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quantum size-Dependent Third-Order Nonlinear Optical Susceptibility in Semiconductor quantum Dots

Wuhan University Journal of Natural Sciences 2005年第2期10卷 389-392页

作者： SUNTing XIONGGui-guang SchoolofPhysicsandTechnology WuhanUniversityWuhan430072HubeiChina

The density matrix approach has been employed to investigate the opticalnonlinear polarization in a single semiconductor quantum dot(QD). Electron states are considered tobe confined within a quantum dot with infinite potential barriers. It is shown, by numericalcalculation, that the third-order nonlinear optical susceptibilities for a typical Si quantum dot isdependent on the quantum size of the quantum dot and the frequency of incident light.

关键词： cylindric quantum dot nonlinear susceptibility quantum size

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Physiological significance of probability plasticity

Physiological significance of probability plasticity

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中国神经科学学会第四次会员代表大会暨第八届全国学术会议

作者： Jian-Dong YU,Jin-Hui WANG The State Key Laboratory of Brain and Cognitive Science,Institute of Biophysics,Chinese Academy of Sciences

Short-term plasticity in synaptic transmission is believed to control the efficiency of signal communication among the neurons,one of key processes in neural *** better understand the mechanisms underlying synaptic transmission,we conduct paired-recordings between neocortical regular-spiking pyramidal neurons(RS) and a specific subtype of inhibitory interneuron("GIN cells":low threshold-spiking,somatostatin-expressing,EGFP-labeled interneurons in the GIN line of transgenic mice) in brain *** from glutamatergic unitary synapses on pyramidal neurons and GABAergic interneurons are mainly *** both the net amplitude of synchronous release and the amplitude of asynchronous release of each EPSC are *** suggests the quantum size underlying short-term facilitation is not *** contrast,the probabilities of synchronous and asynchronous release of each EPSC are both increased ***,the release probabilities are relative increased when we augment the facilitation by changing the firing frequency of presynaptic *** results indicate the short-term facilitation can be explained by the increasing of release *** examine the role of presynaptic Cal in synaptic release probability and facilitation, we reduced Ca levels by infusing BAPTA(a Ca chelator) into presynaptic *** reduction of presynaptic Ca level significantly blocks synaptic vesicle release,and makes synaptic facilitation *** elevation of presynaptic Ca by adenophostin increases synaptic release probability,but attenuates synaptic *** integrated current pulses mathematically based on different release probability and found that high probability can improve both spike capacity and timing *** conclusion,the elevation of release probability is the main mechanism of short-term facilitation,and it can improve the spike programming.

关键词： short-term plasticity probability plasticity calcium quantum size

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