Zobrazeno 1 - 10
of 76
pro vyhledávání: '"Raczkowski, Marcin"'
Autor:
Reinold, Anneke, Berger, Lucas, Raczkowski, Marcin, Zhao, Zhiying, Kohama, Yoshimitsu, Gen, Masaki, Gorbunov, Denis I., Skourski, Yurii, Zherlitsyn, Sergei, Assaad, Fakher F., Lorenz, Thomas, Wang, Zhe
We report on a comprehensive thermodynamic study of a quasi-two-dimensional (quasi-2D) quantum magnet Cu$_2$(OH)$_3$Br which in the 2D layer can be viewed as strongly coupled alternating antiferromagnetic and ferromagnetic chains. In an applied magne
Externí odkaz:
http://arxiv.org/abs/2411.09541
Topology plays a cardinal role in explaining phases and quantum phase transitions beyond the Landau-Ginzburg-Wilson paradigm. In this study, we formulate a set of models of Dirac fermions in 2+1 dimensions with SU($N$)$\times$SU(2)$\times$U(1) symmet
Externí odkaz:
http://arxiv.org/abs/2410.05059
Autor:
Raczkowski, Marcin, Assaad, Fakher F.
Publikováno v:
Phys. Rev. B 109, 205154 (2024)
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
Externí odkaz:
http://arxiv.org/abs/2403.03694
Publikováno v:
Phys. Rev. B 106, L161115 (2022)
We show that for the half-filled Kondo lattice model on the honeycomb lattice a Kondo breakdown occurs at small Kondo couplings $J_k$ within the magnetically ordered phase. Our conclusions are based on auxiliary field quantum Monte Carlo simulations
Externí odkaz:
http://arxiv.org/abs/2206.14210
Publikováno v:
Phys. Rev. B 104, 155128 (2021)
Resolving the heavy fermion band in the conduction electron momentum resolved spectral function of the Kondo lattice model is challenging since, in the weak coupling limit, its spectral weight is exponentially small. In this article we consider a com
Externí odkaz:
http://arxiv.org/abs/2107.10272
Publikováno v:
Phys. Rev. B 103, 125137 (2021)
Using a cluster extension of the dynamical mean-field theory (CDMFT) we map out the magnetic phase diagram of the anisotropic square lattice Hubbard model with nearest-neighbor intrachain $t$ and interchain $t_{\perp}$ hopping amplitudes at half-fill
Externí odkaz:
http://arxiv.org/abs/2012.01444
Autor:
Raczkowski, Marcin, Assaad, Fakher F.
Publikováno v:
Phys. Rev. Research 2, 013276 (2020)
In heavy-fermion systems, the competition between the local Kondo physics and intersite magnetic fluctuations results in unconventional quantum critical phenomena which are frequently addressed within the Kondo lattice model (KLM). Here we study this
Externí odkaz:
http://arxiv.org/abs/1910.07540
Autor:
Raczkowski, Marcin, Peters, Robert, Phùng, Th\d{i} Thu, Takemori, Nayuta, Assaad, Fakher F., Honecker, Andreas, Vahedi, Javad
Publikováno v:
Phys. Rev. B 101, 125103 (2020)
We study the one-band Hubbard model on the honeycomb lattice using a combination of quantum Monte Carlo (QMC) simulations and static as well as dynamical mean-field theory (DMFT). This model is known to show a quantum phase transition between a Dirac
Externí odkaz:
http://arxiv.org/abs/1908.04307
Autor:
Raczkowski, Marcin, Assaad, Fakher F.
Publikováno v:
Phys. Rev. Lett. 122, 097203 (2019)
How many magnetic moments periodically arranged on a metallic surface are needed to generate a coherent Kondo lattice behavior? We investigate this fundamental issue within the particle-hole symmetric Kondo lattice model using quantum Monte Carlo sim
Externí odkaz:
http://arxiv.org/abs/1809.00930
Autor:
Raczkowski, Marcin, Assaad, Fakher F.
Publikováno v:
Phys. Rev. B 96, 115155 (2017)
We perform projective quantum Monte Carlo simulations of zigzag graphene nanoribbons within a realistic model with long-range Coulomb interactions. Increasing the relative strength of nonlocal interactions with respect to the on-site repulsion does n
Externí odkaz:
http://arxiv.org/abs/1707.02065