In the lattice system,when the synthetic flux reaches aπphase along a closed loop under the synthetic gauge field,destructive interference occurs and gives rise to the localization phenomenon.This is known as the Aha...In the lattice system,when the synthetic flux reaches aπphase along a closed loop under the synthetic gauge field,destructive interference occurs and gives rise to the localization phenomenon.This is known as the Aharonov-Bohm(AB)caging effect.It provides a powerful tool for the study of quantum transport and dynamical effects.In the system where lattice sites possess internal structure and the underlying gauge field is non-Abelian,localization can also occur,forming the non-Abelian AB caging.Here,we propose an experimental scheme to synthesize non-Abelian gauge fields with a single trapped ion by coupling multiple internal levels and Fock states in its motion via laser fields.In contrast to the Abelian AB caging,we numerically observe that the non-Abelian AB caging occurs either when the interference matrix is nilpotent,or when the initial state is specifically set.Our experimental scheme broadens the study of localization phenomena and provides a novel tool for the study of non-Abelian physics.展开更多
The energy loss, produced by shielding effect of steel cage outside the source tube, is quite considerable. With PENELOPE software package, MC results have been obtained based on the simulation of different source con...The energy loss, produced by shielding effect of steel cage outside the source tube, is quite considerable. With PENELOPE software package, MC results have been obtained based on the simulation of different source con- formations. The result illustrates that the naked source tubes can improve the utilization ratio of the cobalt facilities. It demonstrates the applied value of the naked source tube in engineering.展开更多
An inclusion complex of cyclic bis(zinc porphyrin) 1 with 5,15-dipyridylporphyrin derivative 3 has been designed and constructed. The complex formation is induced by Zn-N coordination, and is robust (Kassoc ~ 106 L/mo...An inclusion complex of cyclic bis(zinc porphyrin) 1 with 5,15-dipyridylporphyrin derivative 3 has been designed and constructed. The complex formation is induced by Zn-N coordination, and is robust (Kassoc ~ 106 L/mol) due to the presence of the cage effect of cyclic bis(zinc porphyrin). The cage-like complex as an entity is stable enough, and also convenient to achieve relative movement between the bis(zinc porphyrin) host and the dipyridylporphyrin vip connected by Zn-N coordination. The characteristics of these assemblies have been demonstrated by 1 H NMR, UV-vis, and fluorescence spectra. The results show its potential applications as a molecular gyroscope in molecular machines.展开更多
锂硫电池由于其高理论比容量而备受瞩目,然而其商业化进程仍受到中间产物的穿梭效应、硫的绝缘性和正极体积膨胀等一系列问题的阻碍.为了有效抑制穿梭效应,通过水热法合成了一种以钴和镍为主体的笼状中空双金属硫化物(Ni_(3-x)Co_(x)S_(...锂硫电池由于其高理论比容量而备受瞩目,然而其商业化进程仍受到中间产物的穿梭效应、硫的绝缘性和正极体积膨胀等一系列问题的阻碍.为了有效抑制穿梭效应,通过水热法合成了一种以钴和镍为主体的笼状中空双金属硫化物(Ni_(3-x)Co_(x)S_(4)),并将其作为隔膜部分组装到Li-S电池中.其中空结构的特点为氧化还原反应提供了足够的活性位点,进而可以达到更大的比容量,本工作发现,采用最佳比例(2∶1)的笼状Ni_(3-x)Co_(x)S_(4)材料能够通过物理吸附和化学固定促进多硫化物的转化,有效限制多硫化物的穿梭,提高电导率,并促进锂离子的扩散.实验结果显示,笼状Ni_(3-x)Co_(x)S_(4)材料表现出优异的性能,包括在0.1 C下达到1184.3 mAh g^(-1)的初始容量以及在0.2 C循环200圈后仍保持564.4 mAh g^(-1)的比容量.展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.92165206,12275090,and 12304554)the Innovation Program for Quantum Science and Technology(Grant Nos.2021ZD0301603 and 2021ZD0302303)。
文摘In the lattice system,when the synthetic flux reaches aπphase along a closed loop under the synthetic gauge field,destructive interference occurs and gives rise to the localization phenomenon.This is known as the Aharonov-Bohm(AB)caging effect.It provides a powerful tool for the study of quantum transport and dynamical effects.In the system where lattice sites possess internal structure and the underlying gauge field is non-Abelian,localization can also occur,forming the non-Abelian AB caging.Here,we propose an experimental scheme to synthesize non-Abelian gauge fields with a single trapped ion by coupling multiple internal levels and Fock states in its motion via laser fields.In contrast to the Abelian AB caging,we numerically observe that the non-Abelian AB caging occurs either when the interference matrix is nilpotent,or when the initial state is specifically set.Our experimental scheme broadens the study of localization phenomena and provides a novel tool for the study of non-Abelian physics.
文摘The energy loss, produced by shielding effect of steel cage outside the source tube, is quite considerable. With PENELOPE software package, MC results have been obtained based on the simulation of different source con- formations. The result illustrates that the naked source tubes can improve the utilization ratio of the cobalt facilities. It demonstrates the applied value of the naked source tube in engineering.
基金Supported by the 973 Program (Grant No. 2006CB932900)National Natural Science Foundation of China (Grant Nos. 20802038 and 20721062)Tianjin Natural Science Foundation (Grant No. 07QTPTJC29700).
文摘An inclusion complex of cyclic bis(zinc porphyrin) 1 with 5,15-dipyridylporphyrin derivative 3 has been designed and constructed. The complex formation is induced by Zn-N coordination, and is robust (Kassoc ~ 106 L/mol) due to the presence of the cage effect of cyclic bis(zinc porphyrin). The cage-like complex as an entity is stable enough, and also convenient to achieve relative movement between the bis(zinc porphyrin) host and the dipyridylporphyrin vip connected by Zn-N coordination. The characteristics of these assemblies have been demonstrated by 1 H NMR, UV-vis, and fluorescence spectra. The results show its potential applications as a molecular gyroscope in molecular machines.
文摘锂硫电池由于其高理论比容量而备受瞩目,然而其商业化进程仍受到中间产物的穿梭效应、硫的绝缘性和正极体积膨胀等一系列问题的阻碍.为了有效抑制穿梭效应,通过水热法合成了一种以钴和镍为主体的笼状中空双金属硫化物(Ni_(3-x)Co_(x)S_(4)),并将其作为隔膜部分组装到Li-S电池中.其中空结构的特点为氧化还原反应提供了足够的活性位点,进而可以达到更大的比容量,本工作发现,采用最佳比例(2∶1)的笼状Ni_(3-x)Co_(x)S_(4)材料能够通过物理吸附和化学固定促进多硫化物的转化,有效限制多硫化物的穿梭,提高电导率,并促进锂离子的扩散.实验结果显示,笼状Ni_(3-x)Co_(x)S_(4)材料表现出优异的性能,包括在0.1 C下达到1184.3 mAh g^(-1)的初始容量以及在0.2 C循环200圈后仍保持564.4 mAh g^(-1)的比容量.
