Laudatio

In recognition for his outstanding contributions in an unusually wide range of fields of theoretical physics

Prof. Dr. Richard Prange

has been awarded the Martin-Gutzwiller-Fellowship 2001
of the Max Planck Institute for the Physics of Complex Systems.

From early work in particle and nuclear physics Richard Prange moved on to the emerging field of condensed matter where he worked on tunneling of superconducting electron pairs (1963 with Ferrell), formulated a transport theory for metals taking into account the electron-phonon interaction explicitly (with Kadanoff 1964), made an important contribution to surface impedance occuring for metals in an applied magnetic field (with Nee 1967), and developed in a series of papers a local-band theory of ferromagnetism (together with Korenman, 1977-79) where he tried to unify localized and delocalized properties of electrons.
Shortly before a major change in his scientific interest he delivered a widely known paper on the “Quantized Hall resistance and the measurement of the fine structure constant” (1981) and subsequently edited a well received book on the quantum Hall effect (1986).
The change came with his seminal Physical Review Letter of 1982 together with Fishman and Grempel on “Chaos, quantum recurrences and Anderson localization” where he laid ground to a new field, i.e. quantum chaos. Richard Prange has been very active in this field ever since. He introduced mathematical tools from Fredholm theory into semiclassical asymptotic expansions which allowed him to put resummation techniques for the Gutzwiller trace formula onto a mathematically solid ground and to clarify the phenomena of resurgence. With his coworkers he applied the theory successfully to chaos in the quantum mechanics of scattering problems and the scaring of wave functions.
Recently, he has been interested in combining the quantum surface of section method with quasiclassical, perturbative approaches.

Prof. Prange's talk on April 2, 2001
"Special Eigenstates in Quantum Chaos"

http://www.mpipks-dresden.mpg.de/pages/forschung/forschung_gutzwiller.html