作者主要研究了质量为 m、自旋为1/2的狄拉克粒子被束缚在长为 L 的盒子内时，考虑到广义测不准关系和相对论效应的情况下，通过求解狄拉克方程得到其本征值和配分函数。研究发现：其本征值与盒子的长度有关；粒子的自由能受其修正项的...作者主要研究了质量为 m、自旋为1/2的狄拉克粒子被束缚在长为 L 的盒子内时，考虑到广义测不准关系和相对论效应的情况下，通过求解狄拉克方程得到其本征值和配分函数。研究发现：其本征值与盒子的长度有关；粒子的自由能受其修正项的影响。同时，得到了狄拉克谐振子基于广义测不准关系的本征值方程，求得其相应的配分函数、自由能和内能熵，结果发现这些热力学量都受广义不确定度常量的影响。展开更多
The Landau problem in Podolsky＇s generalized electrodynamics is studied by the method of diagonalization in noncommutative phase space and we find that the different noncommutative effects for a certain system led by...The Landau problem in Podolsky＇s generalized electrodynamics is studied by the method of diagonalization in noncommutative phase space and we find that the different noncommutative effects for a certain system led by the nonuniqueness of generalized Bopp shift can be avoided. The exact energy eigenvalues are found, and the result shows that the energy spectra are generically non-degenerate, fhrthermore, we obtain the special energy spectra of noncommutative space and commutative space.展开更多
We have discussed the materials of solar cell based on hybrid organic–inorganic halide perovskites with formamidinium(NH_2CH = NH_2^+or FA) lead iodide. Firstly, we build the structure of formamidinium lead iodide(FA...We have discussed the materials of solar cell based on hybrid organic–inorganic halide perovskites with formamidinium(NH_2CH = NH_2^+or FA) lead iodide. Firstly, we build the structure of formamidinium lead iodide(FAPbI_3) by using the material studio. By using the first-principles calculations, the energy band structure, density of states(DOS), and partial DOS(PDOS) of the hydrazine-iodide lead halide are obtained. Then, we theoretically analyze a design scheme for perovskite solar cell materials, published in [Science 354, 861(2016)], with the photoelectric conversion efficiency that can reach 20.3%. Also, we use non-toxic elements to replace lead in FAPbI_3 without affecting its photoelectric conversion efficiency. Here in this work, we explore the energy band structure, lattice constant, light absorption efficiency, etc. After the Ca, Zn, Ge Sr, Sn, and Ta atoms replacing lead(Pb) and through comparing the spectral distributions of the solar spectrum, it can be found that FAGeI_3, FASnI_3, and FAZnI_3 have better absorbance characteristics in the solar spectrum range. If the band gap structure is taken into account, FAGeI_3 will become an ideal material to replace FAPbI_3, although its performance is slightly lower than that of FAPbI_3. The toxicity of Pb is taken into account, and the Ge element can be used as a substitute element for Pb. Furthermore, we explore one of the perovskite materials, i.e., FA0.75Cs_(0.25)Sn_(0.25)Ge_(0.75)I_3 whose photovoltaic properties are close to those of FA_(0.75)Cs_(0.25)Sn_(0.5)Pb_(0.5)I_3, but the former does not contain toxic atoms.Our results pave the way for further investigating the applications of these materials in relevant technologies.展开更多
文摘作者主要研究了质量为 m、自旋为1/2的狄拉克粒子被束缚在长为 L 的盒子内时，考虑到广义测不准关系和相对论效应的情况下，通过求解狄拉克方程得到其本征值和配分函数。研究发现：其本征值与盒子的长度有关；粒子的自由能受其修正项的影响。同时，得到了狄拉克谐振子基于广义测不准关系的本征值方程，求得其相应的配分函数、自由能和内能熵，结果发现这些热力学量都受广义不确定度常量的影响。
基金Supported by the National Natural Science Foundation of China under Grant No 11464005the Guizhou Province Science and Technology Agency Fund under Grant No 20132255the Science Foundation of Guizhou Province Masters under Grant No(2012)61
文摘The Landau problem in Podolsky＇s generalized electrodynamics is studied by the method of diagonalization in noncommutative phase space and we find that the different noncommutative effects for a certain system led by the nonuniqueness of generalized Bopp shift can be avoided. The exact energy eigenvalues are found, and the result shows that the energy spectra are generically non-degenerate, fhrthermore, we obtain the special energy spectra of noncommutative space and commutative space.
基金Project supported by the National Natural Science Foundation of China(Grant No.11164004)the Industrial Research Project of Guizhou Province,China(Grant No.GY[2012]3060)+1 种基金the Project of Education Department of Guizhou Province,China(Grant No.[2016]215)the Special Laboratory Fund of Education Department of Guizhou Province,China(Grant No.GY[2014]217)
文摘We have discussed the materials of solar cell based on hybrid organic–inorganic halide perovskites with formamidinium(NH_2CH = NH_2^+or FA) lead iodide. Firstly, we build the structure of formamidinium lead iodide(FAPbI_3) by using the material studio. By using the first-principles calculations, the energy band structure, density of states(DOS), and partial DOS(PDOS) of the hydrazine-iodide lead halide are obtained. Then, we theoretically analyze a design scheme for perovskite solar cell materials, published in [Science 354, 861(2016)], with the photoelectric conversion efficiency that can reach 20.3%. Also, we use non-toxic elements to replace lead in FAPbI_3 without affecting its photoelectric conversion efficiency. Here in this work, we explore the energy band structure, lattice constant, light absorption efficiency, etc. After the Ca, Zn, Ge Sr, Sn, and Ta atoms replacing lead(Pb) and through comparing the spectral distributions of the solar spectrum, it can be found that FAGeI_3, FASnI_3, and FAZnI_3 have better absorbance characteristics in the solar spectrum range. If the band gap structure is taken into account, FAGeI_3 will become an ideal material to replace FAPbI_3, although its performance is slightly lower than that of FAPbI_3. The toxicity of Pb is taken into account, and the Ge element can be used as a substitute element for Pb. Furthermore, we explore one of the perovskite materials, i.e., FA0.75Cs_(0.25)Sn_(0.25)Ge_(0.75)I_3 whose photovoltaic properties are close to those of FA_(0.75)Cs_(0.25)Sn_(0.5)Pb_(0.5)I_3, but the former does not contain toxic atoms.Our results pave the way for further investigating the applications of these materials in relevant technologies.
