Validity of spin-wave theory for the quantum Heisenberg model
Validity of spin-wave theory for the quantum Heisenberg model
Spin-wave theory is a key ingredient in our comprehension of quantum spin systems, and is used successfully for understanding a wide range of magnetic phenomena, including magnon condensation and stability of patterns in dipolar systems. Nevertheless, several decades of research failed to establish the validity of spin-wave theory rigorously, even …