RANDOM-PHASE-APPROXIMATION STUDY OF THE RESPONSE FUNCTION DESCRIBING OPTICAL 2ND-HARMONIC GENERATION FROM A METAL SELVEDGE
RANDOM-PHASE-APPROXIMATION STUDY OF THE RESPONSE FUNCTION DESCRIBING OPTICAL 2ND-HARMONIC GENERATION FROM A METAL SELVEDGE
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DOI：
10.1103/physrevb.33.990
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发表时间：
1986-01-15
影响因子：
3.7
通讯作者：
KELLER, O
中科院分区：
文献类型：
--
作者：
KELLER, O
中心对称金属中光学二次谐波的产生是由于边缘逆对称的破坏和非局域效应。本文给出了非均匀凝胶的非局部非线性电导率张量的随机相位近似描述。重点研究了边缘的电偶极子响应，以及剖面区域和体的磁偶极子和电四极子响应。详细分析了与p⋅A和A⋅A相互作用相关的张量对称格式。确定了偶极子和四极子跃迁，并讨论了直接和间接量子过程的作用。在所谓的无限势垒模型的基础上，给出了一些数值结果。
Optical second-harmonic generation in centrosymmetric metals stems from the breaking of inversion symmetry in the selvedge and from nonlocal effects. In the present work a random-phase-approximation description of the nonlocal nonlinear conductivity tensor of an inhomogeneous jellium is given. Main emphasis is devoted to a study of the electric dipole response from the selvedge, and to the magnetic dipole and electric quadrupole responses from the profile region and the bulk. A detailed analysis of the tensor symmetry schemes associated with the p⋅ A and A⋅ A interactions is presented. Dipole and quadrupole transitions are identified, and the role of direct and indirect quantum processes is discussed. On the basis of the so-called infinite-barrier model, a few numerical results are given.