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pro vyhledávání: '"McRoberts A"'
There are two competing pictures for how the $O(3)$ non-linear sigma model (NLSM) with a topological theta term renormalises to the $\mathfrak{\hat{su}}(2)_1$ Wess-Zumino-Witten model. In the Affleck-Haldane picture, an `extension field' parametrises
Externí odkaz:
http://arxiv.org/abs/2411.08095
Autor:
McRoberts, Adam J., Moessner, Roderich
Motivated by recent experiments on Google's sycamore NISQ platform on the spin transport resulting from a non-unitary periodic boundary drive of an XXZ chain, we study a classical variant thereof by a combination of analytical and numerical means. We
Externí odkaz:
http://arxiv.org/abs/2407.13816
We study the $J_1$-$J_2$ spin-$1/2$ chain using a path integral constructed over matrix product states (MPS). By virtue of its non-trivial entanglement structure, the MPS ansatz captures the key phases of the model even at a semi-classical, saddle-po
Externí odkaz:
http://arxiv.org/abs/2404.16088
Autor:
McRoberts, Adam J., Moessner, Roderich
Superdiffusion is surprisingly easily observed even in systems without the integrability underpinning this phenomenon. Indeed, the classical Heisenberg chain -- one of the simplest many-body systems, and firmly believed to be non-integrable -- evince
Externí odkaz:
http://arxiv.org/abs/2402.18662
Deep learning (DL) models are gaining popularity in forest variable prediction using Earth Observation images. However, in practical forest inventories, reference datasets are often represented by plot- or stand-level measurements, while high-quality
Externí odkaz:
http://arxiv.org/abs/2308.05005
Publikováno v:
Phys. Rev. Lett. 132, 057202 (2024)
The non-equilibrium dynamics of domain wall initial states in a classical anisotropic Heisenberg chain exhibits a striking coexistence of apparently linear and non-linear behaviours: the propagation and spreading of the domain wall can be captured qu
Externí odkaz:
http://arxiv.org/abs/2306.15351
Publikováno v:
Phys. Rev. B 108, 094204 (2023)
We study the transport and equilibration properties of a classical Heisenberg chain, whose couplings are random variables drawn from a one-parameter family of power-law distributions. The absence of a scale in the couplings makes the system deviate s
Externí odkaz:
http://arxiv.org/abs/2304.05423
Publikováno v:
Phys. Rev. Research 5, 043008 (2023)
We analyze a new class of time-periodic nonreciprocal dynamics in interacting chaotic classical spin systems, whose equations of motion are conservative (phase-space-volume-preserving) yet possess no symplectic structure. As a result, the dynamics of
Externí odkaz:
http://arxiv.org/abs/2208.09005
A classic route for destroying long-lived electronic quasiparticles in a weakly interacting Fermi liquid is to couple them to other low-energy degrees of freedom that effectively act as a bath. We consider here the problem of electrons scattering off
Externí odkaz:
http://arxiv.org/abs/2207.10087
Publikováno v:
Phys. Rev. E 106 L062202 (2022)
Motivated by the KPZ scaling recently observed in the classical ferromagnetic Heisenberg chain, we investigate the role of solitonic excitations in this model. We find that the Heisenberg chain, although well-known to be non-integrable, supports a tw
Externí odkaz:
http://arxiv.org/abs/2207.08866