Zobrazeno 1 - 10
of 380
pro vyhledávání: '"Guhr, T."'
Publikováno v:
Scientific Reports 8, 14620/1-15 (2018)
When dealing with non-stationary systems, for which many time series are available, it is common to divide time in epochs, i.e. smaller time intervals and deal with short time series in the hope to have some form of approximate stationarity on that t
Externí odkaz:
http://arxiv.org/abs/1801.07790
Previously, we demonstrated that the dynamics of kicked spin chains possess a remarkable duality property. The trace of the unitary evolution operator for $N$ spins at time $T$ is related to one of a non-unitary evolution operator for $T$ spins at ti
Externí odkaz:
http://arxiv.org/abs/1602.07479
Publikováno v:
Phys. Rev. Lett. 113, 250201 (2014)
Rectangular real $N \times (N + \nu)$ matrices $W$ with a Gaussian distribution appear very frequently in data analysis, condensed matter physics and quantum field theory. A central question concerns the correlations encoded in the spectral statistic
Externí odkaz:
http://arxiv.org/abs/1409.0360
Publikováno v:
Physical Review E 90, 052909 (2014)
We determine with unprecedented accuracy the lowest 900 eigenvalues of two quantum constant-width billiards from resonance spectra measured with flat, superconducting microwave resonators. While the classical dynamics of the constant-width billiards
Externí odkaz:
http://arxiv.org/abs/1407.6630
Publikováno v:
Phys. Rev. Lett. 104, 164101 (2010)
We measure elastomechanical spectra for a family of thin shells. We show that these spectra can be described by a "semiclassical" trace formula comprising periodic orbits on geodesics, with the periods of these orbits consistent with those extracted
Externí odkaz:
http://arxiv.org/abs/1004.4511
In a unifying way, the doorway mechanism explains spectral properties in a rich variety of open mesoscopic quantum systems, ranging from atoms to nuclei. A distinct state and a background of other states couple to each other which sensitively affects
Externí odkaz:
http://arxiv.org/abs/0805.2345
Publikováno v:
J.Math.Phys.49:063510,2008
We introduce an extension of the character expansion method to the case of supergroups. This method allows us to calculate a superversion of the Leutwyler-Smilga integral which, to the best of our knowledge, has not been calculated before. We also us
Externí odkaz:
http://arxiv.org/abs/0801.1226
Publikováno v:
Phys. Rev. Lett 100, 190404 (2008)
Unexpected relations between fidelity decay and cross form--factor, i.e., parametric level correlations in the time domain are found both by a heuristic argument and by comparing exact results, using supersymmetry techniques, in the framework of rand
Externí odkaz:
http://arxiv.org/abs/0712.3370
We analyze recently measured data for the mechanical deflection of Chromium nano--cantilevers. We show that the deflection curves exhibit a scaling behavior when applying properly chosen coordinates. Moreover, the deflection curves are well described
Externí odkaz:
http://arxiv.org/abs/cond-mat/0603696
Publikováno v:
Phys. Rev. E 70, 036206 (2004)
We calculate the leading Weyl term of the counting function for a mono-crystalline quartz sphere. In contrast to other studies of counting functions, the anisotropy of quartz is a crucial element in our investigation. Hence, we do not obtain a simple
Externí odkaz:
http://arxiv.org/abs/nlin/0504016