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By using the bosonization and renormalization group methods, we have studied the low energy physical properties in the one-dimensional dimerized Hubbard model. The formation of charge and spin gaps is investigated both for the half-filled electron band and away from the half-filled band. The scaling laws of the charge and spin gaps with the dimerization parameterΔ and the repulsive interaction strength U are obtained. 相似文献
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A new procedure of potential importance sampling method is applied to investigate the phase transition of the (1+1)-dimensional sine-Gordon model. With this method, we obtain the Kosterlitz-Thouless-type phase transition critical value of β^2 ≌ 8π with a relative error as small as 0.4%. 相似文献
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在漫长的历史长河中,与人类社会物质、能量、信息三大主导要素的更替相暗合,人类战争中介系统经历了手足中介、平台中介、信息中介三次革命.如果从13世纪中叶的火药由古代中国经阿拉伯传入欧洲并引发火药化军事革命算起,平台中介战争至今已持续了800年,即使是典型的机械化战争也有100多年的历史.目前的作战指挥控制系统是工业时代的产物,是典型的平台中心战的产物.目前已进入信息时代,如何改造目前的指挥控制系统以适应信息化时代的需要,即如何在由机械化时代转向信息化时代的转型期研制出新一代作战指挥控制系统是本文讨论的重点. 相似文献