In this project, first, I intend to continue our study of the electronic properties of metal chalcogenide materials with the spin-orbit coupling and electron-electron interactions using tight-binding method. The onsite spin-orbit coupling effectively removes the spin degeneracy in the valence band edges around the K points and causes these spin- polarized states having quite different behaviors. Since the electrons can be excited by linearly and circularly polarized light, in magneto- optical spectra, selection rules can be effectively determined as well. Particularly, absorption lines can be used to provide a direct evidence of the spin-orbit coupling. Next, in order to account for the luminescence experiments, the behavior of the band structure should be deepened understanding through the band structure parameters and selection rules of the 2D InSe. Therefore, the masses of electron, hole and exciton should be well understood to interpret the experimentally observed transitions. Moreover, I will study the ring shape of the Fermi surface based on the tight-binding calculation. The Fermi surface ring is attributed to the Fermi energy across the valence band edge. The emergent magnetic moment as increasing the hole doping in InSe may lead to the instability of the Fermi surface and makes the phase transition from the paramagnetism to ferromagnetism.
|Effective start/end date||2018/08/01 → 2020/12/31|
- metal chalcogenide
- spin-orbit coupling
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