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9 results on '"Liu, Bao-Tong"'

4. Exciton states in metal halide perovskites under the effect of carrier-longitudinal optical phonon coupling.

Author

Liu, Bao-Tong and Chen, Ying-Jie

Subjects
*METAL halides, *PEROVSKITE, *PHONONS, *BINDING energy, *PSEUDOPOTENTIAL method, *PHOTOELECTRICITY, *POLARONS, *TRAIL running
Abstract

Exciton states are essential to comprehend the basal photoelectric properties in metal halide perovskites (MHPs) and provide reference for their future research, in which the exciton binding energy (EBE), determining the balance of the populations between excitons and free carriers, plays an important role in defining the optoelectronic utilization of MHPs. Thereby, we theoretically study the effects of bound potentials, due to the exciton coupling with the longitudinal optical (LO) phonon, between the electron and hole of the exciton on the EBE applying the variational method by using different effective potentials and two trail wavefunctions. We find that the EBE of this kind of materials is not only related to the chemical composition, but also remains inseparable from the space size, dielectric constant and LO-phonon energy, moreover, these correlations are better described by Barentzen potential. In addition, the results also show that the effects of carriers-LO-phonon coupling can explain the relationships between the EBE and exciton active range and effective Bohr radius to a certain extent, and can analyze their intrinsic correlation among these factors. These findings enable us to explain some experimental results and provide some help to understand optical electric dynamics in MHPs. [ABSTRACT FROM AUTHOR]

Published
2023
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9. Theoretical research on two gaps in cuprate superconductors:an electronic Raman scattering study

Author

Chen San, Lu Hong-Yan, and Liu Bao-Tong

Subjects
Superconductivity, Materials science, Condensed matter physics, Transition temperature, Doping, General Physics and Astronomy, symbols.namesake, Condensed Matter::Superconductivity, symbols, Cuprate, Pseudogap, Raman spectroscopy, Raman scattering, Phase diagram
Abstract

Electronic Raman experiments have shown the presence of two types of gaps in hole-doped cuprate superconductors: one is the gap that increases with underdoping and survives in the pseudogap normal state and the other is the gap that traces the superconducting dome and disappears above the transition temperature. This two-gap behavior is important in that it is related to the mechanism of the pseudogap. By calculating the electronic Raman spectra we show that this behavior is consistent with the picture in which the d-wave superconducting (SC) order and d-density-wave (DDW) order compete in the phase diagram. In particular, the energy of the B1g peak is determined by both the SC and the DDW orders, increases with underdoping and survives in the DDW normal state. On the other hand, the B2g peak is shown to be sensitive to the SC order alone, and thus vanishes in the normal state (even if in the presence of the DDW order). The doping dependence and the temperature dependence of the peak energies in the two channels accord nicely with recent experimental results, which strongly supports the competing-order point of view for the superconducting and pseudogap phases.

Published
2011

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