Zobrazeno 1 - 10
of 527
pro vyhledávání: '"Mierzejewski M"'
Valence bond (VB) states as the formation mechanism of Cooper pairs, eventually leading to high-temperature superconductivity, remain a controversial topic. Although various VB-like states find variational relevance in the description of specific spi
Externí odkaz:
http://arxiv.org/abs/2411.03771
Relaxation rates in nearly integrable systems usually increase quadratically with the strength of the perturbation that breaks integrability. We show that the relaxation rates can be significantly smaller in systems that are integrable along two inte
Externí odkaz:
http://arxiv.org/abs/2312.11975
We study the transport dynamics of an interacting tilted (Stark) chain. We show that the crossover between diffusive and subdiffusive dynamics is governed by $F\sqrt{L}$, where $F$ is the strength of the field, and $L$ is the wave-length of the excit
Externí odkaz:
http://arxiv.org/abs/2310.01862
Publikováno v:
Phys. Rev. B 108, 064203 (2023)
The random-field spin-1/2 XXZ chains, and the corresponding Anderson insulators of spinless fermions with density-density interaction, have been intensively studied in the context of many-body localization. However, we recently argued [B. Krajewski e
Externí odkaz:
http://arxiv.org/abs/2306.14613
We investigate full quantum mechanical evolution of two electrons nonlinearly coupled to quantum phonons and simulate the dynamical response of the system subject to a short spatially uniform optical pulse that couples to dipole-active vibrational mo
Externí odkaz:
http://arxiv.org/abs/2305.09238
Autor:
Jażdżewska, A., Mierzejewski, M., Środa, M., Nocera, A., Alvarez, G., Dagotto, E., Herbrych, J.
Publikováno v:
Nat. Commun. 14, 8524 (2023)
One of the most famous quantum systems with topological properties, the spin $\mathcal{S}=1$ antiferromagnetic Heisenberg chain, is well-known to display exotic $\mathcal{S}=1/2$ edge states. However, this spin model has not been analyzed from the mo
Externí odkaz:
http://arxiv.org/abs/2304.11154
Publikováno v:
Phys. Rev. B 108, 035106 (2023)
In recent years the ergodicity of disordered spin chains has been investigated via extensive numerical studies of the level statistics or the transport properties. However, a clear relationship between these results has yet to be established. We pres
Externí odkaz:
http://arxiv.org/abs/2302.03325
Publikováno v:
Phys. Rev. B 108, L081115 (2023)
The isotropic Heisenberg chain represents a particular case of an integrable many-body system exhibiting superdiffusive spin transport at finite temperatures. Here, we show that this model has distinct properties also at finite magnetization $m\ne0$,
Externí odkaz:
http://arxiv.org/abs/2211.17181
Publikováno v:
Phys. Rev. Lett. 129, 260601 (2022)
We consider a chain of interacting fermions with random disorder that was intensively studied in the context of many-body localization. We show that only a small fraction of the two-body interaction represents a true local perturbation to the Anderso
Externí odkaz:
http://arxiv.org/abs/2209.00661
Publikováno v:
Phys. Rev. B 107, 045134 (2023)
Purely ballistic transport is a rare feature even for integrable models. By numerically studying the Heisenberg chain with the power-law exchange, \mbox{$J\propto1/r^\alpha$}, where $r$ is a distance, we show that for spin anisotropy $\Delta \simeq \
Externí odkaz:
http://arxiv.org/abs/2206.05960