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纳米ZnO在高压下的性质与结构研究   总被引:3,自引:1,他引:2       下载免费PDF全文
 在金刚石压砧上测量了20 nm的ZnO和体相粉末ZnO的电阻-压力关系。研究结果表明,20 nm的ZnO在7.9 GPa 压力时出现了相变,而体相粉末ZnO在5 GPa 时有相变发生。虽然粒径小的相变压力大于粒径大的,但与以前关于体相粉末ZnO所报道的文献结果有所不同。文中对此作了解释,并对纳米ZnO在压力下的畴破裂进行了研究。  相似文献
2.
以小搏大--生物医药学中的纳米科技   总被引:1,自引:0,他引:1  
武振羽  樊海明  曹立  付立民  李前树  邹炳锁 《物理》2002,31(10):635-641
文章对国内外纳米技术在生物、医学上应用的最新进展做了评述,所涉及的领域包括磁性纳米粒子标记、发光量子点与胶珠标记、微流体测量、药物体测量、药物传递与辅助治疗、生物分子或DNA的标记与测量,并对未来的发展提出了自己的看法。  相似文献
3.
We study the interaction between a single-mode quantized field and a quantum system composed of two qubits. We suppose that two qubits initially be prepared in the mixed and separable state, and study how entanglement between two qubits arises in the course of evolution according to the Jaynes-Cummings type interaction with nonclassical radiation field. We also investigate the relation between entanglement and purity of qubit subsystem. We show that different photon statistics have different effects on the dynamical behavior of the qubit subsystem. When the qubits are initially prepared in the maximally mixed and separable state, for coherent state field we cannot find entanglement between two qubits; for squeezed state field entanglement between two qubits exists in several short period of time; for even and odd coherent state fields of large photon number, the dynamical behavior of the entanglement between two qubits shows collapse and revival phenomenon. For odd coherent state field of small photon number, the entanglement with both qubits initially prepared in maximally mixed state can be stronger than that with both qubits initially prepared in pure states. For fields of small photon number, the entanglement strongly depends on the states they are initially prepared in. For coherent state field, and odd and even coherent state fields of large photon number, the entanglement only depends on the purity of the initial state of qubit subsystem. We also show that during the evolution the unentangled state may be purer than the entangled state, and the maximum degree of entanglement may not occur at the time when the qubit subsystem is in the purist state.  相似文献
4.
We study the interaction between a single-mode quantized field and a quantum system composed of two qubits. We suppose that two qubits initially be prepared in the mixed and separable state, and study how entanglement between two qubits arises in the course of evolution according to the Jaynes-Cummings type interaction with nonclassical radiation field. We also investigate the relation between entanglement and purity of qubit subsystem. We show that different photon statistics have different effects on the dynamical behavior of the qubit subsystem. When the qubits are initially prepared in the maximally mixed and separable state, for coherent state field we cannot find entanglement between two qubits; for squeezed state field entanglement between two qubits exists in several short period of time; for even and odd coherent state fields of large photon number, the dynamical behavior of the entanglement between two qubits shows collapse and revival phenomenon. For odd coherent state field of small photon number, the entanglement with both qubits initially prepared in maximally mixed state can be stronger than that with both qubits initially prepared in pure states. For fields of small photon number, the entanglement strongly depends on the states they are initially prepared in. For coherent state field, and odd and even coherent state fields of large photon number, the entanglement only depends on the purity of the initial state of qubit subsystem. We also show that during the evolution the unentangled state may be purer than the entangled state, and the maximum degree of entanglement may not occur at the time when the qubit subsystem is in the purist state.  相似文献
5.
张剑  邵彬  邹健  李前树 《中国物理 B》2011,20(10):100307-100307
We study the state transfer of Bell states in a general XY spin chain using the Dzyaloshinsky-Moriya interaction. Two symmetries of fidelity with the anisotropy parameter are found. The maximum fidelity is shown to be significantly enhanced in cases of an odd number of sites. Enhancement of fidelity on a singlet state is greater than that on the other Bell states in such cases.  相似文献
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