Multi-Dimensional Quantum Walks: a Playground of Dirac and Schr\'{o}dinger Particles

Autor:	Yamagishi, Manami, Hatano, Naomichi, Imura, Ken-Ichiro, Obuse, Hideaki
Rok vydání:	2022
Předmět:	Quantum Physics Condensed Matter - Statistical Mechanics Mathematical Physics
Zdroj:	Phys. Rev. A 107, 042206 (2023)
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevA.107.042206
Popis:	We propose a new multi-dimensional discrete-time quantum walk (DTQW), whose continuum limit is an extended multi-dimensional Dirac equation, which can be further mapped to the Schr\"{o}dinger equation. We show in two ways that our DTQW is an excellent measure to investigate the two-dimensional (2D) extended Dirac Hamiltonian and higher-order topological materials. First, we show that the dynamics of our DTQW resembles that of a 2D Schr\"{o}dinger harmonic oscillator. Second, we find in our DTQW topological features of the extended Dirac system. By manipulating the coin operators, we can generate not only standard edge states but also corner states. Comment: 15 pages, 11 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2212.13044 Zobrazit plný text záznamu View this record from Arxiv