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Search Results: 1 - 10 of 140064 matches for " ZHANG Hai-jun "
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Scaling Transformation for Nonlocal Interactions  [PDF]
Hai-Jun Wang
Journal of Modern Physics (JMP) , 2015, DOI: 10.4236/jmp.2015.65073
Abstract: In the light of their relationships with renormalization, in this paper we associate the scaling transformation with nonlocal interactions. On one hand, the association leads us to interpret the nonlocality with locally symmetric method. On the other hand, we find that the nonlocal interaction between hadrons could be test ground for scaling transformation if ascribing the running effects in renormalization to scaling transformation. The nonlocal interaction Lagrangian turns out to vary under scaling transformation, analogous to running cases in renormalization. And the total Lagrangian becomes scale invariant only under some extreme conditions. The conservation law of this extreme Lagrangian is discussed and a contribution named scalum appears to the spin angular momentum. Finally a mechanism is designed to test the scaling effect on nonlocal interaction.
Quantum Anomalous Hall Effect in Magnetic Topological Insulator GdBiTe3
Hai-Jun Zhang,Xiao Zhang,Shou-Cheng Zhang
Physics , 2011,
Abstract: The quantum anomalous Hall (QAH) state is a two-dimensional bulk insulator with a non-zero Chern number in absence of external magnetic fields. Protected gapless chiral edge states enable dissipationless current transport in electronic devices. Doping topological insulators with random magnetic impurities could realize the QAH state, but magnetic order is difficult to establish experimentally in the bulk insulating limit. Here we predict that the single quintuple layer of GdBiTe3 film could be a stoichiometric QAH insulator based on ab-initio calculations, which explicitly demonstrate ferromagnetic order and chiral edge states inside the bulk gap. We further investigate the topological quantum phase transition by tuning the lattice constant and interactions. A simple low-energy effective model is presented to capture the salient physical feature of this topological material.
5-(2-Chlorophenoxy)-1,3-dimethyl-1H-pyrazole-4-carbaldehyde oxime
Hai-Jun Zhang,Chong-Guang Fan,Lei Shi
Acta Crystallographica Section E , 2012, DOI: 10.1107/s1600536812026530
Abstract: In the title molecule, C12H12ClN3O2, the benzene and pyrazole rings are inclined to each other at a dihedral angle of 83.3 (3)°. In the crystal, molecules are linked into [010] chains via O—H...N hydrogen bonds with the unsubstituted pyrazole N atom acting as the acceptor.
Enhanced Orbital Degeneracy in Momentum Space for LaOFeAs
Hai-Jun Zhang,Gang Xu,Xi Dai,Zhong Fang
Physics , 2008, DOI: 10.1088/0256-307X/26/1/017401
Abstract: The Fermi surfaces (FS) of LaOFeAs (in $k_z$=0 plane) consist of two hole-type circles around $\Gamma$ point, which do not touch each other, and two electron-type co-centered ellipses around M point, which are degenerate along the M-X line. By first-principles calculations, here we show that additional degeneracy exists for the two electron-type FS, and the crucial role of F-doping and pressure is to enhance this orbital degeneracy. It is suggested that the inter-orbital fluctuation is the key point to understand the unconventional superconductivity in these materials.
Investigation of Magnetic Transport Properties by Wannier Interpolation
Yi Liu,Hai-Jun Zhang,Yugui Yao
Physics , 2010, DOI: 10.1103/PhysRevB.79.245123
Abstract: We present an efficient {\it ab initio} approach for the study of magnetic transport properties based on the Boltzmann equation with the Wannier interpolation scheme. Within the relaxation time approximation, band-resolved electric conductivity under a finite magnetic field is obtained and the historical motion of the electron wave packet in reciprocal space is determined. As a typical application of this method, we have calculated the electric conductivities of MgB$_2$ under finite magnetic fields. Multiband characters for the individual bands are revealed, and the field dependence of the conductivity tensor is studied systematically with the field orientated parallel and normal to the $c$-axis, respectively. The obtained historical motion is employed to simulate directly the cyclotron motion in the extremal orbit and determine the corresponding effective mass. Moreover, This approach is further exploited to calculate the Hall coefficient in the low-field limit, without the complicated computation for the second ${\mathbf k}$ derivative of the band.
Ethyl 2-(3-chloro-2-pyridyl)-5-oxopyrazolidine-3-carboxylate
Hai-Jun Tan,Hai-Bing He,Ming Xia,Xiang-Ning Zhang
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809020789
Abstract: In the molecule of the title compound, C11H12ClN3O3, the five membered ring adopts an envelope conformation. In the crystal structure, intermolecular N—H...O hydrogen bonds link the molecules into centrosymmetric dimers.
1,3-Dimethyl-5-(3-methylphenoxy)-1H-pyrazole-4-carbaldehyde
Hong Dai,Hai-Jun Zhang,Lei Shi,Hai-Qin Sun
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811050926
Abstract: There are two independent molecules in the asymmetric unit of the title compound, C13H14N2O2, in which the dihedral angles between the substituted phenyl ring and the pyrazole ring are 86.5 (2) and 82.3 (3)°. The crystal packing features weak intermolecular C—H...O interactions.
First Principles Studies on 3-Dimentional Strong Topological Insulators: Bi2Te3, Bi2Se3 and Sb2Te3
Wei Zhang,Rui Yu,Hai-Jun Zhang,Xi Dai,Zhong Fang
Physics , 2010, DOI: 10.1088/1367-2630/12/6/065013
Abstract: Bi2Se3, Bi2Te3 and Sb2Te3 compounds are recently predicted to be 3-dimentional (3D) strong topological insulators. In this paper, based on ab-initio calculations, we study in detail the topological nature and the surface states of this family compounds. The penetration depth and the spin-resolved Fermi surfaces of the surface states will be analyzed. We will also present an procedure, from which highly accurate effective Hamiltonian can be constructed, based on projected atomic Wannier functions (which keep the symmetries of the systems). Such Hamiltonian can be used to study the semi-infinite systems or slab type supercells efficiently. Finally, we discuss the 3D topological phase transition in Sb2(Te1-xSex)3 alloy system.
Topological superconductivity and Majorana fermions in half-metal / superconductor heterostructure
Suk Bum Chung,Hai-Jun Zhang,Xiao-Liang Qi,Shou-Cheng Zhang
Physics , 2010, DOI: 10.1103/PhysRevB.84.060510
Abstract: As a half-metal is spin-polarized at its Fermi level by definition, it was conventionally thought to have little proximity effect to an s-wave superconductor. Here we show that, with interface spin-orbit coupling, $p_x +ip_y$ superconductivity without spin degeneracy is induced on the half-metal, and we give an estimate of its bulk energy gap. Therefore a single-band half-metal can give us a topological superconductor with a single chiral Majorana edge state. Our band calculation shows that two atomic layers of VTe or CrO$_2$ is a single-band half-metal for a wide range ($\sim$0.1eV) of Fermi energy and thus is a suitable candidate material.
Enhanced Orbital Degeneracy in Momentum Space for LaOFeAs

ZHANG Hai-Jun,XU Gang,DAI Xi,FANG Zhong,

中国物理快报 , 2009,
Abstract:
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