 作 者: ( "xiancong lu" OR "xiancong lu" )

Physical Review B (IF 3.908) Pub Date : 20220621 ,DOI:10.1103/physrevb.105.245127Xiancong Lu, D. SénéchalWe study the twisted Hubbard model of a cuprate bilayer at a fixed twist angle θ=53.13∘ and as a function of doping, using the variational cluster approximation, a method that treats shortrange dynamical correlations exactly. At intermediate interlayer tunneling, we observe a sudden change of the relative sign of the dwave order parameters of two layers between the underdoped and overdoped regimes ...

Physical Chemistry Chemical Physics (IF 3.945) Pub Date : 20220504 ,DOI:10.1039/d2cp01390hLijin Zhan, Yimei Fang, Ruotong Zhang, Xiancong Lu, Tieyu Lü, Xinrui Cao, Zizhong Zhu, Shunqing WuSilicene, a competitive twodimensional (2D) material for future electronic devices, has attracted intensive attention in condensed matter physics. Utilizing an adaptive genetic algorithm (AGA), we identify a topological allotrope of silicene, named tilted penta (tPenta) silicene. Based on firstprinciples calculations, the geometric and electronic properties of tPenta silicene and its isoelectronic ...

Physical Review B (IF 3.908) Pub Date : 20220214 ,DOI:10.1103/physrevb.105.075126Weitao Chen, Liangtao Peng, Hantao Lu, Xiancong LuDramatically different from the Hermitian systems, the conventional bulkboundary correspondence (BBC) is broken in the nonHermitian systems. In this paper, we use edge entanglement entropy to characterize the topological properties of nonHermitian SuSchriefferHeeger Hubbard model. For free fermions, we study the scaling behavior of entanglement entropy and demonstrate that the edge entanglement ...

Photonics Research (IF 7.254) Pub Date : 20210831 ,DOI:10.1364/prj.433188HaiXiao Wang, Li Liang, Bin Jiang, Junhui Hu, Xiancong Lu, and JianHua JiangWe demonstrate that multiple higherorder topological transitions can be triggered via the continuous change of the geometry in kagome photonic crystals composed of three dielectric rods. By tuning a single geometry parameter, the photonic corner and edge states emerge or disappear with higherorder topological transitions. Two distinct higherorder topological insulator phases and a normal insulator ...

Physical Review B (IF 3.908) Pub Date : 20210706 ,DOI:10.1103/physrevb.104.024502Xiancong Lu, D. SénéchalWe investigate the possibility of spin texture in the bilayer cuprate superconductor Bi2Sr2CaCu2O8+δ using cluster dynamical meanfield theory. The oneband Hubbard model with a small interlayer hopping and a Rashba spinorbit coupling is used to describe the material. The dwave order parameter is not much affected by the presence of the Rashba coupling, but a small triplet component appears. We find ...

Physical Review B (IF 3.908) Pub Date : 20210318 ,DOI:10.1103/physrevb.103.115131Yimei Fang, Siyu Chen, Xiancong Lu, Shunqing Wu, ZiZhong ZhuRecently, the square planar MoS2 monolayer, which exhibits the Cairo pentagonal tiling (termed as 1P−MoS2), was identified as an intrinsic quantum anomalous Hall (QAH) insulator. However, there is a paucity of theoretical work concerning a suitable substrate to support its nontrivial electron transport properties, which is the prerequisite for practical applications. Here. we demonstrate that CuI(001) ...

Optics Communications (IF 2.335) Pub Date : 20201224 ,DOI:10.1016/j.optcom.2020.126732Yuanying Zhang, Haoxu Guo, Xiaodong Qiu, Xiancong Lu, Xuechang Ren, Lixiang ChenBased on an LED light source, we present an experimental scheme to produce chromatic and whitelight optical vortices carrying fractional topological charges. In theory, we develop a general formula to simulate the propagation dynamics of such fractional chromatic and whitelight vortices based on the eigenmode decomposition of orbital angular momentum within the Gaussian–Schell model. In the experiment ...

Journal of Physics: Condensed Matter (IF 2.745) Pub Date : 20200819 ,DOI:10.1088/1361648x/aba980Xiancong Lu, Hongxu LiuWe investigate the effect of mixing Rashba/Dresselhaus spinorbit couplings (SOCs) on the topological properties of $D+p$wave superconductors. It is known that the nodal $D+p$wave Rashba superconductors become gapful under a Zeeman magnetic field. We extend this gapgeneration mechanism to mixed Rashba/Dresselhaus systems and find that the induced energy gaps are strongly modified by the Dresselhaus ...

Physical Review B (IF 3.908) Pub Date : 20200818 ,DOI:10.1103/physrevb.102.085135Xiancong Lu, D. SénéchalWe investigate the possibility of spontaneous loop currents in the twoleg ladder cuprate Sr14−xCaxCu24O41 by applying cluster dynamical mean field theory (CDMFT) to a sevenband Hubbard model for that compound, with an exact diagonalization solver. We sample several values of the local interaction Ud and of the CuO energy difference Epd, by applying an external field that induces loop currents. We ...

Journal of Physics: Condensed Matter (IF 2.745) Pub Date : 20200727 ,DOI:10.1088/1361648x/aba980Xiancong Lu,Hongxu LiuWe investigate the effect of mixing Rashba/Dresselhaus spinorbit couplings (SOCs) on the topological properties of D + pwave superconductors. It is known that the nodal D + pwave Rashba superconductors become gapful under a Zeeman magnetic field. We extend this gapgeneration mechanism to mixed Rashba/Dresselhaus systems and find that the induced energy gaps are strongly modified by the Dresselhaus ...

Optics Express (IF 3.833) Pub Date : 20200707 ,DOI:10.1364/oe.397723Fangqing Tang,Xiancong Lu,Lixiang ChenWithin the angularspectrum representation, we study the partially coherent beam propagating in uniaxial crystals along the optical axis. By a method of vortex expansion, we derive the analytical solution for the crossspectral density (CSD) function of an electromagnetic Gaussian Schellmodel (EGSM) beam. We demonstrate that the analytical expression of CSD function can be written into a quasicoherentmode ...

Physical Review B (IF 3.908) Pub Date : 20200526 ,DOI:10.1103/physrevb.101.195143Xiancong Lu, Ying Chen, Huanyang ChenWe investigate the higherorder topological insulators on the breathing kagome lattices with porbital freedom. The bulk topological phase diagram is obtained by calculating the Z3 Berry phase of the pband model. The existence of a different class of orbital corner states is demonstrated on the (zerodimensional) finitesize triangular structure. We find that the transverse hopping of the p orbital ...

Physical Review B (IF 3.908) Pub Date : 20200225 ,DOI:10.1103/physrevb.101.054512Xiancong Lu and D. SénéchalWe investigate the proximity effect in a heterostructure of the topological insulator (TI) Bi2Se3 deposited on the hightemperature superconductor (HTSC) material Bi2Sr2CaCu2O8+δ. The latter is described by the oneband Hubbard model and is treated with cluster dynamical mean field theory (CDMFT), the topological insulator (TI) layers being included via the CDMFT selfconsistency loop. The penetration ...

Optics Express (IF 3.833) Pub Date : 20190919 ,DOI:10.1364/oe.27.028204Fangqing Tang,Xiancong Lu,Lixiang ChenIn the planewave angularspectrum representation, we derive the analytical expressions for any order LaguerreGaussian beams propagating along the optical axis of uniaxial crystals. We further prove the orthogonality of propagating modes inside the uniaxial crystals, and investigate the energy efficiency as well as the behavior of spinorbital coupling. Based on the analytical solutions, we propose ...

Optics Letters (IF 3.56) Pub Date : 20190823 ,DOI:10.1364/ol.44.004251Ying Chen,Xiancong Lu,Huanyang ChenWe theoretically present a simple nanophotonics platform, where the photonic corner states can be obtained in high frequencies. For the breathing Kagome lattice with three bearded truncations, we show that a pair of bonding and antibonding corner states can be observed in the gapped bulk bands, even for a topologically trivial lattice. In particular, this antibonding corner state is totally embedded ...

Physical Review B (IF 3.908) Pub Date : 20181213 ,DOI:10.1103/physrevb.98.245118Xiancong Lu and D. SénéchalWe investigate paritymixing superconductivity in the twodimensional Hubbard model with Rashba spinorbit coupling, using cellular dynamical meanfield theory (CDMFT). A superconducting state with mixed singlet dwave and triplet pwave character is found in a wide range of doping. The singlet component decreases with the amplitude of the Rashba spinorbit coupling, whereas the triplet component increases ...

Applied Physics Letters (IF 3.971) Pub Date : 20181015 ,DOI:10.1063/1.5043229Fangshu Li, Tianzhe Xu, Wuhong Zhang, Xiaodong Qiu, Xiancong Lu, Lixiang ChenAccording to the concept of digital spiral imaging, we reconstruct an arbitrary structured light beam with information based on orbital angular momentum (OAM) eigenstates, i.e., the LaguerreGaussian (LG) modes. We propose a method to realize the rotation and reflection of an image by imparting an extra phase factor to each constituent OAM mode. If each OAM mode is added by a timevarying phase, the ...

EPL (IF 1.958) Pub Date : 20151201 ,DOI:10.1209/02955075/112/54005Chao Yu,Xiancong Lu,Xiaozhong Wang,Lixiang ChenWe present an analytical solution to the nonparaxial propagation of a Gaussian beam, which is based on the asymptotic expansion of a highly oscillatory integral. The advantage of this method is its application to a highly nonparaxial beam and large transverse radius regime, which are hard to reach by previous approximations. The validity of this analytical expansion is fully investigated, by benchmarking ...

Optics Letters (IF 3.56) Pub Date : 20140701 ,DOI:10.1364/ol.39.003728Xiancong Lu,Lixiang ChenWe study the propagation of a nonparaxial Gaussian beam in the isotropic Bi₄Ge₃O₁₂ crystal under an external magnetic field. The analytical solutions in the paraxial limit are derived, which show that a vortex with topological charge m=2 (m=1) generates in the E_ (E(z)) component. Numerical calculations in the nonparaxial regime confirm that, with the assistance of an external magnetic field, the spintoorbital ...

Scientific Reports (IF 4.996) Pub Date : 2014May0 ,DOI:10.1038/srep04865Xiancong Lu,Ziwen Wu,Wuhong Zhang,Lixiang ChenThe law of angular momentum conservation is naturally linked to the rotational symmetry of the involved system. Here we demonstrate theoretically how to break the rotational symmetry of a uniaxial crystal via the electrooptic Pockels effect. By numerical method based on asymptotic expansion, we discover the 3D structure of polarization singularities in terms of C lines and L surfaces embedded in the ...

Optics Express (IF 3.833) Pub Date : 20130411 ,DOI:10.1364/oe.21.008493Xiancong Lu,Lixiang ChenOne difficulty of angular spectrum representation method in studying optical propagation inside anisotropic crystals is to calculate the double integrals containing highly oscillating functions. In this paper, we introduce an accuracy and numerically cheap method based on asymptotic expansion theory to overcome this difficulty, which therefore allows to compute optical fields with arbitrary incident ...

Optics Express (IF 3.833) Pub Date : 20120621 ,DOI:10.1364/oe.20.011753Xiancong Lu,Lixiang ChenBased on the planewave angular spectrum representation, we derive a formal expression for any light fields propagating in biaxial crystals, and particularly, present an effective numerical method to investigate the propagation behavior for a Gaussian light beam. Unlike uniaxial crystals, we observe the intriguing formation, repulsion and disappearance of vortex pairs, as the refractive indices deviate ...

Journal of the Optical Society of America B (IF 2.058) Pub Date : 20111110 ,DOI:10.1364/josab.28.002915Lixiang Chen,Xiancong Lu,Zhongqun ChengBased on spinorbit coupling induced by qplates, we present a feasible experimental proposal for preparing twodimensional spatially inhomogeneous polarizations of light. We further investigate the quantum correlations between these inhomogeneous polarizations of photon pairs generated by spontaneous parametric downconversion, which in essence describe the socalled hypoentanglement that is established ...

Journal of Physics: Condensed Matter (IF 2.745) Pub Date : 20080424 ,DOI:10.1088/09538984/20/21/215227Yu Chuan Wen, Jing Yu Gan, Xiancong Lu, Yue YuWe study the number statistics of ultracold bosons in an optical lattice by performing quantum Monte Carlo simulations for a 1D BoseHubbard model with an external harmonic trap. We calculate the density profile of the system and observe the formation of a Mott plateau as the total number of atoms increases. We also calculate the average probability P(alpha) for a particle to occupy the Fock state ...

Physical Review A (IF 2.971) Pub Date : 20061213 ,DOI:10.1103/physreva.74.063615Xiancong Lu,Yue YuWe study the thermodynamics of ultracold Bose atoms in optical lattices by numerically diagonalizing the meanfield Hamiltonian of the BoseHubbard model. This method well describes the behavior of longrange correlations and therefore is valid deep in the superfluid phase. For the homogeneous BoseHubbard model, we draw the finitetemperature phase diagram and calculate the superfluid density at unity ...

Physical Review A (IF 2.971) Pub Date : 20060417 ,DOI:10.1103/physreva.73.043607Xiancong Lu,Jinbin Li,Yue YuBy using slave particle (slave boson and slave fermion) techniques on the BoseHubbard model, we study the finite temperature properties of ultracold Bose gases in optical lattices. The phase diagrams at finite temperature are depicted by including different types of slave particles and the effect of the finite types of slave particles is estimated. The superfluid density is evaluated using the Landau ...

Journal of Applied Physics (IF 2.877) Pub Date : 20050415 ,DOI:10.1063/1.1882765Xiancong Lu, Shihui Ge, Lixian Jiang, Xinwei WangA chain of ellipsoids model based on “chainofspheres” is proposed to investigate the reversal mechanism of the magnetic nanowire. When the diameter of the individual nanowire is small enough we assume the nanowire to be a chain of rotational symmetric ellipsoids. We investigate the reversal mechanism by this model and derive the expression of the switching field. By the numerical method, the magnetization ...

Physical Review B (IF 3.908) Pub Date : ,DOI:Xiancong Lu, D. SénéchalWe study the twisted Hubbard model of a cuprate bilayer at a fixed twist angle θ=53.13∘ and as a function of doping, using the variational cluster approximation, a method that treats shortrange dynamical correlations exactly. At intermediate interlayer tunneling, we observe a sudden change of the relative sign of the dwave order parameters of two layers between the underdoped and overdoped regimes ...

Physical Review B (IF 3.908) Pub Date : ,DOI:Xiancong Lu, D. SénéchalWe investigate the possibility of spin texture in the bilayer cuprate superconductor $\rm Bi_2Sr_2CaCu_2O_{8+\delta}$ using cluster dynamical mean field theory (CDMFT). The oneband Hubbard model with a small interlayer hopping and a Rashba spinorbit coupling is used to describe the material. The dwave order parameter is not much affected by the presence of the Rashba coupling, but a small triplet ...

Physical Review B (IF 3.908) Pub Date : ,DOI:Xiancong Lu, D. SénéchalWe investigate the possibility of spontaneous loop currents in the twoleg ladder cuprate by applying cluster dynamical mean field theory (CDMFT) to a sevenband Hubbard model for that compound, with an exact diagonalization solver. We sample several values of the local interaction Ud and of the CuO energy difference Epd, by applying an external field that induces loop currents. We find no instance ...
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