On the basis of a generalized SSH model, an organic polymer ferromagnet theory is proposed at the finite temperature in the self-consistent mean field approximation, and the specific heat and charge density of the qua...On the basis of a generalized SSH model, an organic polymer ferromagnet theory is proposed at the finite temperature in the self-consistent mean field approximation, and the specific heat and charge density of the quasione-dimensional interehain coupling organic ferromagnets are presented. We find that an obvious feature is to present itself the round peak for the specific heat with the temperature. This indicates unambiguously the presence of the phase transition in the system. The transition temperature plays down with increasing of the interchain coupling t2 or decreasing of the electron repulsion u. The curves of charge density with the temperature debase monotonously. This result illustrates that the higher the temperature is, the more electrons are excited.展开更多
The gain-noise model of a single-mode laser driven by correlated additive and multiplicative white noises is investigated theoretically.The analytical expressions of the time-dependent moments and correlation function...The gain-noise model of a single-mode laser driven by correlated additive and multiplicative white noises is investigated theoretically.The analytical expressions of the time-dependent moments and correlation function of the laser intensity are derived by means of linear approximation method.Some novel phenomena are found.In certain cases,instead of monotonic evolution,the evolution curves of the intensity correlation function versus time exhibit the negative minimum value,whereas a peak for the evolution of the normalized variance of the laser intensity with time emerges.展开更多
基金National Natural Science Foundation of China under Grant Nos.10574047 and 20490210
文摘On the basis of a generalized SSH model, an organic polymer ferromagnet theory is proposed at the finite temperature in the self-consistent mean field approximation, and the specific heat and charge density of the quasione-dimensional interehain coupling organic ferromagnets are presented. We find that an obvious feature is to present itself the round peak for the specific heat with the temperature. This indicates unambiguously the presence of the phase transition in the system. The transition temperature plays down with increasing of the interchain coupling t2 or decreasing of the electron repulsion u. The curves of charge density with the temperature debase monotonously. This result illustrates that the higher the temperature is, the more electrons are excited.
文摘The gain-noise model of a single-mode laser driven by correlated additive and multiplicative white noises is investigated theoretically.The analytical expressions of the time-dependent moments and correlation function of the laser intensity are derived by means of linear approximation method.Some novel phenomena are found.In certain cases,instead of monotonic evolution,the evolution curves of the intensity correlation function versus time exhibit the negative minimum value,whereas a peak for the evolution of the normalized variance of the laser intensity with time emerges.
