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Pressure-Induced Shift of R-Line of MgO：Cr^3＋ with electron-phonon interaction Effect

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Communications in Theoretical Physics 2007年第2X期48卷 357-362页

作者： ZHANG Zheng-Jie MA Dong-Ping College of Information Engineering Chengdu University of Technology Chengdu 610059 China Department of Applied Physics Sichuan University Chengdu 610065 China

By means of improved ligand-field theory, the ＂pure electronic＂ pressure-induced shift （PS） and the PS due to electron-phonon interaction （EPI） of R-line of MgO：Cr^3＋ have been calculated, respectively. The calculated results are in very good agreement with the experimental data. The behaviors of the pure electronic PS of R-line of MgO：Cr^3＋ and the PS of its R-line due to EPI are different. It is the combined effect of them that gives rise to the total PS of R-line, which has satisfactorily explained the experimental results. The comparison between the feature of R-line PS of MgO：Cr^3＋ and that of R1-line PS of ruby has been made.

关键词： high-pressure effect electron-phonon interaction R-line improved ligand-field theory admixture of |t2^2(3T1)e^4T2) and |t2^32E)

Improved Ligand-Field Theory with Effect of electron-phonon interaction

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Communications in Theoretical Physics 2005年第3期43卷 529-538页

作者： MADong-Ping CHENJu-Ron DepartmentofAppliedPhysics SichuanUniversityChengdu610065China／／InternationalCentreforMaterialsPhysicsAcademiaSinicaShenyang110015China DepartmentofAppliedPhysics SichuanUniversityChengdu610065China

Traditional ligand-field theory has to be improved by taking into account both 'pure electronic' contribution and electron-phonon interaction one (including lattice-vibrational relaxation energy). By means of improved ligand-field theory, R1, R2, R'3, R'2, and R'1 lines, U band, ground-state zero-field-splitting (GSZFS), and ground-state g factors of ruby and/or GSGG: Cr3+ as well as thermal shifts of GSZFS, R1 line and R2 line of ruby have been *** results are in very good agreement with the experimental data. Moreover, it is found that the value of cubic-field parameter given by traditional ligand-field theory is inappropriately large. For thermal shifts of GSZFS, R1 line and R2 line of ruby, several conclusions have also been obtained.

关键词： improved ligand-field theory electron-phonon interaction Stokes shift energy spectrum thermal shift g factor

Effects of electron-phonon interaction on Linear and Nonlinear Optical Absorption in Cylindrical Quantum Wires

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Communications in Theoretical Physics 2008年第6期49卷 1615-1618页

作者： YU You-Bin School of Science Ningbo University of Technology Ningbo 315016 China

The electron-phonon interaction influences on lineax and nonfineax optical absorption in cylindrical quantum wires （CQW） with an infinite confining potential axe investigated. The optical absorption coefficients are obtained by using the compact-density-matrix approach and iterative method, and the numerical results are presented for GaAs CQW. The results show that the electron-phonon interaction makes a distinct influence on optical absorption in CQW. The electron-phonon interaction on the wave functions of electron dominates the values of absorption coefficients and the correction of the electron-phonon effect on the energies of the electron makes the absorption peaks blue shift and become wider. Moreover, the electron-phonon interaction influence on optical absorption with an infinite confining potential is different from that with a finite confining potential.

关键词： quantum wire optical absorption electron-phonon interaction

Optical Conductivity of Graphene Sheet Including electron-phonon interaction

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Communications in Theoretical Physics 2012年第3期57卷 482-484页

作者： Hamze Mousavi Department of Physics Razi UniversityKermanshahIran Nano Science and Nano Technology Research Center Razi UniversityKermanshahIran

Using an expression of optical conductivity,based on the linear response theory,the Green's function technique and within the Holstein Hamiltonian model,the effect of electron-phonon interaction on the optical conductivity of graphene plane is *** is found that the electron-phonon coupling increases the optical conductivity of graphene sheet in the low frequency region due to decreasing quasiparticle weight of electron excitation while the optical conductivity reduces in the high frequency *** latter is due to role of electrical field's frequency.

关键词： graphene optical conductivity Holstein model electron-phonon interaction Green's function

Photo-Induced Ultrafast electron Dynamics in Anatase and Rutile TiO_(2):Effects of electron-phonon interaction

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Chinese Journal of Chemical Physics 2022年第2期35卷 270-280,I0005,I0006,I0001,I0002页

作者： Man Lian Yu-Chen Wang Shiping Peng Yi Zhao State Key Laboratory of Physical Chemistry of Solid Surfaces Fujian Provincial Key Lab of Theoretical and Computational Chemistryand College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China

The photo-induced ultrafast electron dynamics in both anatase and rutile TiO_(2) are investigated by using the Boltzmann transport equation with the explicit incorporation of electron-phonon scattering *** structural parameters required for dynamic simulations are obtained from ab initio *** results show that although the longitudinal optical modes significantly affect the electron energy relaxation dynamics in both phases due to strong Fr?hlich-type couplings,the detailed relaxation mechanisms have obvious *** the case of a single band,the energy relaxation time in anatase is 24.0 fs,twice longer than 11.8 fs in *** discrepancy is explained by the different diffusion distributions over the electronic Bloch states and different scattering contributions from acoustic modes in the two *** for the multiple-band situation involving the lowest six conduction bands,the predicted overall relaxation times are about 47 fs and 57 fs in anatase and rutile,respectively,very different from the case of the single *** slower relaxation in rutile is attributed to the existence of multiple rate-controlled steps during the dynamic *** present findings may be helpful to control the electron dynamics for designing efficient TiO_(2)-based devices.

关键词： Titanium dioxide electron-phonon interaction Ultrafast dynamics Boltzmann transport equation

Optical vibration modes and electron-phonon interaction in ternary mixed crystals of polar semiconductors

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Chinese Physics B 2004年第1期13卷 71-81页

作者：梁希侠班士良 DepartmentofPhysics InnerMongoliaUniversityHohhot010021China

Optical vibrations of the lattice and the electron-phonon interaction in polar ternary mixed crystals are studied in the framework of the continuum model of Born and Huang and the random-element-isodisplacement model. A normal-coordinate system to describe the optical vibration in ternary mixed crystals is correctly adopted to derive a new Frohlich-like Hamiltonian for the electron-phonon interaction including the unit-cell volume variation *** numerical results for the phonon modes, the electron-phonon coupling constants and the polaronic energies for several typical materials are obtained. It is verified that the nonlinearity of the electron-phonon coupling effects with the composition is essential and the unit-cell volume effects cannot be neglected for most ternary mixed crystals.

关键词： optical vibration mode electron-phonon interaction ternary mixed crystal

PERSISTENT CURRENT IN A ONE-DIMENSIONAL MESOSCOPIC RING WITH electron-phonon interaction IN THE LATTICE MODEL

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Journal of Shanghai Jiaotong university(Science) 2001年第2期6卷 123-125,130页

作者：李铜忠 Dept. of Physics Shanghai Jiaotong Univ.

A new non-perturbative method is used to discuss the persistent current in a one-dimensional mesoscopic ring threaded by a flux φ with electron-phonon interaction in the lattice model. The current is periodic in φ with a flux quantum φ 0 and the electron-phonon interaction suppresses the persistent current. By considering the contributions of many-phonon correlations, we could obtain more accurate results.

关键词： mesoscopic ring electron-phonon interaction lattice model persistent current

Versatile band structure and electron-phonon coupling in layered PtSe_(2) with strong interlayer interaction

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Nano Research 2022年第7期15卷 6613-6619页

作者： Junbo He Xudan Zhu Weiming Liu Ertao Hu Jianlu Wang Rongjun Zhang Department of Optical Science and Engineering Fudan UniversityShanghai 200433China College of electronic and Optical Engineering Nanjing University of Posts and TelecommunicationsNanjing 210023China Institute of Optoelectronics Fudan UniversityShanghai 200433China Academy for Engineering and Technology Fudan UniversityShanghai 200433China Yiwu Research Institute of Fudan University Yiwu 322000China

The large tunability in the band structure is ubiquitous in two-dimensional(2D)materials,and PtSe_(2) is not an exception,which has attracted considerable attention in electronic and optoelectronic applications due to its high carrier mobility and long-term *** dimensional dependent properties are closely related to the evolution of electronic band *** points(CPs),the extrema or saddle points of electronic bands,are the cornerstone of condensed-matter physics and fundamentally determine the optical and transport phenomena of the layered PtSe_(2).Here,we have experimentally revealed the detailed electronic structures in layered PtSe_(2),including the CPs in the Brillouin zones(BZs),by means of reflection contrast spectroscopy and spectroscopic ellipsometry(SE).There are three critical points in the BZs attributed to the excitonic transition,quasi-particle band gap,and the band nesting effect related transition,*** CPs show red-shifting trends with increasing layer number under the mechanism of strong interlayer *** have further revealed the electron–phonon(e–ph)interaction in such layered material,utilizing temperature-dependent absorbance *** strength of e–ph interaction and the average phonon energy also decline with the increasement of layer *** findings give a deep understanding to the physics of the layer-dependent evolution of the electronic structure of PtSe_(2),potentially leading to applications in optoelectronics and electronic devices.

关键词： layered transition metal dichalcogenides PtSe_(2)thin films interlayer coupling critical points electron-phonon interaction

Anisotropic polarization due to electron-phonon interactions in graphene

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Journal of Semiconductors 2009年第11期30卷 6-9页

作者：李武群曹俊诚 State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of Sciences

Polarization plays an important role in the Raman spectroscopy. We study, in graphene, anisotropic polarization due to electron-phonon coupling （EPC）. The numerical results show that the anisotropy is obvious even when the wave vector is in the range of the Raman experiment. The analytical expression is deduced from the structure factor, which indicates the crucial origin of the anisotropy. We also find that, as the phonon energy increases the polarization is clearly weakened due to the screen effect of EPC, but the anisotropy totally remains.

关键词： graphene electron-phonon interaction anisotropy polarization