Zobrazeno 1 - 10
of 85
pro vyhledávání: '"Peter Schmitteckert"'
Publikováno v:
New Journal of Physics, Vol 15, Iss 1, p 013058 (2013)
We determine numerically the single-particle and the two-particle spectrum of the three-state quantum Potts model on a lattice by using the density matrix renormalization group method, and extract information on the asymptotic (small momentum) S -mat
Externí odkaz:
https://doaj.org/article/45e89e91e7304f8c889b3a794252fbdb
Autor:
Michael Bonitz, Miroslav Hopjan, Niclas Schlünzen, Stefan Hese, Peter Schmitteckert, Jan-Philip Joost, Claudio Verdozzi
Publikováno v:
Contributions to Plasma Physics. 62
The energy gap of correlated Hubbard clusters is well studied for one-dimensional systems using analytical methods and density-matrix- renormalization-group (DMRG) simulations. Beyond 1D, however, exact results are available only for small systems by
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6e40314ac807cdb03f42f55df86541cb
https://doi.org/10.1002/ctpp.202000220
https://doi.org/10.1002/ctpp.202000220
Autor:
Peter Schmitteckert
We present an extension of reverse engineered Kohn-Sham potentials from a density matrix renormalization group calculation towards the construction of a density functional theory functional via deep learning. Instead of applying machine learning to t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::21f7c5358115e5fc427100e589cc1eff
http://arxiv.org/abs/2008.07923
http://arxiv.org/abs/2008.07923
Publikováno v:
Physical Review B. 101
The large-scale dynamics of quantum integrable systems is often dominated by ballistic modes due to the existence of stable quasiparticles. We here consider as an archetypical example for such a system the spin-$\frac{1}{2}$ XXX Heisenberg chain that
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::385fbe80fe5a44be7087f32600df70bd
https://doi.org/10.1103/physrevb.101.045115
https://doi.org/10.1103/physrevb.101.045115
Publikováno v:
Physical Review B. 99
We present exact results for the susceptibility of the interacting resonant level model in equilibrium. Detailed simulations using both the Numerical Renormalization Group and Density Matrix Renormalization Group were performed in order to compare wi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7b84fccc53cb034d7181a80e1086df38
https://doi.org/10.1103/physrevb.99.085122
https://doi.org/10.1103/physrevb.99.085122
Autor:
Peter Schmitteckert
Publikováno v:
Physical chemistry chemical physics : PCCP. 20(43)
In this work we discuss the extraction of mean field single particle Hamiltonians from a many body wave function of a fermionic system. While we primarily discuss lattice models we also look at neon in an augccpvdz basis set as an example. Our approa
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::85768abfedaf521f4a89103ee3eb0d9b
https://pubmed.ncbi.nlm.nih.gov/30371691
https://pubmed.ncbi.nlm.nih.gov/30371691
Autor:
Peter Schmitteckert
Numerical approaches are an important tool to study strongly correlated quantum systems. However, their fragility with respect to rounding errors is not well studied and numerically verified enclosures of the results are not available. In this work w
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::20d24238215d2a5b182266df874f4b2a
http://arxiv.org/abs/1804.05329
http://arxiv.org/abs/1804.05329
Autor:
Peter Wölfle, Peter Schmitteckert
Publikováno v:
The European Physical Journal Special Topics. 224:1087-1103
We review our recent work on quantum phase transitions in frustrated magnetic systems. In the first part a Pseudo Fermion Functional Renormalization Group (PFFRG) method is presented. By using an exact representation of spin 1/2 operators in terms of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::91992a42012675212198321b89fcae37
https://doi.org/10.1140/epjst/e2015-02447-2
https://doi.org/10.1140/epjst/e2015-02447-2
Autor:
Peter Schmitteckert
We present an infinite lattice DMRG sweeping procedure which can be used as a replacement for the standard infinite lattice blocking schemes. Although the scheme is generally applicable to any system, its main advantages are the correct representatio
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ed14650f595f4a205e38d0f06131e3df
Publikováno v:
Physical Review B. 96
Avenues of Majorana bound states (MBSs) have become one of the primary directions towards a possible realization of topological quantum computation. For a Y-junction of Kitaev quantum wires, we numerically investigate the braiding of MBSs while consi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e79428aad67c9737431346335824afad
https://doi.org/10.1103/physrevb.96.094307
https://doi.org/10.1103/physrevb.96.094307