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Physikalisches Kolloquium: Rydberg Excitons in Cuprous Oxide; Prof. Manfred Bayer, TU Dortmund

Jun 12
12. Juni 2017 16:15 Uhr bis 17:45 Uhr
Hörsaal E, Staudtstr. 5, 91058 Erlangen

Vortrag von Prof. Manfred Bayer von der TU Dortmund:
Rydberg Excitons in Cuprous Oxide

Excitons determine the optical properties of semiconductors. Their description as hydrogen atom-like complexes has turned out to be an extremely successful concept. In Rydberg atoms an electron is promoted into a state with very high principal quantum number. Thereby the atom may become a mesoscopic quantum object with dimensions in the micrometer-range. Recently it was shown that also an exciton can be highly excited by observing states with principal quantum number up to n=25 in natural cuprous oxide crystals [1]. This corresponds to an average radius of more than 1 µm so that the exciton wave function covers more than 10 billion crystal unit cells. Here similarities to and differences from atoms will be addressed for Rydberg excitons. Examples are their level splitting in electric and magnetic fields [2], quantum chaos in magnetic field [3], as well as quantum optical effects like the Rydberg blockade or dressed states [4].

[1] T. Kazimierczuk, D. Fröhlich, S.Scheel, H. Stolz, and M. Bayer, Nature 514, 343 2014).
[2] J. Thewes, J. Heckötter, T. Kazimierczuk, M. Aßmann, D. Fröhlich, M. Bayer, M. A. Semina, and M. M. Glazov, Phys. Rev. Lett. 115, 027402 (2015).
[3] M. Assmann, J. Thewes, D. Fröhlich, and M. Bayer, Nature Materials 15, 741 (2016).
[4] P. Grünwald, M. Aßmann, J. Heckötter, D. Fröhlich, M. Bayer, H. Stolz, and S. Scheel, Phys. Rev. Lett. 117, 133003 (2016).

Vortragssprache ist die des angegebenen Vortragstitels.

Einladender: Prof. Dr. S. Götzinger
Kontakt: Prof. Dr. N. Lindlein