Electronic bandstructure of in-plane ferroelectric van der Waals $\beta '-In_{2}Se_{3}$
| العنوان: | Electronic bandstructure of in-plane ferroelectric van der Waals $\beta '-In_{2}Se_{3}$ |
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| المؤلفون: | Chutian Wang, E. Huwald, Jack Hellerstedt, Sung-Kwan Mo, Michael S. Fuhrer, Shujie Tang, Anton Tadich, Antonija Grubišić-Čabo, J.D. Riley, Mark T. Edmonds, James L. Collins, Changxi Zheng, Nikhil V. Medhekar, Yuefeng Yin |
| سنة النشر: | 2019 |
| مصطلحات موضوعية: | Condensed Matter - Materials Science, Materials science, Condensed matter physics, chemistry.chemical_element, Angle-resolved photoemission spectroscopy, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, 7. Clean energy, 01 natural sciences, Ferroelectricity, 3. Good health, 0104 chemical sciences, Electronic, Optical and Magnetic Materials, symbols.namesake, In plane, chemistry, Materials Chemistry, Electrochemistry, symbols, van der Waals force, 0210 nano-technology, Electronic band structure, Indium |
| الوصف: | Layered indium selenides ($In_{2}Se_{3}$) have recently been discovered to host robust out-of-plane and in-plane ferroelectricity in the $\alpha$ and $\beta$' phases, respectively. In this work, we utilise angle-resolved photoelectron spectroscopy to directly measure the electronic bandstructure of $\beta '-In_{2}Se_{3}$, and compare to hybrid density functional theory (DFT) calculations. In agreement with DFT, we find the band structure is highly two-dimensional, with negligible dispersion along the c-axis. Due to n-type doping we are able to observe the conduction band minima, and directly measure the minimum indirect (0.97 eV) and direct (1.46 eV) bandgaps. We find the Fermi surface in the conduction band is characterized by anisotropic electron pockets with sharp in-plane dispersion about the $\overline{M}$ points, yielding effective masses of 0.21 $m_{0}$ along $\overline{KM}$ and 0.33 $m_{0}$ along $\overline{\Gamma M}$. The measured band structure is well supported by hybrid density functional theory calculations. The highly two-dimensional (2D) bandstructure with moderate bandgap and small effective mass suggest that $\beta'-In_{2}Se_{3}$ is a potentially useful new van der Waals semiconductor. This together with its ferroelectricity makes it a viable material for high-mobility ferroelectric-photovoltaic devices, with applications in non-volatile memory switching and renewable energy technologies. Comment: 19 pages, 4 + 1 figures; typos corrected;added references; updated figures & discussion to reflect changes in model |
| اللغة: | English |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f1685465e30b33187acfc9cd586a329b http://arxiv.org/abs/1910.05969 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....f1685465e30b33187acfc9cd586a329b |
| قاعدة البيانات: | OpenAIRE |
| الوصف غير متاح. |