Peng Huanwu Center for Fundamental Theory

Spin-current-controlled anisotropic deformation of magnetic lump solitons

We investigate a (2+1)-dimensional nonlinear spin system containing an effective spin-current transport term. Based on its integrable structure, exact magnetic lump solutions are constructed on a rotating spin background, including both fundamental and higher-order configurations...

Superconformal index for $$ \mathcal{N} $$ = 4 super Yang-Mills and elliptic Macdonald polynomials

A bstract We establish a connection between the superconformal index of $$ \mathcal{N} $$ N = 4 U ( N ) SYM and the elliptic Ruijsenaars-Schneider integrable system. The index admits an expression in terms of elliptic Macdonald polynomials, which leads to a compact summation over...

Tensor-network analysis of root patterns in the XXX model with open boundaries

The string hypothesis of Bethe roots is a cornerstone in the thermodynamic analysis of quantum integrable systems, since it connects root configurations with physical quantities such as the ground-state energy, surface energy and excitation spectra. For integrable models with U(1...

Thermodynamics of the Heisenberg XXX chain with negative spin

A bstract We study the thermodynamics of the isotropic Heisenberg XXX spin chain with negative spin, focusing on the case s = –1. The model is equivalent to the quantum lattice nonlinear Schrödinger (NLS) model and appears as an effective theory in deep inelastic scattering in hi...