STU-GTIIT光学论坛（No.51）

报告地点：at lecture hall E508 in the North Campus of GTIIT

报告时间：2025年10月21日 17:00

报告题目: Coexistence of phases in confined fermionic chains in a Wannier-Stark potential

报告人：Prof. Karen Hallberg(Centro Atómico Bariloche and Instituto Balseiro Bariloche, Argentina)

报告摘要:

We study interacting fermions on a finite chain in a Wannier-Stark linear potential using the density matrix renormalization group numerical technique. For the generalized extended Hubbard model, we find that the ground state exhibits a staircase of (quasi) plateaus in the average local site density along the chain, decreasing from being doubly filled to empty as the potential increases. These “plateaus” represent locked-in commensurate phases of charge density waves together with band and Mott insulators. These phases are separated by incompressible regions with incommensurate fillings, as observed from dynamical properties. We suggest that experimental variations of the slope of the potential and the range of the repulsive interactions will produce such a coexistence of phases.

We also study the effect of correlations on the localisation length of an extended spinless model with nearest neighbour repulsion and compare with exact analytical results.

欢迎全校师生参加！

理学院

2025年10月15日