Zobrazeno 1 - 10
of 419
pro vyhledávání: '"Fehske, Holger"'
Autor:
Lange, Florian, Fehske, Holger
Publikováno v:
Scientific Reports 14, 18050 (2024)
Including the previously ignored dispersion of phonons we revisit the metal-insulator transition problem in one-dimensional electron-phonon systems on the basis of a modified spinless fermion Holstein model. Using matrix-product-state techniques we d
Externí odkaz:
http://arxiv.org/abs/2407.14187
Autor:
Lacey, Dane C., Alappat, Christie L., Lange, Florian, Hager, Georg, Fehske, Holger, Wellein, Gerhard
Sparse matrix-vector products (SpMVs) are a bottleneck in many scientific codes. Due to the heavy strain on the main memory interface from loading the sparse matrix and the possibly irregular memory access pattern, SpMV typically exhibits low arithme
Externí odkaz:
http://arxiv.org/abs/2405.12525
Publikováno v:
Physical Review Research 6, L022007 (2024)
We use infinite matrix-product-state techniques to study the time evolution of the charge-density-wave (CDW) order after a quench or a light pulse in a fundamental fermion-boson model. The motion of fermions in the model is linked to the creation of
Externí odkaz:
http://arxiv.org/abs/2403.03108
Autor:
Chakraborty, Monodeep, Fehske, Holger
Publikováno v:
Phys. Rev. B 109, 085125 (2024)
We generalize the two-channel (Edwards) fermion-boson model describing quantum transport in a background medium to the more realistic case of dispersive bosons. Using the variational exact diagonalization technique, we numerically solve the extended
Externí odkaz:
http://arxiv.org/abs/2311.14776
Publikováno v:
Phys. Rev. B 109, 235134 (2023)
Employing a largely unbiased variational exact diagonalization technique, we analyze the consequences of longer-ranged electron hopping and electron-phonon interaction on polaron formation in one dimension. Having at our disposal the accurate ground
Externí odkaz:
http://arxiv.org/abs/2311.12677
Sparse linear iterative solvers are essential for many large-scale simulations. Much of the runtime of these solvers is often spent in the implicit evaluation of matrix polynomials via a sequence of sparse matrix-vector products. A variety of approac
Externí odkaz:
http://arxiv.org/abs/2309.02228
Autor:
Filusch, Alexander, Fehske, Holger
Publikováno v:
Physica B: Condensed Matter 659, 414848 (2024)
Flat bands can be divided into singular and non-singular ones according to the behavior of their Bloch wave function around band-crossing points in momentum space. We analyze the flat band in the Dice model, which can be tuned by a uniaxial strain in
Externí odkaz:
http://arxiv.org/abs/2303.17850
We perform a numerical study of Floquet topological insulators with temporal disorder to investigate the existence of quantized charge transport without Anderson localization. We first argue that in setups with temporal imperfections Anderson localiz
Externí odkaz:
http://arxiv.org/abs/2301.09520
Autor:
Ejima, Satoshi, Fehske, Holger
Utilizing time-evolution techniques in (infinite) matrix-product-state representation, we study the non-equilibrium dynamics of driven Mott insulators and demonstrate photoinduced $\eta$ pairing directly in the thermodynamic limit. Analyzing the time
Externí odkaz:
http://arxiv.org/abs/2301.04496
Autor:
Filusch, Alexander, Fehske, Holger
Publikováno v:
Phys. Rev. B 106, 245106 (2022)
Mechanical deformations in $\alpha$-$\mathcal{T}_3$ lattices induce local pseudomagnetic fields of opposite directionality for different valleys. When this strain is equipped with a dynamical drive, it generates a complementary valley-asymmetric pseu
Externí odkaz:
http://arxiv.org/abs/2210.16522