Zobrazeno 1 - 10
of 73
pro vyhledávání: '"Wallerberger, Markus"'
Autor:
Rohshap, Stefan, Ritter, Marc K., Shinaoka, Hiroshi, von Delft, Jan, Wallerberger, Markus, Kauch, Anna
We present the first application of quantics tensor trains (QTTs) and tensor cross interpolation (TCI) to the solution of a full set of self-consistent equations for multivariate functions, the so-called parquet equations. We show that the steps need
Externí odkaz:
http://arxiv.org/abs/2410.22975
Autor:
Dirnböck, Selina, Lee, Seung-Sup B., Kugler, Fabian B., Huber, Sebastian, von Delft, Jan, Held, Karsten, Wallerberger, Markus
Two-particle response functions are a centerpiece of both experimental and theoretical quantum many-body physics. Yet, due to their size and discontinuity structure, they are challenging to handle numerically. Recently, two advances were made to tack
Externí odkaz:
http://arxiv.org/abs/2404.05541
Autor:
Si, Liang, Wallerberger, Markus, Smolyanyuk, Andriy, di Cataldo, Simone, Tomczak, Jan M., Held, Karsten
We briefly review the status quo of research on the putative superconductor Pb$_9$Cu(PO$_4$)$_6$O also known as LK-99. Further, we provide {\em ab initio} derived tight-binding parameters for a two- and five-band model, and solve these in dynamical-m
Externí odkaz:
http://arxiv.org/abs/2308.04427
Autor:
Ritter, Marc K., Fernández, Yuriel Núñez, Wallerberger, Markus, von Delft, Jan, Shinaoka, Hiroshi, Waintal, Xavier
Publikováno v:
Phys. Rev. Lett. 132, 056501 (2024)
Multivariate functions of continuous variables arise in countless branches of science. Numerical computations with such functions typically involve a compromise between two contrary desiderata: accurate resolution of the functional dependence, versus
Externí odkaz:
http://arxiv.org/abs/2303.11819
We describe an aberration of the resampling estimator for the Green's function customarily used in hybridization expansion continuous-time quantum Monte Carlo. It occurs due to Pauli principle constraints in calculations of Anderson impurity models w
Externí odkaz:
http://arxiv.org/abs/2211.06266
Autor:
Shinaoka, Hiroshi, Wallerberger, Markus, Murakami, Yuta, Nogaki, Kosuke, Sakurai, Rihito, Werner, Philipp, Kauch, Anna
Publikováno v:
Phys. Rev. X 13, 021015 (2023)
Correlation functions of quantum systems -- central objects in quantum field theories -- are defined in high-dimensional space-time domains. Their numerical treatment thus suffers from the curse of dimensionality, which hinders the application of sop
Externí odkaz:
http://arxiv.org/abs/2210.12984
The vanguard of many-body theory is nowadays dealing with the full frequency dynamics of n-point Green's functions for n higher than two. Numerically, these objects easily become a memory bottleneck, even when working with discrete imaginary-time Mat
Externí odkaz:
http://arxiv.org/abs/2207.01681
Autor:
Wallerberger, Markus, Badr, Samuel, Hoshino, Shintaro, Kakizawa, Fumiya, Koretsune, Takashi, Nagai, Yuki, Nogaki, Kosuke, Nomoto, Takuya, Mori, Hitoshi, Otsuki, Junya, Ozaki, Soshun, Sakurai, Rihito, Vogel, Constanze, Witt, Niklas, Yoshimi, Kazuyoshi, Shinaoka, Hiroshi
Publikováno v:
SoftwareX 21, 101266 (2023)
We introduce sparse-ir, a collection of libraries to efficiently handle imaginary-time propagators, a central object in finite-temperature quantum many-body calculations. We leverage two concepts: firstly, the intermediate representation (IR), an opt
Externí odkaz:
http://arxiv.org/abs/2206.11762
Autor:
Wallerberger, Markus, Held, Karsten
Publikováno v:
Phys. Rev. Research 4, 033238 (2022)
Ranking bit patterns -- finding the index of a given pattern in an ordered sequence -- is a major bottleneck scaling up numerical quantum many-body calculations, as fermionic and hard-core bosonic states translate naturally to bit patterns. Tradition
Externí odkaz:
http://arxiv.org/abs/2203.04158
Autor:
Watzenböck, Clemens, Wallerberger, Markus, Ruzicka, Laurenz, Worm, Paul, Held, Karsten, Kauch, Anna
Publikováno v:
Phys. Rev. B 106, 085135 (2022)
We study photoexcitations in small Hubbard clusters of up to 12 sites, some of which show an increase of the double occupation after the electric field pulse through impact ionization. Here, the time-dependent electromagnetic field is introduced thro
Externí odkaz:
http://arxiv.org/abs/2112.00685