Zobrazeno 1 - 10
of 362
pro vyhledávání: '"Gull, Emanuel"'
By merging algorithmic Matsubara integration with discrete pole representations we present a procedure to generate fully analytic closed form results for impurity problems at fixed perturbation order. To demonstrate the utility of this approach we st
Externí odkaz:
http://arxiv.org/abs/2407.01389
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:
Iskakov, Sergei, Yeh, Chia-Nan, Pokhilko, Pavel, Yu, Yang, Zhang, Lei, Harsha, Gaurav, Abraham, Vibin, Wen, Ming, Wang, Munkhorgil, Adamski, Jacob, Chen, Tianran, Gull, Emanuel, Zgid, Dominika
The accurate ab initio simulation of molecules and periodic solids with diagrammatic perturbation theory is an important task in quantum chemistry, condensed matter physics, and materials science. In this article, we present the WeakCoupling module o
Externí odkaz:
http://arxiv.org/abs/2406.18479
Autor:
Dong, Xinyang, Gull, Emanuel
The exploitation of space group symmetries in numerical calculations of periodic crystalline solids accelerates calculations and provides physical insight. We present results for a space-group symmetry adaptation of electronic structure calculations
Externí odkaz:
http://arxiv.org/abs/2405.09494
The non-equilibrium Green's function gives access to one-body observables for quantum systems. Of particular interest are quantities such as density, currents, and absorption spectra which are important for interpreting experimental results in quantu
Externí odkaz:
http://arxiv.org/abs/2405.08737
Autor:
Smolenski, Shane, Wen, Ming, Li, Qiuyang, Downey, Eoghan, Alfrey, Adam, Liu, Wenhao, Kondusamy, Aswin L. N., Bostwick, Aaron, Jozwiak, Chris, Rotenberg, Eli, Zhao, Liuyan, Deng, Hui, Lv, Bing, Zgid, Dominika, Gull, Emanuel, Jo, Na Hyun
Excitons, bound electron-hole pairs, influence the optical properties in strongly interacting solid state systems. Excitons and their associated many-body physics are typically most stable and pronounced in monolayer materials. Bulk systems with larg
Externí odkaz:
http://arxiv.org/abs/2403.13897
Imaginary-time response functions of finite-temperature quantum systems are often obtained with methods that exhibit stochastic or systematic errors. Reducing these errors comes at a large computational cost -- in quantum Monte Carlo simulations, the
Externí odkaz:
http://arxiv.org/abs/2403.12349
We show that the amplitude mode in superconductors exhibits chirped oscillations under resonant excitation and that the chirping velocity increases as we approach the critical excitation strength. The chirped amplitude mode enables us to determine th
Externí odkaz:
http://arxiv.org/abs/2403.01589
Unambiguous fluctuation decomposition of the self-energy: pseudogap physics beyond spin fluctuations
Correlated electron systems may give rise to multiple effective interactions whose combined impact on quasiparticle properties can be difficult to disentangle. We introduce an unambiguous decomposition of the electronic self-energy which allows us to
Externí odkaz:
http://arxiv.org/abs/2401.08543
Publikováno v:
Phys. Rev. B 109, 075112 (2024)
The many-body Green's function provides access to electronic properties beyond density functional theory level in ab inito calculations. In this manuscript, we propose a deep learning framework for predicting the finite-temperature Green's function i
Externí odkaz:
http://arxiv.org/abs/2312.14680