Zobrazeno 1 - 10
of 28
pro vyhledávání: '"Fjærestad, J. O."'
The one-dimensional flat-band ferromagnetic Tasaki model exhibits spontaneous symmetry breaking from ${\rm SU}(2)$ to ${\rm U}(1)$ with one type-B Goldstone mode, featuring that the highest weight state is entangled at quarter filling, but there is a
Externí odkaz:
http://arxiv.org/abs/2412.15724
Autor:
Bauer, Dag-Vidar, Fjærestad, J. O.
Publikováno v:
Phys. Rev. B 101, 195124 (2020)
We use modified linear spin-wave theory (MLSWT) to study ground-state entanglement for a length-$L$ line subsystem in $L\times L$ square- and triangular-lattice quantum Heisenberg antiferromagnets with coplanar spiral magnetic order with ordering vec
Externí odkaz:
http://arxiv.org/abs/2005.07745
Autor:
Bauer, Dag-Vidar, Fjærestad, J. O
Publikováno v:
Phys. Rev. B 96, 165141 (2017)
We use Schwinger boson mean field theory (SBMFT) to study the ground state of the spin-$S$ triangular-lattice Heisenberg model with nearest ($J_1$) and next-nearest ($J_2$) neighbor antiferromagnetic interactions. Previous work on the $S=1/2$ model l
Externí odkaz:
http://arxiv.org/abs/1710.08720
Autor:
Fjaerestad, J. O.
We show that the number Z of q-edge-colourings of a simple regular graph of degree q is deducible from functions describing dimers on the same graph, viz. the dimer generating function or equivalently the set of connected dimer correlation functions.
Externí odkaz:
http://arxiv.org/abs/1109.0157
Autor:
Fjaerestad, J. O.
Publikováno v:
J. Stat. Mech. (2010) P01004
We consider the problem of counting the number of 3-colourings of the edges (bonds) of the 4-8 lattice and the 3-12 lattice. These lattices are Archimedean with coordination number 3, and can be regarded as decorated versions of the square and honeyc
Externí odkaz:
http://arxiv.org/abs/0909.1396
Publikováno v:
Nature Phys. 5, 422 (2009)
Discoveries of ratios whose values are constant within broad classes of materials have led to many deep physical insights. The Kadowaki-Woods ratio (KWR) compares the temperature dependence of a metal's resistivity to that of its heat capacity; there
Externí odkaz:
http://arxiv.org/abs/0805.4275
Publikováno v:
Phys. Rev. B 72, 075126 (2005)
We determine the phase diagram of the half-filled two-leg ladder both at weak and strong coupling, taking into account the Cu d_{x^2-y^2} and the O p_x and p_y orbitals. At weak coupling, renormalization group flows are interpreted with the use of bo
Externí odkaz:
http://arxiv.org/abs/cond-mat/0503380
Publikováno v:
Ann. Phys. (N.Y.) 321, 894 (2006)
We study a generalized Hubbard model on the two-leg ladder at zero temperature, focusing on a parameter region with staggered flux (SF)/d-density wave (DDW) order. To guide our numerical calculations, we first investigate the location of a SF/DDW pha
Externí odkaz:
http://arxiv.org/abs/cond-mat/0412709
Publikováno v:
Phys. Rev. Lett. 90, 186401 (2003).
We provide, for the first time, in a doped strongly correlated system (two-leg ladder), a controlled theoretical demonstration of the existence of a state in which long-range ordered orbital currents are arranged in a staggered pattern,coexisting wit
Externí odkaz:
http://arxiv.org/abs/cond-mat/0209444
Publikováno v:
Phys. Rev. Lett. 89, 056404 (2002)
We present numerical evidence for the existence of a staggered flux (SF) phase in the half-filled two-leg t-U-V-J ladder, with true long-range order in the counter-circulating currents. The density-matrix renormalization-group (DMRG) / finite-size sc
Externí odkaz:
http://arxiv.org/abs/cond-mat/0202188