16 citations · 29 across the 8 of their papers we have counts for
8 papers
Green's Function-Free Formalism of Projective Truncation Approximation
Kou-Han Ma, Yue-Hong Wu, Ning-Hua Tong
In previous works, the projected truncation approximation (PTA) was developed as a systematic and controlled method to truncate the equation of motion of Green's functions (GFs) fo…
Majorana Flat Bands in the Vortex Line of Superconducting Weyl Semimetals
Zhicheng Zhang, Kou-Han Ma
We report the emergence of Majorana flat bands (MFBs) in the vortex line of superconducting (SC) time-reversal-symmetry-breaking Weyl semimetals. By considering a Weyl semimetal as…
Orbital Optical Raman Lattice
Zhi-Hao Huang, Kou-Han Ma, Bao-Zong Wang +2
Spin and orbital are two basic degrees of freedom that play significant roles in exploring exotic quantum phases in optical lattices with synthetic spin-orbit coupling (SOC) and hi…
Thermal Broadening of Phonon Spectral Function in Classical Lattice Models: Projective Truncation Approximation
Hu-Wei Jia, Wen-Jun Liu, Yue-Hong Wu +3
Thermal broadening of the quasi-particle peak in the spectral function is an important physical feature in many statistical systems, but it is difficult to calculate. To tackle thi…
Projective-truncation-approximation study of the one-dimensional lattice model
Kou-Han Ma, Yan-Jiang Guo, Lei Wang +1
In this paper, we first develop the projective truncation approximation (PTA) in the Green's function equation of motion (EOM) formalism for classical statistical models. To implem…
Interacting spinless fermions on the square lattice: Charge order, phase separation, and superconductivity
Kou-Han Ma, Ning-Hua Tong
We investigate the phase diagram of spinless fermions on a square lattice with nearest-neighbor interaction, using the recently developed projective truncation approximation in Gre…
Improved strong-coupling perturbation theory of the symmetric Anderson impurity model
Kou-Han Ma, Ning-Hua Tong
In a previous work (N. H. Tong, Phys. Rev. B 92, 165126 (2015)), an equation-of-motion based series expansion formalism was used to do the second-order strong-coupling expansion fo…
Projective Truncation Approximation for Equations of Motion of Two-Time Green's Functions
Peng Fan, Ke Yang, Kou-Han Ma +1
In the equation of motion approach to the two-time Green's functions, conventional Tyablikov-type truncation of the chain of equations is rather arbitrary and apt to violate the an…