Zobrazeno 1 - 10
of 118
pro vyhledávání: '"Waltner, Daniel"'
Publikováno v:
Monthly Notices of the Royal Astronomical Society, stae1342 (2024)
The dynamic spectra of pulsars frequently exhibit diverse interference patterns, often associated with parabolic arcs in the Fourier-transformed (secondary) spectra. Our approach differs from previous ones in two ways: first, we extend beyond the tra
Externí odkaz:
http://arxiv.org/abs/2402.19370
Publikováno v:
Phys. Rev. E 107, 054202 (2023)
Fast scrambling, quantified by the exponential initial growth of Out-of-Time-Ordered-Correlators (OTOCs), is the ability to efficiently spread quantum correlations among the degrees of freedom of interacting systems, and constitutes a characteristic
Externí odkaz:
http://arxiv.org/abs/2211.12147
Publikováno v:
J. Phys. A: Math. Theor. 55 224011 (2022)
The winding number is a concept in complex analysis which has, in the presence of chiral symmetry, a physics interpretation as the topological index belonging to gapped phases of fermions. We study statistical properties of this topological quantity.
Externí odkaz:
http://arxiv.org/abs/2112.14575
Autor:
Waltner, Daniel, Braun, Petr
Publikováno v:
Phys. Rev. B 104, 054432 (2021)
Determining the border between ergodic and localized behavior is of central interest for interacting many-body systems. We consider here the recently very popular spin-chain model that is periodically excited. A convenient description of such a many-
Externí odkaz:
http://arxiv.org/abs/2101.10057
Publikováno v:
J. Phys. A: Math. Theor. 54 345201 (2021)
We derive a formalism to express the spin algebra $\mathfrak{su}(2)$ in a spin $s$ representation in terms of the algebra of $L$ fermionic operators that obey the Canonical Anti-commutation Relations. We also give the reverse direction of expressing
Externí odkaz:
http://arxiv.org/abs/2101.10119
Publikováno v:
Phys. Rev. B 102, 174307 (2020)
We show that local correlators in a wide class of kicked chains can be calculated exactly at light cone edges. Extending previous works on dual-unitary systems, the correlators between local operators are expressed through the expectation values of t
Externí odkaz:
http://arxiv.org/abs/2004.08386
Publikováno v:
Phys. Rev. E 101, 062135 (2020)
The typicality approach and the Hilbert space averaging method as its technical manifestation are important concepts of quantum statistical mechanics. Extensively used for expectation values we extend them in this paper to transition probabilities. I
Externí odkaz:
http://arxiv.org/abs/2002.09396
We show that for dual-unitary kicked chains, built upon a pair of complex Hadamard matrices, correlators of strictly local, traceless operators vanish identically for sufficiently long chains. On the other hand, operators supported at pairs of adjace
Externí odkaz:
http://arxiv.org/abs/2001.01298
Autor:
Waltner, Daniel, Richter, Klaus
Publikováno v:
Phys. Rev. E 100, 042212 (2019)
Despite considerable progress during the last decades in devising a semiclassical theory for classically chaotic quantum systems a quantitative semiclassical understanding of their dynamics at late times (beyond the so-called Heisenberg time $T_H$) i
Externí odkaz:
http://arxiv.org/abs/1903.09557