Zobrazeno 1 - 10
of 36
pro vyhledávání: '"Semkat, Dirk"'
Autor:
Stolz, Heinrich, Semkat, Dirk, Schwartz, Rico, Heckötter, Julian, Aßmann, Marc, Kraeft, Wolf-Dietrich, Fehske, Holger, Bayer, Manfred
For low-density plasmas, the classical limit described by the Debye-H\"uckel theory is still considered as an appropriate description even though a clear experimental proof of this paradigm is lacking due to the problems in determining the plasma-ind
Externí odkaz:
http://arxiv.org/abs/2111.12500
Publikováno v:
J. Phys.: Condens. Matter 33, 475501 (2021)
Analytical results for the dielectric function in RPA are derived for three-, two-, and one-dimensional semiconductors in the weakly-degenerate limit. Based on this limit, quantum corrections are derived. Further attention is devoted to systems with
Externí odkaz:
http://arxiv.org/abs/2108.07733
Publikováno v:
Eur. Phys. J. Spec. Top. 230, 947 (2021)
We investigate quantum many-body effects on Rydberg excitons in cuprous oxide induced by the surrounding electron-hole plasma. Line shifts and widths are calculated by full diagonalisation of the plasma Hamiltonian and compared to results in first or
Externí odkaz:
http://arxiv.org/abs/2104.07344
Autor:
Stolz, Heinrich, Schwartz, Rico, Heckötter, Julian, Aßmann, Marc, Semkat, Dirk, Krüger, Sjard O., Bayer, Manfred
Publikováno v:
Phys. Rev. B 104, 035206 (2021)
In this study we analyze the transmission spectrum of a thin plate of Cuprous Oxide in the range of the absorption of the yellow exciton states with the coherent transfer matrix method. We demonstrate that, in contrast to the usual analysis using Bee
Externí odkaz:
http://arxiv.org/abs/2009.09214
The ongoing COVID-19 pandemic is challenging every part of society. From a scientific point of view the first major task is to predict the dynamics of the pandemic, allowing governments to allocate proper resources and measures to fight it, as well a
Externí odkaz:
http://arxiv.org/abs/2007.02715
Publikováno v:
Phys. Rev. B 100, 155204 (2019)
We develop a many-body approach to the behavior of exciton bound states and the conduction electron band edge in a surrounding electron-hole plasma with a focus on the absorption spectrum of Rydberg excitons in cuprous oxide. The interplay of band ed
Externí odkaz:
http://arxiv.org/abs/1906.10384
Using the theory of imaging with partially coherent light, we derive general expressions for different kinds of interferometric setups like double slit, shift and mirror interference. We show that in all cases the interference patterns depend not onl
Externí odkaz:
http://arxiv.org/abs/1709.06586
We demonstrate that the optical linewidth of Rydberg excitons in Cu2O can be completely explained by scattering with acoustical and optical phonons, whereby the dominant contributions stems from the non-polar optical modes. The consequences for the o
Externí odkaz:
http://arxiv.org/abs/1709.00895
Autor:
Semkat, Dirk, Sobkowiak, Siegfried, Schöne, Florian, Stolz, Heinrich, Koch, Thomas, Fehske, Holger
Publikováno v:
J. Phys. B: At. Mol. Opt. Phys. 50, 204001 (2017)
In this paper we present a hydrodynamic model to describe the dynamics of para- and orthoexcitons in cuprous oxide at ultralow temperatures inside a stress induced potential trap. We take into account the finite lifetime of the excitons, the excitati
Externí odkaz:
http://arxiv.org/abs/1705.08769
Autor:
Stolz, Heinrich, Schwartz, Rico, Kieseling, Frank, Som, Sunipa, Kaupsch, Maria, Sobkowiak, Siegfried, Semkat, Dirk, Naka, Nobuko, Koch, Thomas, Fehske, Holger
Publikováno v:
New J. Phys. 14, 105007 (2012)
We present experiments on the luminescence of excitons confined in a potential trap at milli-Kelvin bath temperatures under cw-excitation. They reveal several distinct features like a kink in the dependence of the total integrated luminescence intens
Externí odkaz:
http://arxiv.org/abs/1206.7029