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ApracticalmethodofinvestigatingthestraylightinlaserRamanspectrophotometerYINJianping,ZHUShiqun(DepartmentofPhysics,SuzbouUniv... 相似文献
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本文基于小挠度薄板弯曲问题的基本解,建立了求解薄板稳定问题的边界积分方程,并计算了若干算例,结果表明用边界元法求解薄板的稳定问题是行之有效的. 相似文献
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用全饱和激光模型对既含有加性又含有倍增噪声的激光场进行理论分析,求出了强度相关时间Tc的数值解和有效本征值λeff的解析解。与实验测量相比较表明,全饱和激光模型与实验吻合得最好,而三次激光模型的偏差较大。 相似文献
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The effects of alternating interaction on the bipartite entanglement are considered in an antiferromagnetic Heisenberg opened
chain. Entropy is used to evaluate bipartite entanglement in the system. There are large oscillations between even and odd
L-values entropy. The even (odd)-values entropy increases when the length of the subsystem increases. The method of density
matrix renormalization-group is applied to obtain logarithmic behavior of entropy. 相似文献
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A numerical method of the adaptive time-dependent density-matrix renormalization-group (t-DMRG) is introduced to calculated one-dimensional quantum spin systems with next-nearest-neighbor interaction. The algorithm to study the local magnetization in spin-1/2 Heisenberg XX chain is checked. The analysis of error indicates that this method is efficient to study the spin-1/2 chain with next-nearest-neighbor interaction. By using of the method, the effects of the next-nearest-neighbor interaction on the dynamics of the local magnetization and entanglement entropy are studied. 相似文献
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本文测定了Cs3Cu2 I5 晶体薄膜在室温及液氮温度下的吸收谱,并依此计算出该材料的激子参数,即激子束缚能ΔE(1)ex = (0.53±0.07)eV,激子半径aex = 0.326 nm ,禁带宽度Eg = (5.00±0.07)eV。在谱分析的基础上,论证了Cs3Cu2I5 的电子和激子激发定域在该晶体的CuI亚晶格之中,同时,揭示了在低温下Csx Cu1- x I系列化合物的第一激子峰位置随其摩尔组分变化的规律。 相似文献
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The time evolution of the entanglement of a pair of two spin qubits is investigated when the two qubits simultaneously couple to an environment of an anisotropic Heisenberg XXZ spin chain. The entanglement of the two spin qubits can be created and is a periodic function of the time if the magnetic field is greater than a critical value. If the two spin qubits are in the Bell state, the entanglement can be stored with relatively large value even when the magnetic field is large. 相似文献
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从单模激光场的增益-噪声模型出发,导出了激光场定态强度分布函数,研究了定态分布函数的极值点随加性噪声、乘性噪声和注入信号的变化情况。结果表明,乘性噪声是使激光系统出现一级相变类比的关键因素,注入信号使相变行为减弱,而加性噪声却使得定态分布中极值点的数量和位置出现来回跳跃式变化。 相似文献
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用含有背散射和饱和效应的双模激光场的理论模型讨论了背散射和外加注入信号对环形激光场的统计性质的影响。结果表明,背散射可以抑制系统的涨落。对于均匀展宽的双向环形激光场,注入信号可以将其中的弱模光场由非相干光驱动成为相干光,而对于非均匀展宽的环形激光场则没有这种驱动效应。进一步研究发现,这种驱动效应与注入信号的强弱及两模式光场的抽运参量差异△α有关。 相似文献