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phonon n.【物理學】聲子〔晶體點陣振動能的量子〕。

In addition to the strong gap - like lo1 mode and weak forbidden to1 mode , the second order raman scattering of the brillouin zone - edge phonon ( 2lo1 ( l ) mode and 2to1 ( x ) mode ) as well as the scattering of the brillouin zone - center phonon were observed . also , the nitrogen local mode ( 495 cm - 1 ) associated with the nn center and the so - called “ x “ mode ( 387 cm - 1 ) of the lo phonon ( manifest 在一級喇曼散射譜中,得到了gap的lo ( p )聲子峰和強度較弱的禁戒的to ( p )模,還觀測到了在495cm - ,處的n的局域模和在387cm一,處的由n導致的lo ( n )聲子模。

Because there exists the different strength of coupling between the electron and phonon , there have some different ways , such as the perturbation theory , variation theory , green function theory and the feynman “ s path integral approach . they can be appropriately used in different area Frohlich極化子哈密頓中電子和光學聲子耦合強弱不同,有著不同的研究方法,諸如微擾論,變分法, green函數方法,以及feynman的路徑積分方法,這些方法處理問題的范圍是不同的。

To the part of slack ' s theory , the oxide thermoelectric material calcium cobalt oxide ( ca3co2o6 ) is a “ phonon glass and an electron crystal “ or pgec 從slack的理論看來,它是一個“電子晶體、聲子玻璃”的理想化模型。

In addition to the strong gap - like lo1 mode and weak forbidden to1 mode , the second order raman scattering of the brillouin zone - edge phonon ( 2lo1 ( l ) mode and 2to1 ( x ) mode ) as well as the scattering of the brillouin zone - center phonon were observed . also , the nitrogen local mode ( 495 cm - 1 ) associated with the nn center and the so - called “ x “ mode ( 387 cm - 1 ) of the lo phonon ( manifest 在一級喇曼散射譜中,得到了gap的lo ( p )聲子峰和強度較弱的禁戒的to ( p )模,還觀測到了在495cm - ,處的n的局域模和在387cm一,處的由n導致的lo ( n )聲子模。

Because there exists the different strength of coupling between the electron and phonon , there have some different ways , such as the perturbation theory , variation theory , green function theory and the feynman “ s path integral approach . they can be appropriately used in different area Frohlich極化子哈密頓中電子和光學聲子耦合強弱不同,有著不同的研究方法,諸如微擾論,變分法, green函數方法,以及feynman的路徑積分方法,這些方法處理問題的范圍是不同的。

To the part of slack ' s theory , the oxide thermoelectric material calcium cobalt oxide ( ca3co2o6 ) is a “ phonon glass and an electron crystal “ or pgec 從slack的理論看來,它是一個“電子晶體、聲子玻璃”的理想化模型。

phonophore

In addition to the strong gap - like lo1 mode and weak forbidden to1 mode , the second order raman scattering of the brillouin zone - edge phonon ( 2lo1 ( l ) mode and 2to1 ( x ) mode ) as well as the scattering of the brillouin zone - center phonon were observed . also , the nitrogen local mode ( 495 cm - 1 ) associated with the nn center and the so - called “ x “ mode ( 387 cm - 1 ) of the lo phonon ( manifest 在一級喇曼散射譜中,得到了gap的lo ( p )聲子峰和強度較弱的禁戒的to ( p )模,還觀測到了在495cm - ,處的n的局域模和在387cm一,處的由n導致的lo ( n )聲子模。

The physical property of electron - phonon interaction systems is one of the fundamental problems in condensed matter theory . its development and perfection will profit the solving of some important problems in the areas of condensed matter physics , materials physics , protein molecular dynamics as well as other related subjects . so the study of the nonlinear lattice effects in electron - phonon interaction systems has been received extensive attention of many researches in the past years 電子-聲子耦合系統的物理特性是凝聚態理論中的一個基本問題,它的發展和完善可能為凝聚態物理與材料物理領域及蛋白質分子生物學等交叉學科領域中一些重要問題的解決帶來一定的啟示甚至突破性的進展,因而近幾年來電子-聲子耦合系統中晶格非線性效應的研究受到人們的廣泛關注。

We obtain that i ) with the increase of the phonon - pseudospin interaction and the thickness of the superlattice , the phase transition temperature of the superlattice will increase . ii ) the increase of the phonon - pseudospin interaction leads to the change of the number of the pyroelectric peaks in the temperature curve of pyroelectric coefficient and to the change of the pyroelectric coefficient 研究發現,聲子與贗自旋的相互作用會影響鐵電超晶格熱電峰的數目以及熱電系數的溫度曲線的形態,而且聲子與贗自旋耦合作用的增強以及超晶格尺寸的增大都會使整個材料的相變溫度增加。

Topics covered include : crystal lattices , electronic energy band structures , phonon dispersion relatons , effective mass theorem , semiclassical equations of motion , and impurity states in semiconductors , band structure and transport properties of selected semiconductors , and connection of quantum theory of solids with quasifermi levels and boltzmann transport used in device modeling 被覆蓋的論題包括:晶格、電子能帶結構、聲子色散關系、有效質量理論、半經典運動方程和半導體中的非純態、選擇性半導體的帶結構和輸運性質固體量子理論與準費米能級以及用于器件建模的玻爾茲曼輸運理論之間的聯系。

Treating the anharmonic terms of potential energy as perturbations , and employing the formulas for atomic displacements and hamiltonian in phonon occupation number representation , the formulas for thermal expansion coefficients of crystal nano - wires are derived and the numerical calculations are carried out in this paper 摘要將原子間相互作用勢的非諧項作為微擾,運用聲子數表象中的晶格原子振動位移和晶格振動哈密頓公式,推導了納米晶體線的熱膨脹系數公式,并進行了數值計算。

A review of the cmr mechanism in perovskites . this chapter gives review of cmr mechanism , earlier research works on gmr mechanism are listed . some special physics concepts , such as double exchange ( de ) , jahn - teller ( j - t ) effect , electron - phonon coupling , are interpreted 第三章綜述了對鈣鈦礦結構氧化物巨磁電阻效應機制的研究,對cmr產生機理做了簡單的介紹,并對諸如雙交換( de )作用、 jahn - teller效應、電荷有序等物理概念有所認識的基礎上總結了已經報道的對巨磁電阻效應機制的研究,最后指出探索cmr效應及其相關現象的途徑。

Based on the given linear holstein model , and using the variational method we obtained the ground state properties of the electron - phonon interaction system with cubic and quartic lattice ( phonon ) terms . we obtained the relations between the ground state energy and the phonon squeezing effect and polaron squeezing effect as well as the variation of the polaron bandwidth 在線性holstein模型的基礎上,采用變分法得出了含晶格(聲子)三次方和四次方勢下系統基態特性,得到了基態能量與聲子壓縮效應和極化子壓縮效應的關系,并求得了極化子能帶寬度的變化規律。

In this thesis , we study the nonlinear effects in electron - phonon interaction of one or quasi - one dimensional system with the nonlinearity of phonon ( lattice ) . using the variational method and coherent method we study the ground state properties of one - dimensional molecular crystal and the soliton characteristics in protein molecular chain , respectively 本文以較簡單的一維(或準一維)電子-聲子耦合系統為對象,在計入聲子(晶格)非線性的條件下,分別采用變分法和量子相干態方法研究了一維分子晶體基態的性質和蛋白質分子鏈中孤立子特性。

We consider the long - range interaction , the phonon - pseudospin interaction , the interfacial effects and the size effect respectively . firstly , within the framework of spin - 1 / 2 transverse ising model ( tim ) , the long - range effects on the pyroelectric properties of a ferroelectric superlartice are studied by use of the beyond mean - field theory 應用超越平均場的理論、格林函數方法,在橫場伊辛模型的框架內,考慮了贗自旋間的長程相互作用、聲子與贗自旋的相互作用、界面效應和尺寸效應,對鐵電超晶格的熱電性質進行了較深入的研究。

According to the raman selection rule and the pl measurement , it is reasonable to evaluate the quality of galnp / algalnp mqw by analyzing the relative intensity ratio of a1p - lo / to . ( 4 ) a new modified random element isodisplacement ( mrei ) model is set up to calculate the dependence between the long - wavelength optical phonon frequencies and the composition of iii - v - type ab1 - xcx mixed crystals . the second neighbor force constants are still assumed to be a linear variation with the composition , but the two first neighbor force constants can be evaluated to be a negative exponent variation with the composition , using the overlapped repulsive potential of the ion crystal combination 通過實驗我們找到了在這些結構參數上生產gainp algainpmqw的較理想的結果; ( 3 )首次用喇曼( raman )散射方法研究了常溫下的gainp algainp多量子阱結構,除了指認出喇曼光譜中各光學聲子模外,還結合樣品光致發光譜的測量結果,分析發現喇曼光譜中alp - lo to的相對強度比可以在一定程度上評定晶體gainp algainpmqw的生長質量; ( 4 )在修正的隨機元素等位移? mrei模型的基礎上建立了一個新模型,計算了ab _ ( 1 - x ) c _ x型?族半導體混晶的長波長光學聲子模頻率的組分變化關系。

Because there exists the different strength of coupling between the electron and phonon , there have some different ways , such as the perturbation theory , variation theory , green function theory and the feynman “ s path integral approach . they can be appropriately used in different area Frohlich極化子哈密頓中電子和光學聲子耦合強弱不同,有著不同的研究方法,諸如微擾論,變分法, green函數方法,以及feynman的路徑積分方法,這些方法處理問題的范圍是不同的。

Abstract : we conduct a theoretical study on the properties of a bound polaron in a quantum well under an electric field using linear combination operator and unitary transformation methods , which are valid in the whole range of electron - lo phonon coupling . the changing relations between the ground - state energy of the bound polaron in the quantum well and the coulomb bound potential , the electric field strength , and the well width are derived . the numerical results show that the ground - state energy increases with the increase of the electric field strength and the coulomb bound potential and decreases as the well width increases 文摘:采用線性組合算符及幺正變換方法研究了電場對量子阱弱耦合束縛極化子的性質的影響.推導出量子阱中束縛極化子的基態能量和庫侖束縛勢、電場和阱寬的變化關系.數值計算結果表明,基態能量因電場和庫侖束縛勢的不同而不同,隨電場和庫侖束縛勢的增大而增大,隨阱寬的增大而迅速減小

Influence of strain on subband structure is described by a factor dk , which is the phonon induced band deformation potential extracted from experiment data . in strained si conduction band , the value of dk is 2 . 4 times larger than its si counterpart 在該模型中,應力對子能帶結構的影響通過聲子的形變勢能dk表示, dk為經實驗修正得到的經驗參數,在應變硅導帶中,其值是體硅材料形變勢能的2 . 4倍。