کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1543547 | 1512868 | 2016 | 5 صفحه PDF | دانلود رایگان |
• Evolution of the band structure when applying strain.
• Evolution of energy gap and effective mass when applying strain.
• Strain-induced semi-Dirac band and band inversion.
• Optic absorption and its anisotropy under strain.
We studied the electronic structure and optic absorption of phosphorene (monolayer of black phosphorus) under strain. Strain was found to be a powerful tool for the band structure engineering. The in-plane strain in armchair or zigzag direction changes the effective mass components along both directions, while the vertical strain only has significant effect on the effective mass in the armchair direction. The band gap is narrowed by compressive in-plane strain and tensile vertical strain. Under certain strain configurations, the gap is closed and the energy band evolves to the semi-Dirac type: the dispersion is linear in the armchair direction and is gapless quadratic in the zigzag direction. The band-edge optic absorption is completely polarized along the armchair direction, and the polarization rate is reduced when the photon energy increases. Strain not only changes the absorption edge (the smallest photon energy for electron transition), but also the absorption polarization.
Journal: Physica E: Low-dimensional Systems and Nanostructures - Volume 81, July 2016, Pages 177–181