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非平衡态对高温超导体光场致发射的影响
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作者 张连俊 彭荣群 罗恩泽 《低温与超导》 CAS CSCD 北大核心 2003年第2期46-48,共3页
由于外加电场的作用 ,高温超导体材料体内电子平衡态的化学势偏移导致出现非平衡状态 ,这种非平衡状态将影响高温超导体光场致发射的性质。文中对高温超导体的光场致发射受非平衡态的影响进行了研究。
关键词 平衡态 高温超导体 光场致发射 电子平衡态 电子能态
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反向导引磁场自由电子激光中平衡态电子相轨道 被引量:1
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作者 徐勇 张世昌 《物理学报》 SCIE EI CAS CSCD 北大核心 1994年第7期1096-1104,共9页
考虑电子束自身场情况下,给出了反向导引磁场自由电子激光中平衡态电子运动的一种正则描述。证明了在可积极限下,不动点附近相轨道的稳定性;并采用美国麻省理工学院的反向导引场自由电子激光实验参数,计算了不同束流强度下的Poi... 考虑电子束自身场情况下,给出了反向导引磁场自由电子激光中平衡态电子运动的一种正则描述。证明了在可积极限下,不动点附近相轨道的稳定性;并采用美国麻省理工学院的反向导引场自由电子激光实验参数,计算了不同束流强度下的Poincare截面。结果表明,即使自身场相当强(束流强度达到6000A),平衡态电子的相轨道仍保持其规则性,相空间没有出现混沌,这说明在自由电子激光器中,利用反向导引磁场可以获得比传统的采用正向导引磁场更好的电子束质量,从而改善器件的输出性能。 展开更多
关键词 自由电子激光 平衡态电子 相轨道
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Quantum Measurement of Single Electron State by a Mesoscopic Detector
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作者 胡学宁 骆钧炎 李新奇 《Journal of Semiconductors》 EI CAS CSCD 北大核心 2006年第2期218-222,共5页
A realistic measurement setup for a system such system measured by a mesoscopie detector,is theoretically as a charged two-state (qubit) or multi-state quantum studied. To properly describe the measurement-induced b... A realistic measurement setup for a system such system measured by a mesoscopie detector,is theoretically as a charged two-state (qubit) or multi-state quantum studied. To properly describe the measurement-induced back-action,a detailed-balance preserved quantum master equation treatment is developed. The established framework is applicable for arbitrary voltages and temperatures. 展开更多
关键词 quantum measurement detailed balance RELAXATION
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高性能时间分辨角分辨光电子能谱在量子材料中的研究进展
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作者 段绍峰 李义典 +1 位作者 杨乐仙 张文涛 《中国科学:物理学、力学、天文学》 CSCD 北大核心 2023年第6期207-220,共14页
通过飞秒激光激发固体材料,利用材料中不同自由度的响应时间尺度研究多体相互作用、追踪超快相变过程、实现光诱导新物态或隐藏态等,这是凝聚态物理研究的前沿和重要探索方向.时间分辨角分辨光电子能谱是近十多年发展起来的研究量子材... 通过飞秒激光激发固体材料,利用材料中不同自由度的响应时间尺度研究多体相互作用、追踪超快相变过程、实现光诱导新物态或隐藏态等,这是凝聚态物理研究的前沿和重要探索方向.时间分辨角分辨光电子能谱是近十多年发展起来的研究量子材料在飞秒激光激发后超快电子结构动力学的关键实验手段.本文回顾了基于非线性光学晶体和高阶倍频的时间分辨角分辨光电子能谱的基本原理和组成,以及利用其对量子材料的超快电子结构动力学进行的研究.主要包括四个方面的研究进展:(1)量子材料的非占据电子态探测;(2)光诱导的超快电子结构相变;(3)关联电子材料中电声相互作用强度确定;(4)光致新物态.最后,讨论了时间分辨角分辨光电子能谱未来可能的发展方向. 展开更多
关键词 时间分辨角分辨光电子能谱 非线性光学晶体 平衡态电子动力学 量子材料 超快相变
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Oxidation of a Zr_(46)Cu_(46)Al_(7)Gd_(1)bulk metallic glass detected via optical characterizations
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作者 Weijie Xie Mingxing Li +4 位作者 Jiashu Cao Liwei Hu Chao Wang Wei-Hua Wang Yanhui Liu 《Science China Materials》 SCIE EI CAS CSCD 2021年第4期973-978,共6页
Oxidation of metallic glasses has been shown to be different from crystalline alloys due to the disordered atomic structures and far-from-equilibrium state,and quick characterization is required to reveal their early ... Oxidation of metallic glasses has been shown to be different from crystalline alloys due to the disordered atomic structures and far-from-equilibrium state,and quick characterization is required to reveal their early stage oxidation.In this study,we investigated the oxidation behavior of a Zr_(46)Cu_(46)Al_(7)Gd_(1)bulk metallic glass by measuring the changes of optical constants via spectroscopic ellipsometry.Characterizations with X-ray diffraction,scanning electron microscopy,and thermogravimetric analyzer confirmed that the changes of pseudo-optical constants reflected not only the onset temperature at which the alloys underwent obvious oxidation,but also the subtle oxidation which was tedious to characterize.Our study suggests a more efficient and accurate approach to understand the oxidation of metallic glasses with temperature,time and compositions. 展开更多
关键词 metallic glasses spectroscopic ellipsometry OXIDATION
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Theoretical Study on the Low-Lying Electronic States of He_2,He_2^+,and He_2^(++)
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作者 张云光 查新未 高涛 《Communications in Theoretical Physics》 SCIE CAS CSCD 2012年第6期1048-1052,共5页
The equilibrium geometries, potential energy curves, spectroscopic dissociation energies of the ground and low-lying electronic states of He2, He2^+ and He2^++ are calculated using symmetry adapted cluster/symmetry... The equilibrium geometries, potential energy curves, spectroscopic dissociation energies of the ground and low-lying electronic states of He2, He2^+ and He2^++ are calculated using symmetry adapted cluster/symmetry adapted cluster-configuration interaction (SAC/SAC-CI) method with the basis sets CC-PV5Z. The corresponding dissociation limits for all states are derived based on atomic and molecular reaction statics. The analytical potential energy functions of these states are fitted with Murrell-Sorbie potential energy function from our calculation results. The spectroscopic constants Be, αe, ωe, and ωeχe of these states are calculated through the relationship between spectroscopic data and analytical energy function, which are in well agreement with the experimental data. In addition, the origin of the energy barrier in the ground state X^I∑9^+ of He2^++ energy curve are explained using the avoided crossing rules of valence bond model. 展开更多
关键词 potential energy curve spectroscopic data Murrell-Sorbie function
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