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Search Results: 1 - 10 of 82022 matches for " Bang Liu "
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The sublattice magnetizations of the spin-s quantum Heisenberg antiferromagnets
Bang-Gui Liu
Physics , 1999, DOI: 10.1016/S0375-9601(99)00436-3
Abstract: We study the spin-$s$ quantum Heisenberg antiferromagnetic models in a magnon theory free of any unphysical magnon state. Because the unphysical magnon states are completely removed in the magnon Hamiltonians and during the approximation process, we derive spin-s (s>1/2) reliable Neel temperature $T_N$ and reasonable sublattice magnetization unified for $T\leq T_N$.
Robust half-metallic ferromagnetism in the zincblende CrSb
Bang-Gui Liu
Physics , 2002, DOI: 10.1103/PhysRevB.67.172411
Abstract: Using the accurate first-principle method within density-functional theory, we systematically study CrSb in the zincblende (zb) structure. The zb CrSb is predicted of robust half-metallic ferromagnetism (HMFM) with a magnetic moment of 3.000 $\mu_B$ per formula. It is much better than other zb compounds with HMFM because its spin-flip gap reaches 0.774 eV at the equilibrium volume and persists nonzero with its volume changing theoretically from -21% to +60%. It is found there may be a common mechanism for the HMFM in all the zb Cr- and Mn-pnictides. Since being compatible with the III-V semiconductors, this excellent HMFM of the zb CrSb should be useful in spin electronics and other applications.
An Efficient Data Evacuation Strategy for Sensor Networks in Postdisaster Applications
Ming Liu,Bang Liu,Yonggang Wen
International Journal of Distributed Sensor Networks , 2013, DOI: 10.1155/2013/718297


物理学报 , 1980,
Abstract: The Kirchhoff-Fresnel integral equation is transformed into Fourier space and the analytical eigenfunctions, eigenvalus, resonance conditions and far field distributions are obtained. The form of eigenfunctions obtained in the Fourier space are very simple, this result might be used as a convenient start point for further investigation of the unstable optical resonator.
PASS: Parking-Lot-Assisted Carpool over Vehicular Ad Hoc Networks
Jinqi Zhu,Yong Feng,Bang Liu
International Journal of Distributed Sensor Networks , 2013, DOI: 10.1155/2013/491756
A Study on the Tracking Problem in Vehicular Ad Hoc Networks
Xing Zhang,Bang Liu,Jinchuan Tang
International Journal of Distributed Sensor Networks , 2013, DOI: 10.1155/2013/809742
Stable two-dimensional ferromagnets made of regular single-layered lattices of single-molecule nanomagnets on substrates
Rui Zheng,Bang-Gui Liu
Physics , 2009, DOI: 10.1063/1.3212994
Abstract: We propose that stable two-dimensional (2D) ferromagnets can be made of regular single-layered lattices of single-molecule nanomagnets with enough uniaxial magnetic anisotropy on appropriate substrates by controlling the inter-nanomagnet magnetic interaction. Our Monte Carlo simulated results show that such ideal 2D ferromagnets are thermodynamically stable when the anisotropy is strong enough. If the anisotropy energy equals 80 K, approximately that of the Mn12, the T_c varies from zero to 15 K depending on different inter-nanomagnet coupling constants. Such stable spin systems, experimentally accessible, should be promising for information applications.
Infinite coupling magnon theory of quantum Heisenberg magnetic models of spin s
Bang-Gui Liu,Gerd Czycholl
Physics , 1997,
Abstract: An infinity magnon coupling term is introduced into the Holstein-Primakoff transformed forms of the Heisenberg ferromagnetic and antiferromagnetic models of any spin $s$ to rigorously remove the unphysical magnon states. This term makes the series expansion of the square root of the magnon operators become a finite series of magnon operator products. Under a simple Hubbard-like approximation our infinite coupling theory yields much better result than the existing spin wave theories, especially near transition temperatures.
Accurate mapping of quantum Heisenberg magnetic models of spin $s$ on strong-coupling magnon systems
Bang-Gui Liu,Gerd Czycholl
Physics , 1997, DOI: 10.1088/0953-8984/9/25/012
Abstract: An infinite-$U$ term is introduced into the Holstein-Primakoff-transformed magnon hamiltonian of quantum Heisenberg magnetic models of spin $s$. This term removes the unphysical spin wave states on every site and truncates automatically the expansion in powers of the magnon occupation operator. The resultant strong-coupling magnon hamiltonians are accurately equivalent to the original spin hamiltonians. The on-site $U$ levels and their implications are studied. Within a simple decoupling approximation for our strong-coupling magnon models we can easily reproduce the results for the (sublattice) magnetizations obtained previously for the original spin model. But our bosonic hamiltonians without any unphysical states allow for substantially improved values for the spectral weight in the ground state and for lower ground-state energies than those obtained within previous approximations.
Monte Carlo simulated dynamical magnetization of single-chain magnets
Jun Li,Bang-Gui Liu
Physics , 2014, DOI: 10.1016/j.jmmm.2014.11.033
Abstract: Here, a dynamical Monte-Carlo (DMC) method is used to study temperature-dependent dynamical magnetization of famous Mn2Ni system as typical example of single-chain magnets with strong magnetic anisotropy. Simulated magnetization curves are in good agreement with experimental results under typical temperatures and sweeping rates, and simulated coercive fields as functions of temperature are also consistent with experimental curves. Further analysis indicates that the magnetization reversal is determined by both thermal-activated effects and quantum spin tunnelings. These can help explore basic properties and applications of such important magnetic systems.
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