% IMPORTANT: The following is UTF-8 encoded.  This means that in the presence
% of non-ASCII characters, it will not work with BibTeX 0.99 or older.
% Instead, you should use an up-to-date BibTeX implementation like “bibtex8” or
% “biber”.

@ARTICLE{Raczkowski:885470,
      author       = {Raczkowski, Marcin and Assaad, Fakher F.},
      title        = {{P}hase diagram and dynamics of the ${SU}({N})$ symmetric
                      {K}ondo lattice model},
      journal      = {Physical review research},
      volume       = {2},
      number       = {1},
      issn         = {2643-1564},
      address      = {College Park, MD},
      publisher    = {APS},
      reportid     = {FZJ-2020-03853},
      pages        = {013276},
      year         = {2020},
      abstract     = {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 interplay in the SU(N) symmetric
                      generalization of the two-dimensional half-filled KLM by
                      quantum Monte Carlo simulations with N up to 8. While the
                      long-range antiferromagnetic (AF) order in SU(N) quantum
                      spin systems typically gives way to spin-singlet ground
                      states with spontaneously broken lattice symmetry, we find
                      that the SU(N) KLM is unique in that for each finite N its
                      ground-state phase diagram hosts only two phases—AF order
                      and the Kondo-screened phase. The absence of any
                      intermediate phase between the N=2 and large-N cases
                      establishes adiabatic correspondence between both limits and
                      confirms that the large-N theory is a correct saddle point
                      of the KLM fermionic path integral and a good starting point
                      to include quantum fluctuations. In addition, we determine
                      the evolution of the single-particle gap, quasiparticle
                      residue of the doped hole at momentum $(π,π)$, and spin
                      gap across the magnetic order-disorder transition. Our
                      results indicate that increasing N modifies the behavior of
                      the coherence temperature: while it evolves smoothly across
                      the magnetic transition at N=2 it develops an abrupt
                      jump—of up to an order of magnitude—at larger but finite
                      N. We discuss the magnetic order-disorder transition from a
                      quantum-field-theoretic perspective and comment on
                      implications of our findings for the interpretation of
                      experiments on quantum critical heavy-fermion compounds.},
      ddc          = {530},
      pnm          = {899 - ohne Topic (POF4-899) / Numerical simulations of
                      strongly correlated electron systems. $(hwb03_20190501)$},
      pid          = {G:(DE-HGF)POF4-899 / $G:(DE-Juel1)hwb03_20190501$},
      typ          = {PUB:(DE-HGF)16},
      doi          = {10.1103/PhysRevResearch.2.013276},
      url          = {https://juser.fz-juelich.de/record/885470},
}