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Analytic calculation of high-order corrections to quantum phase transitions of ultracold Bose gases in bipartite superlattices 被引量:1
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作者 Zhi Lin Wanli Liu 《Frontiers of physics》 SCIE CSCD 2018年第5期133-140,共8页
We clarify some technical issues in the present generalized effective-potential Landau theory (GEPLT) to make the GEPLT more consistent and complete. Utilizing this clarified GEPLT, we analytically study the quantum... We clarify some technical issues in the present generalized effective-potential Landau theory (GEPLT) to make the GEPLT more consistent and complete. Utilizing this clarified GEPLT, we analytically study the quantum phase transitions of ultracold Bose gases in bipartite superlattices at zero temper- ature. The corresponding quantum phase boundaries are analytically calculated up to the third-order hopping, which are in excellent agreement with the quantum Monte Carlo (QMC) simulations. 展开更多
关键词 ultracold Bose gases quantum phase transition bipartite superlattice generalizedeffective-potential landau theory
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MECHANICAL MODELING OF THE BISTABLE BACTERIAL FLAGELLAR FILAMENT 被引量:1
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作者 Xiaoling Wang 1 Qingping Sun 2 1 ( 1 School of Mechanical Engineering, University of Science & Technology Beijing, Beijing 100083, China) ( 2 Department of Mechanical Engineering, The Hong Kong University of Science & Technology, Clear Water Bay, Kowloon, Hong Kong, China) 《Acta Mechanica Solida Sinica》 SCIE EI 2011年第S1期1-16,共16页
We extend the 2D Landau phase transition theory to the bacterial flagellar filament which displays the phase transition between the left handed normal form and the right handed semi-coiled form. The bacterial flagella... We extend the 2D Landau phase transition theory to the bacterial flagellar filament which displays the phase transition between the left handed normal form and the right handed semi-coiled form. The bacterial flagellar filament is treated as an elastic thin rod based on the Kirchhoff’s thin rod theory. Mechanical analysis is performed on the periodical phase transition of the filament between the two helical structures of the opposite charity. The curvature and twist are chosen as the order parameters in constructing the phase transition model of the filament. The established model is applied to study the instability properties of the filament and to investigate the loading and deformation conditions of the phase transition. In addition, the curvature and twist gradient energy are considered to describe the interface properties of the two phases. 展开更多
关键词 bacterial flagellar filament landau theory the Kirchhoff’s rod theory INSTABILITY
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Rearrangements of interacting Fermi liquids
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作者 杨荣瑶 蒋维洲 《Chinese Physics C》 SCIE CAS CSCD 2014年第10期28-33,共6页
The stability condition of the Landau Fermi liquid theory may be broken when the interaction between particles is strong enough. In this case, the ground state is reconstructed to have a particle distribution differen... The stability condition of the Landau Fermi liquid theory may be broken when the interaction between particles is strong enough. In this case, the ground state is reconstructed to have a particle distribution different from the Fermi-step function. For specific instances, one case with the vector boson exchange and another with the relativistic heavy-ion collision are taken into consideration. With the vector boson exchange, we find that the relative weak interaction strength can lead to the ground-state rearrangement as long as the fermion mass is large enough. It is found that the relativistic heavy-ion collision may also cause the ground-state rearrangement, affecting the statistics of the collision system. 展开更多
关键词 landau Fermi liquid theory ground-state instability relativistic heavy-ion collisions vector bosons
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