Zobrazeno 1 - 10
of 558
pro vyhledávání: '"A. A. Eiguren"'
Autor:
Correia, José, Hindmarsh, Mark, Lizarraga, Joanes, Lopez-Eiguren, Asier, Rummukainen, Kari, Urrestilla, Jon
We report on a study of axion string networks using fixed-grid simulations of up to $16384$ points per side. The length of string can be characterised in terms of standard dimensionless parameters $\zeta_\text{w}$ and $\zeta_\text{r}$, the length den
Externí odkaz:
http://arxiv.org/abs/2410.18064
Gravitational waves offer an unprecedented opportunity to look into the violent high-energy processes happening during the reheating phase of our Universe. We consider a Hubble-induced phase transition scenario as a source of a post-inflationary stoc
Externí odkaz:
http://arxiv.org/abs/2409.15450
Exploiting symmetries in the numerical renormalization group (NRG) method significantly enhances performance by improving accuracy, increasing computational speed, and optimizing memory efficiency. Published codes focus on continuous rotations and un
Externí odkaz:
http://arxiv.org/abs/2409.12050
Autor:
Calvo-Fernández, Aitor, Kumar, Manish, Soler-Polo, Diego, Eiguren, Asier, Blanco-Rey, María, Jelínek, Pavel
The mechanism of Kondo screening in strongly correlated molecules with several unpaired electrons on a metal surface is still under debate. Here, we provide a theoretical framework that rationalizes the emergence of Kondo screening involving several
Externí odkaz:
http://arxiv.org/abs/2405.15958
Autor:
Hindmarsh, Mark, Sauls, J. A., Zhang, Kuang, Autti, S., Haley, Richard P., Heikkinen, Petri J., Huber, Stephan J., Levitin, Lev V., Lopez-Eiguren, Asier, Mayer, Adam J., Rummukainen, Kari, Saunders, John, Zmeev, Dmitry
Publikováno v:
Journal of Low Temperature Physics, 215, 495-524 (2024)
First order phase transitions in the very early universe are a prediction of many extensions of the Standard Model of particle physics and could provide the departure from equilibrium needed for a dynamical explanation of the baryon asymmetry of the
Externí odkaz:
http://arxiv.org/abs/2401.07878
Autor:
Calvo-Fernández, Aitor, Soler-Polo, Diego, Solé, Andrés Pinar, Song, Shaotang, Stetsovych, Oleksander, Kumar, Manish, Li, Guangwu, Wu, Jishan, Lu, Jiong, Eiguren, Asier, Blanco-Rey, María, Jelínek, Pavel
We discuss coexistence of Kondo and spin excitation signals in tunneling spectroscopy in strongly correlated polyradical $\pi$-magnetic nanographenes on a metal surface. The Kondo signal is rationalized by a multi-orbital Kondo screening of the unpai
Externí odkaz:
http://arxiv.org/abs/2309.08524
The numerical renormalization group (NRG) has been widely used as a magnetic impurity solver since the pioneering works by Wilson. Over the past decades, a significant attention has been focused on the application of symmetries in order to reduce the
Externí odkaz:
http://arxiv.org/abs/2307.03658
Autor:
Blanco-Pillado, Jose J., Jiménez-Aguilar, Daniel, Lizarraga, Joanes, Lopez-Eiguren, Asier, Olum, Ken D., Urio, Ander, Urrestilla, Jon
Publikováno v:
JCAP 05 (2023) 035
We perform a detailed comparison of the dynamics of cosmic string loops obtained in cosmological field theory simulations with their expected motion according to the Nambu-Goto action. We demonstrate that these loops follow the trajectories predicted
Externí odkaz:
http://arxiv.org/abs/2302.03717
Autor:
Garai-Marin, Haritz, Dias, Manuel dos Santos, Lounis, Samir, Ibañez-Azpiroz, Julen, Eiguren, Asier
Understanding the spin-relaxation mechanism of single adatoms is an essential step towards creating atomic magnetic memory bits or even qubits. Here we present an essentially parameter-free theory by combining \textit{ab-initio} electronic and vibrat
Externí odkaz:
http://arxiv.org/abs/2212.09653
Autor:
Lafuente-Bartolome, Jon, Lian, Chao, Sio, Weng Hong, Gurtubay, Idoia G., Eiguren, Asier, Giustino, Feliciano
We present a theoretical framework to describe polarons from first principles within a many-body Green's function formalism. Starting from a general electron-phonon Hamiltonian, we derive a self-consistent Dyson equation in which the phonon-mediated
Externí odkaz:
http://arxiv.org/abs/2208.06352