Hagen Neidhardt

Hagen Neidhardt is a Research Fellow at the Weierstrass Institute for Applied Analysis and Stochastics (WIAS), Berlin. His research focuses on advanced mathematical physics topics including quantum systems, operator theory, and partial differential equations. He specializes in non-autonomous Cauchy problems, scattering theory, and spectral analysis of operators in quantum mechanics.

Neidhardt's work addresses theoretical challenges in mathematical physics, such as Trotter product formulas, boundary triples, and perturbation determinants. His contributions span functional analysis applications to quantum transport, nanowire heterostructures, and spin-boson Hamiltonians. Recent studies include light emitting-absorbing quantum dot devices and non-equilibrium steady states in open quantum systems.

Collaborations with institutions like Humboldt University and contributions to WIAS research groups (e.g., Partial Differential Equations, Laser Dynamics) highlight his role in interdisciplinary mathematical research. His publications explore operator extensions, trace formulas, and mathematical models for semiconductor devices.