No-go rules for multitime Landau-Zener models

TL;DR

This paper establishes no-go rules that restrict the structure of multitime Landau-Zener models, helping to identify which models can or cannot be exactly solvable, thus guiding future research in quantum many-body systems.

Contribution

The authors prove two no-go rules for MTLZ models and use them to classify possible models with up to 9 states, providing a systematic framework for discovering new solvable models.

Findings

Proved the 'no K_{3,3}' rule and 'no 1221' rule for MTLZ models.

Showed that no new models exist with more than 9 states beyond known types.

Provided a classification scheme for potential MTLZ models.

Abstract

Multitime Landau-Zener (MTLZ) model is a class of exactly solvable quantum many-body models which is multitstate and multitime generalization of the two-state Landau-Zener model. Currently discovered MTLZ models include the "hypercubes", the "fans" and their direct product models. In this work, we prove two no-go rules, named the "no $K_{3,3}$" rule and the "no $1221$" rule, which forbid the existence of exact solutions for models with certain structures of interactions. We further apply these rules to show that for models with no more than $9$ states, besides the models mentioned above there are no other MTLZ models. We also propose a scheme to systematically classify cases that could possibly host MTLZ models. Our work could serve as a guideline to search for new exactly solvable models within the MTLZ class.