共查询到20条相似文献,搜索用时 64 毫秒
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从粒子密度和粒子流密度出发,分析了几类相关的算符,讨论了它们的性质与相互关系;从具体的物理意义出发,明确了合适的粒子密度算符和粒子流密度算符的表达形式. 相似文献
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本引入谐振子产生算符和湮没算符的逆算符,导出它们在Fock空间的表达式,并给出了一些简单应用。 相似文献
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针对<大学物理>2008年第8期上关于粒子概率密度算符和概率流密度算符的讨论一文进行了补充,对一般空间(如动量空间)中的概率和概率流进行了较系统的阐述,并纠正了该文中的有关错误论断. 相似文献
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本文利用一维谐振子的升降算符合出了计算动量算任意次幂P^k的矩阵元及平均值通式,并建立了与坐标算符矩阵元的转换关系。 相似文献
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使用HGTF作为基函数,导出了单电子电场积分,单电子电场梯度积分等单电子算符积分的解析表示式。 相似文献
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Zitterbewegung (ZB, trembling motion) of electrons in semiconductor carbon nanotubes is described taking into account dephasing processes. The density matrix formalism is used for the theory. Differences between decay of ZB oscillations due to electron localization and that due to dephasing are discussed. 相似文献
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We show that Bogoliubov's quasiparticle in superfluid 3He-B undergoes the Zitterbewegung, as a free relativistic Dirac's electron does. The expectation value of position, as well as spin, of the quasiparticle is obtained and compared with that of the Dirac's electron. In particular, the Zitterbewegung of Bogoliubov's quasiparticle has a frequency approximately 105 lower than that of an electron, rendering a more promising experimental observation. 相似文献
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B. G. Sidharth 《International Journal of Theoretical Physics》2009,48(2):497-506
The Dirac wave equation for the electron soon lead to the recognition of the Zitterbewegung. This was studied both by Schrodinger
and Dirac. Later there were further elegant and sometimes dissenting insights, from different authors. We briefly review some
of these developments. However in more recent times with dark energy and noncommutative spacetime coming to centre stage,
the earlier studies of Zitterbewegung become questionable. 相似文献
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Berry phases mix states of positive and negative energy in the propagation of fermions and bosons in external gravitational and electromagnetic fields and generate Zitterbewegung oscillations. The results are valid in any reference frame and to any order of approximation in the metric deviation. 相似文献
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We address velocity-modulation control of electron wave propagation in a normal/ferromagnetic/normal silicene junc tion with local variation of Fermi velocity, where the properties of charge, valley, and spin transport through the junction ar investigated. By matching the wavefunctions at the normal-ferromagnetic interfaces, it is demonstrated that the variation of Fermi velocity in a small range can largely enhance the total conductance while keeping the current nearly fully valley and spin-polarized. Further, the variation of Fermi velocity in ferromagnetic silicene has significant influence on the valley and spin polarization, especially in the low-energy regime. It may drastically reduce the high polarizations, which can b realized by adjusting the local application of a gate voltage and exchange field on the junction. 相似文献
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《Physics letters. A》2020,384(19):126403
Artificial spin-orbit coupling has been successfully implemented in many atomic experiments by so-called Raman addressing, and various interesting phenomena have already been investigated in such spin-orbit-coupled atomic systems. In this paper, we study spin-orbit-coupled Bose-Einstein condensates addressed by spatially localized Raman lasers. The localized Raman coupling effectively generates a spatial inhomogeneous spin-orbit coupling. The ground states of this system are spatially confined into the localization region. We excite Zitterbewegung dynamics by an experimentally realizable quench. By making advantage of Zitterbewegung, we propose to implement an atomic device to control over atoms. 相似文献
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Revivals of Zitterbewegung in the Bernevig Hughes Zhang model in the quantum spin Hall regime with a laser pulse 下载免费PDF全文
We theoretically investigate the Zitterbewegung (ZB) behavior of electrons in the Bernevig-Hughes-Zhang model with a short laser pulse. To obtain a steady picture, we fix the electron on the Landau levels with a magnetic field. The ZB motion and the electromagnetic radiations in the quantum spin Hall regime are given. We find that over a shorter time, the electromagnetic radiations show a quasi-classical cyclotron oscillation, while over a longer time, they exhibit a clear revival picture. The resulting revival time and excited electric field are large enough to make experimental detection accessible. 相似文献
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Within an unprecedented analytical formulation, we find an approximate relationship for the ultrarelativistic velocity of electrons in the presence of a weak, time-independent and uniform magnetic field acting perpendicularly to the trajectory of the electrons. We also determine the corresponding velocity quantum operator whose eigenvalues are also determined as well as their corresponding Landau states. In addition, the corresponding synchrotron radiation losses are calculated. 相似文献