Zobrazeno 1 - 10
of 85
pro vyhledávání: '"Sbierski, Björn"'
Quantum spin models with a large number of interaction partners per spin are frequently used to describe modern many-body quantum optical systems like arrays of Rydberg atoms, atom-cavity systems or trapped ion crystals. For theoretical analysis the
Externí odkaz:
http://arxiv.org/abs/2407.18156
Autor:
Schneider, Benedikt, Sbierski, Björn
In frustrated magnetism, the empirically found quantum-to-classical correspondence (QCC) matches the real-space static susceptibility pattern of a quantum spin-$1/2$ model with its classical counterpart computed at a certain elevated temperature. Thi
Externí odkaz:
http://arxiv.org/abs/2407.09401
Autor:
Schneider, Benedikt, Reuther, Johannes, Gonzalez, Matías G., Sbierski, Björn, Niggemann, Nils
We implement the temperature flow scheme first proposed by Honerkamp and Salmhofer in Phys.~Rev.~B 64, 184516 (2001) into the pseudo-Majorana functional renormalization group method for quantum spin systems. Since the renormalization group parameter
Externí odkaz:
http://arxiv.org/abs/2312.14838
Autor:
Müller, Tobias, Kiese, Dominik, Niggemann, Nils, Sbierski, Björn, Reuther, Johannes, Trebst, Simon, Thomale, Ronny, Iqbal, Yasir
Publikováno v:
Rep. Prog. Phys. 87, 036501 (2024)
For decades, frustrated quantum magnets have been a seed for scientific progress and innovation in condensed matter. As much as the numerical tools for low-dimensional quantum magnetism have thrived and improved in recent years due to breakthroughs i
Externí odkaz:
http://arxiv.org/abs/2307.10359
Autor:
Sbierski, Björn, Bintz, Marcus, Chatterjee, Shubhayu, Schuler, Michael, Yao, Norman Y., Pollet, Lode
Publikováno v:
PhysRevB.109.144411 (2024)
Motivated by a recent experiment on a square-lattice Rydberg atom array realizing a long-range dipolar XY model [Chen et al., Nature (2023)], we numerically study the model's equilibrium properties. We obtain the phase diagram, critical properties, e
Externí odkaz:
http://arxiv.org/abs/2305.03673
Publikováno v:
SciPost Phys. 15.5.183 (2023)
In the field of quantum many-body physics, the spectral (or Lehmann) representation simplifies the calculation of Matsubara n-point correlation functions if the eigensystem of a Hamiltonian is known. It is expressed via a universal kernel function an
Externí odkaz:
http://arxiv.org/abs/2304.03774
Publikováno v:
Phys. Rev. B 106 (2022), 235113
The pseudo-fermion representation for $S=1/2$ quantum spins introduces unphysical states in the Hilbert space which can be projected out using the Popov-Fedotov trick. However, state-of-the-art implementation of the functional renormalization group m
Externí odkaz:
http://arxiv.org/abs/2209.13484
Publikováno v:
SciPost Phys. 12, 156 (2022)
We employ a recently developed variant of the functional renormalization group method for spin systems, the so-called pseudo Majorana functional renormalization group, to investigate three-dimensional spin-1/2 Heisenberg models at finite temperatures
Externí odkaz:
http://arxiv.org/abs/2112.08104
Publikováno v:
Physical Review B 106, 035413 (2022)
The combination of two-dimensional Dirac surface states with s-wave superconductivity is expected to generate localized topological Majorana zero modes in vortex cores. Putative experimental signatures of these modes have been reported for heterostru
Externí odkaz:
http://arxiv.org/abs/2107.11226
Publikováno v:
Phys. Rev. B 103, 104431 (2021)
The pseudofermion functional renormalization group (PFFRG) method has proven to be a powerful numerical approach to treat frustrated quantum spin systems. In its usual implementation, however, the complex fermionic representation of spin operators in
Externí odkaz:
http://arxiv.org/abs/2012.14836