Tootfinder

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https://infosec.exchange/@nuthatch/112028698666082…

Enhanced pair-density-wave vertices in a bilayer Hubbard model at half-filling
Fangze Liu, Xu-Xin Huang, Edwin W. Huang, Brian Moritz, Thomas P. Devereaux
https://arxiv.org/abs/2404.01389

Enhanced pair-density-wave vertices in a bilayer Hubbard model at half-filling
Motivated by the pair-density-wave (PDW) state found in the one-dimensional Kondo-Heisenberg chain, we report on a determinant quantum Monte Carlo DQMC study of pair-fields for a two- dimensional half-filled Hubbard layer coupled to an itinerant, non-interacting layer with one electron per site. In a specific range of interlayer hopping, the pairing vertex associated with PDW order becomes more attractive than that for uniform d-wave pairing, although both remain subdominant to the leading anti…

Exploring magnetic anisotropy in bcc-structured ferromagnetic thin films with three spin layers using the fourth order perturbed Heisenberg Hamiltonian
M. S. M. Farhan
https://arxiv.org/abs/2403.13817

Exploring magnetic anisotropy in bcc-structured ferromagnetic thin films with three spin layers using the fourth order perturbed Heisenberg Hamiltonian
This study investigates into the analysis of ferromagnetic thin films with a body centered cubic lattice and three spin layers, utilizing the solution of the fourth-order perturbed Heisenberg Hamiltonian equation with seven magnetic energy parameters. Spin-exchange interaction, magnetic dipole interaction, second-order magnetic anisotropy,fourth-order magnetic anisotropy, applied magnetic field, demagnetization energy, and stress-induced anisotropy were all taken into account. According to 3D p…

Realizing topological quantum magnets with atomic spins on surfaces
Hao Wang, Peng Fan, Jing Chen, Lili Jiang, Hong-Jun Gao, Jose L. Lado, Kai Yang
https://arxiv.org/abs/2403.14145

Realizing topological quantum magnets with atomic spins on surfaces
Artificial quantum systems have emerged as indispensable platforms to realize exotic topological matter in a well-controlled manner. Here, we demonstrate topological quantum Heisenberg spin lattices, engineered with spin chains and two-dimensional spin arrays using spin 1/2 atoms on insulating films in a scanning tunnelling microscope (STM). We engineered with atomic precision both topological and trivial phases of the quantum spin model, realizing first- and second-order topological quantum ma…

Full QCD with milder topological freezing
Claudio Bonanno, Giuseppe Clemente, Massimo D'Elia, Lorenzo Maio, Luca Parente
https://arxiv.org/abs/2404.14151

Full QCD with milder topological freezing
We simulate $N_f=2+1$ QCD at the physical point combining open and periodic boundary conditions in a parallel tempering framework, following the original proposal by M. Hasenbusch for $2d$ $\mathrm{CP}^{N-1}$ models, which has been recently implemented and widely employed in $4d$ $\mathrm{SU}(N)$ pure Yang-Mills theories too. We show that using this algorithm it is possible to achieve an impressive reduction of the auto-correlation time of the topological charge in dynamical fermions simulation…

Fractional type operators on the Heisenberg group
Pablo Rocha
https://arxiv.org/abs/2404.05195 https://arxiv.org/pdf/2404.05195

Fractional type operators on the Heisenberg group
Let $ρ(\cdot)$ be the Koranyi norm on the Heisenberg group $\mathbb{H}^{n} \equiv (\mathbb{R}^{2n} \times \mathbb{R}, \, \cdot \, )$ defined by \[ ρ(x,t) = \left( |x|^{4} + 16 t^{2} \right)^{1/4}, \,\,\,\, (x,t) \in \mathbb{H}^{n}. \] For $0 \leq α< Q:=2n+2$, $m \in \mathbb{N} \cap \left(1 - \fracα{Q}, \infty \right)$, and $m$ positive constants $α_1, ..., α_m$ such that $α_1 + \cdot \cdot \cdot + α_m = Q - α$, we consider the following generalization of the Riesz potential o…

Modelling the magnetic properties of 1D arrays of FePc molecules
Roman Pico, Alejandro Rebola, Jorge Lasave, Paula Abufager, Ignacio Hamad
https://arxiv.org/abs/2404.12945

Modelling the magnetic properties of 1D arrays of FePc molecules
We investigate the magnetic properties of Fe Phthalocyanines (FePc) that are experimentally arranged in quasi one-dimensional chains when they are grown in thin films or powders. By means of DFT calculations we reproduce the structural parameters found in experiments, and then we build a generalized Heisenberg magnetic model with single ion anisotropy, and calculate its parameters. The results show a anisotropic exchange interaction $J$ between FePc molecules, and an easy plane single ion aniso…

SU($\pmb N$) Kondo-Heisenberg chain: Phase diagram, Ising criticality, and the coexistence of heavy quasiparticles and valence bond solid order
Marcin Raczkowski, Fakher F. Assaad
https://arxiv.org/abs/2403.03694

SU($\pmb N$) Kondo-Heisenberg chain: Phase diagram, Ising criticality, and the coexistence of heavy quasiparticles and valence bond solid order
We map out the ground state phase diagram of a one-dimensional SU($N$) Kondo-Heisenberg lattice model at half filling and in the fully antisymmetric self-adjoint representation as a function of $\tfrac {1}{N}$ and Kondo coupling $J_k/t$. On the basis of auxiliary field quantum Monte Carlo (QMC) simulations with even $N$ up to 8, we show that the enlarged SU($N\ge 4$) symmetry realizes a quantum phase transition separating a valence bond solid (VBS) phase occupying a weak coupling part of the ph…