independent. 2-D carrier confinement can be achieved in layered semiconducting materials without necessarily approaching atomic layer thickness, advantageous for materials that become increasingly reactive in the few-layer limit such as bP. Comment: 7 pages, 8 figures |
| Databáze: | arXiv |
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