Motivated by recent research achievement of quantum interacting systems in non-equilibrium, we consider a Luttinger model with a suddenly switched-on interaction proposed by Cazalilla [M.A. Cazalilla, Phys. Rev. Lett....Motivated by recent research achievement of quantum interacting systems in non-equilibrium, we consider a Luttinger model with a suddenly switched-on interaction proposed by Cazalilla [M.A. Cazalilla, Phys. Rev. Lett. 97 (2006) 156403]. In order to compare with real systems, we extend Cazalilla's scenario to the spinful system. To find the influence of initial states on the time evolution of some non-equilibrium systems, we mainly focus on the density-density propagator. By comparison and analysis, we discover the different behavior of this non-equilibrium system. Further, it is found that the propagator saves strong memory of initial state, and the effects of right-left interaction cancel out in total density-density propagator.展开更多
The single neutral spin-half particle with electric dipole moment and magnetic dipole moment moving in an external electromagnetic field is studied. The Aharonov-Casher effect and He-McKellar-Wilkens effect are emphat...The single neutral spin-half particle with electric dipole moment and magnetic dipole moment moving in an external electromagnetic field is studied. The Aharonov-Casher effect and He-McKellar-Wilkens effect are emphatically discussed in noncommutative(NC) space with minimal length. The energy eigenvalues of the systems are obtained exactly in terms of the Jacobi polynomials. Additionally, a special case is discussed and the related energy spectra are plotted.展开更多
为了探究半赫斯勒合金CrMnZ的材料与电子性质,预测其用途,采用基于密度泛函理论的第一性原理方法,利用Materials studio 6.0中的CASTEP模块建模,计算了半赫斯勒合金CrMnZ(Z=P,As,Sb)的结构、磁性与半金属性能。通过几何优化得出,CrMnP,C...为了探究半赫斯勒合金CrMnZ的材料与电子性质,预测其用途,采用基于密度泛函理论的第一性原理方法,利用Materials studio 6.0中的CASTEP模块建模,计算了半赫斯勒合金CrMnZ(Z=P,As,Sb)的结构、磁性与半金属性能。通过几何优化得出,CrMnP,CrMnAs和CrMnSb的平衡晶格常数分别为5.53,5.80和6.18Å,平衡状态下能量分别为-13206.9830,-13175.5096和-13089.8696 eV。通过磁矩计算结果和能带图的分析,计算的总磁矩接近于零,并在费米能级附近存在带隙,据此认为CrMnP和CrMnAs合金为半金属反铁磁性材料。Cr原子和Mn原子的磁矩呈反平行排列。通过对态密度图的分析可以得出,半赫斯勒合金CrMnZ的带隙主要来自于Cr-3d和Mn-3d电子的能级劈裂。CrMnP,CrMnAs和CrMnSb分别在5.32~5.67Å,5.37~5.74Å和5.53~5.93Å保持半金属性质。展开更多
基金Supported by the Key Program of the Science Foundation of the Higher Education Institutions of Anhui Province under Grant No.KJ2010A123the Key Program of the Science Foundation of Anhui Agricultural University for Young Teachers and the Talent Foundation of High Education of Anhui Province for Outstanding Youth under Grant No.2010SQRL077ZD
文摘Motivated by recent research achievement of quantum interacting systems in non-equilibrium, we consider a Luttinger model with a suddenly switched-on interaction proposed by Cazalilla [M.A. Cazalilla, Phys. Rev. Lett. 97 (2006) 156403]. In order to compare with real systems, we extend Cazalilla's scenario to the spinful system. To find the influence of initial states on the time evolution of some non-equilibrium systems, we mainly focus on the density-density propagator. By comparison and analysis, we discover the different behavior of this non-equilibrium system. Further, it is found that the propagator saves strong memory of initial state, and the effects of right-left interaction cancel out in total density-density propagator.
基金Supported by the National Natural Science Foundation of China under Grant Nos.11465006 and 11565009
文摘The single neutral spin-half particle with electric dipole moment and magnetic dipole moment moving in an external electromagnetic field is studied. The Aharonov-Casher effect and He-McKellar-Wilkens effect are emphatically discussed in noncommutative(NC) space with minimal length. The energy eigenvalues of the systems are obtained exactly in terms of the Jacobi polynomials. Additionally, a special case is discussed and the related energy spectra are plotted.
文摘为了探究半赫斯勒合金CrMnZ的材料与电子性质,预测其用途,采用基于密度泛函理论的第一性原理方法,利用Materials studio 6.0中的CASTEP模块建模,计算了半赫斯勒合金CrMnZ(Z=P,As,Sb)的结构、磁性与半金属性能。通过几何优化得出,CrMnP,CrMnAs和CrMnSb的平衡晶格常数分别为5.53,5.80和6.18Å,平衡状态下能量分别为-13206.9830,-13175.5096和-13089.8696 eV。通过磁矩计算结果和能带图的分析,计算的总磁矩接近于零,并在费米能级附近存在带隙,据此认为CrMnP和CrMnAs合金为半金属反铁磁性材料。Cr原子和Mn原子的磁矩呈反平行排列。通过对态密度图的分析可以得出,半赫斯勒合金CrMnZ的带隙主要来自于Cr-3d和Mn-3d电子的能级劈裂。CrMnP,CrMnAs和CrMnSb分别在5.32~5.67Å,5.37~5.74Å和5.53~5.93Å保持半金属性质。
