Zobrazeno 1 - 10
of 86
pro vyhledávání: '"Wolf, F. Alexander"'
While generative models have shown great success in generating high-dimensional samples conditional on low-dimensional descriptors (learning e.g. stroke thickness in MNIST, hair color in CelebA, or speaker identity in Wavenet), their generation out-o
Externí odkaz:
http://arxiv.org/abs/1910.01791
Publikováno v:
Phys. Rev. X 5, 041032 (2015)
We present a new impurity solver for dynamical mean-field theory based on imaginary-time evolution of matrix product states. This converges the self-consistency loop on the imaginary-frequency axis and obtains real-frequency information in a final re
Externí odkaz:
http://arxiv.org/abs/1507.08650
Publikováno v:
Phys. Rev. B 92, 155126 (2015)
Many numerical techniques for the description of quantum systems that are coupled to a continuous bath require the discretization of the latter. To this end, a wealth of methods has been developed in the literature, which we classify as (i) direct di
Externí odkaz:
http://arxiv.org/abs/1507.07468
Publikováno v:
Phys. Rev. X 5, 031039 (2015)
We study the unitary time evolution of antiferromagnetic order in the Hubbard model after a quench starting from the perfect N\'eel state. In this setup, which is well suited for experiments with cold atoms, one can distinguish fundamentally differen
Externí odkaz:
http://arxiv.org/abs/1504.02461
Publikováno v:
Phys. Rev. B 91, 115144 (2015)
We link linear prediction of Chebyshev and Fourier expansions to analytic continuation. We push the resolution in the Chebyshev-based computation of $T=0$ many-body spectral functions to a much higher precision by deriving a modified Chebyshev series
Externí odkaz:
http://arxiv.org/abs/1501.07216
Publikováno v:
Phys. Rev. B 91, 155115 (2015)
We introduce a strictly single-site DMRG algorithm based on the subspace expansion of the Alternating Minimal Energy (AMEn) method. The proposed new MPS basis enrichment method is sufficient to avoid local minima during the optimisation, similarly to
Externí odkaz:
http://arxiv.org/abs/1501.05504
Publikováno v:
Phys. Rev. B 90, 235131 (2014)
We solve the nonequilibrium dynamical mean-field theory (DMFT) using matrix product states (MPS). This allows us to treat much larger bath sizes and by that reach substantially longer times (factor $\sim$ 2 -- 3) than with exact diagonalization. We s
Externí odkaz:
http://arxiv.org/abs/1410.3342
Publikováno v:
Phys. Rev. B 90, 115124 (2014)
We compute the spectral functions for the two-site dynamical cluster theory and for the two-orbital dynamical mean-field theory in the density-matrix renormalization group (DMRG) framework using Chebyshev expansions represented with matrix product st
Externí odkaz:
http://arxiv.org/abs/1407.1622
Autor:
Wolf, F. Alexander, Vallone, Fabio, Romero, Guillermo, Kollar, Marcus, Solano, Enrique, Braak, Daniel
Publikováno v:
Phys. Rev. A 87, 023835 (2013)
We study the quantum Rabi model within the framework of the analytical solution developed in Phys. Rev. Lett. 107,100401 (2011). In particular, through time-dependent correlation functions, we give a quantitative criterion for classifying two regions
Externí odkaz:
http://arxiv.org/abs/1211.6469
Publikováno v:
Phys. Rev. A 85, 053817 (2012)
We use the analytical solution of the quantum Rabi model to obtain absolutely convergent series expressions of the exact eigenstates and their scalar products with Fock states. This enables us to calculate the numerically exact time evolution of <\si
Externí odkaz:
http://arxiv.org/abs/1203.6039