Journal
NANO LETTERS
Volume 15, Issue 7, Pages 4650-4656Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b01409
Keywords
Black phosphorus; two-dimensional materials; ultrafast spectroscopy; electronic anisotropy; high field transport; hot carriers
Categories
Funding
- National Basic Research Program of China [2012CB921300, 2013CB921900, 2014CB920900]
- National Natural Science Foundation of China (NSFC) [11274015, 11174009]
- Recruitment Program of Global Experts, Beijing Natural Science Foundation [4142024]
- Specialized Research Fund for the Doctoral Program of Higher Education of China [20120001110066]
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Black phosphorus' has recently emerged as a promising material for high-performance electronic and optoelectronic device for its high mobility, tunable mid-infrared bandgap, and anisotropic electronic properties. Dynamical evolution of photoexcited carriers and the induced transient change of electronic properties are critical for materials' high-field performance but remain to be explored for black phosphorus. In this work, we perform angle-resolved transient reflection spectroscopy to study the dynamical evolution of anisotropic properties of black phosphorus under photoexcitation. We find that the anisotropy of reflectivity is enhanced in the pump-induced quasi-equilibrium state, suggesting an extraordinary enhancement of the anisotropy in dynamical conductivity in hot carrier dominated regime. These results raise attractive possibilities of creating high-field, angle-sensitive electronic, optoelectronic, and remote sensing devices exploiting the dynamical electronic anisotropy with black phosphorus.
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