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pro vyhledávání: '"Cohen, Guy"'
Quantum transport is often characterized not just by mean observables like the particle or energy current, but by their fluctuations and higher moments, which can act as detailed probes of the physical mechanisms at play. However, relatively few theo
Externí odkaz:
http://arxiv.org/abs/2408.09477
A precise dynamical characterization of quantum impurity models with multiple interacting orbitals is challenging. In quantum Monte Carlo methods, this is embodied by sign problems. A dynamical sign problem makes it exponentially difficult to simulat
Externí odkaz:
http://arxiv.org/abs/2407.00771
Autor:
Gelman, Samuel D., Cohen, Guy
Entropy is a central concept in physics, but can be challenging to calculate even for systems that are easily simulated. This is exacerbated out of equilibrium, where generally little is known about the distribution characterizing simulated configura
Externí odkaz:
http://arxiv.org/abs/2405.04877
We investigate the real-time dynamics of the sub-Ohmic spin-boson model across a broad range of coupling strengths, using the numerically exact inchworm quantum Monte Carlo algorithm. From short- and intermediate-time dynamics starting from an initia
Externí odkaz:
http://arxiv.org/abs/2402.18561
Publikováno v:
Rep. Prog. Phys. 87, 118001 (2024)
Describing the ground states of continuous, real-space quantum many-body systems, like atoms and molecules, is a significant computational challenge with applications throughout the physical sciences. Recent progress was made by variational methods b
Externí odkaz:
http://arxiv.org/abs/2402.06577
Autor:
Künzel, Fabian, Erpenbeck, André, Werner, Daniel, Arrigoni, Enrico, Gull, Emanuel, Cohen, Guy, Eckstein, Martin
A description of long-lived photo-doped states in Mott insulators is challenging, as it needs to address exponentially separated timescales. We demonstrate how properties of such states can be computed using numerically exact steady state techniques,
Externí odkaz:
http://arxiv.org/abs/2311.13933
We study bulk particle transport in a Fermi-Hubbard model on an infinite-dimensional Bethe lattice, driven by a constant electric field. Previous numerical studies showed that one dimensional analogs of this system exhibit a breakdown of diffusion du
Externí odkaz:
http://arxiv.org/abs/2311.08893
Autor:
Cohen, Guy, Lin, Michael
Let $T$ be a bounded linear operator on a Banach space $X$ satisfying $\|T^n\|/n \to 0$. We prove that $T$ is uniformly ergodic if and only if the one-sided ergodic Hilbert transform $H_Tx:= \lim_{n\to\infty} \sum_{k=1}^n k^{-1}T^k x$ converges for e
Externí odkaz:
http://arxiv.org/abs/2310.15561
Autor:
Cohen, Guy, Conze, Jean-Pierre
Let $(X_{\underline{\ell}})_{\underline{\ell} \in \mathbb Z^d}$ be a real random field (r.f.) indexed by $\mathbb Z^d$ with common probability distribution function $F$. Let $(z_k)_{k=0}^\infty$ be a sequence in $\mathbb Z^d$. The empirical process o
Externí odkaz:
http://arxiv.org/abs/2301.11576