Twisted photons and electrons
Prof. Dr. Valeriy G. Serbo (Novosibirsk State University, Russia)

In modern optics there are well known states of the laser beam whose photons have a nonzero value of the orbital angular momentum projection on the beam propagation axis. Very recently new experiments had been performed in which the twisted photons with the energy of two orders of magnitude larger and smaller had been produced. Moreover, several groups have reported successful creation of twisted electrons and their remarkable focusing to the focal spot of less than 0.12 nm in diameter.

In my talk I review unusual properties of several atomic processes with twisted photons and electrons (new selection rules, unusual angular distribution and polarization of the final particles) which had been discuss in our recent papers.

References:

U.D. Jentschura, V.G. Serbo ``Generation of high—energy photons with large orbital angular momentum by Compton backscattering', Phys. Rev. Lett. 106 (2011) 013001

U.D. Jentschura, V.G. Serbo ``Compton upconversion of twisted photons: backscat-tering of particles with non-planar wave functions', Eur. Phys. Journ. C 71 (2011) 1571

I.P. Ivanov, V.G. Serbo ``Scattering of twisted particles: extension to wave packets and orbital helicity', Phys. Rev. A 84 (2011) 033804

O. Matula, A.G. Hayrapetyan, V.G. Serbo, A. Surzhykov, S. Fritzsche. ``Atomic ionization of hydrogen-like ions by twisted photons: angular distribution of emitted electrons', J. of Physics B 46 (2013) 205002

O. Matula, A.G. Hayrapetyan, V.G. Serbo, A. Surzhykov, S. Fritzsche. ``Radiative capture of twisted electrons by bare ions', New J. of Physics 16 (2014) 053024

H. M. Scholz-Marggraf, S. Fritzsche, V. G. Serbo, A. Afanasev, A. Surzhykov. ``Absorption of twisted light by hydrogenlike atoms'. Phys. Rev. A 90 (2014) 013425

A. Surzhykov, D. Seipt, V.G. Serbo, S. Fritzsche. ``Interaction of twisted light with many--electron atoms and ions'. Physical Review A 91 (2015) 013403

I.P.Ivanov, V.G. Serbo, A. Surzhykov, S. Fritzsche, D. Seipt. ``Scattering of twisted relativistic electrons by atoms' In preparation