3 papers
quant-ph2025
Graph-theoretical search for integrable multistate Landau-Zener models
Zixuan Li, Chen Sun
The search for exactly solvable models is an evergreen topic in theoretical physics. In the context of multistate Landau-Zener models -- -state quantum systems with linearly tim…
quant-ph2025
Derivation of the Landau-Zener formula via functional equations
Chen Sun
The Landau-Zener formula describes the diabatic transition probability of a two-level system under linear driving. Its rigorous derivation typically relies on sophisticated mathema…
quant-ph2024
Perturbative approach to time-dependent quantum systems and applications to one-crossing multistate Landau-Zener models
Rongyu Hu, Chen Sun
We formulate a perturbative approach for studying a class of multi-level time-dependent quantum systems with constant off-diagonal couplings and diabatic energies being odd functio…