Frustrated spin-12J1−J2Heisenberg ferromagnet on the square lattice studied via exact diagonalization and coupled-cluster method
نویسندگان
چکیده
منابع مشابه
The spin - 1 / 2 J 1 - J 2 Heisenberg antiferromagnet on the square lattice : Exact diagonalization for N = 40 spins
We present numerical exact results for the ground state and the low-lying excitations for the spin-1/2 J 1-J 2 Heisenberg antiferromagnet on finite square lattices of up to N = 40 sites. Using finite-size extrapolation we determine the ground-state energy, the magnetic order parameters, the spin gap, the uniform susceptibility, as well as the spin-wave velocity and the spin stiffness as functio...
متن کاملSpin-Ice and Other Frustrated Magnets on the Pyrochlore Lattice
The recent identification of the dysprosium titanate compound Dy2T i2O7 as a “Spin-Ice”, i.e. the spin analog of regular entropic ice of Pauling, has created considerable excitement. The ability to manipulate spins using magnetic fields gives a unique advantage over regular ice in these systems, and has been used to study the recovery of entropy. Predicted magnetization plateaus have been obser...
متن کاملNematic order in square lattice frustrated ferromagnets.
We present a new scenario for the breakdown of ferromagnetic order in a two-dimensional quantum magnet with competing ferromagnetic and antiferromagnetic interactions. In this, dynamical effects lead to the formation of two-magnon bound states, which undergo Bose-Einstein condensation, giving rise to bond-centered nematic order. This scenario is explored in some detail for an extended Heisenber...
متن کاملFrustrated Quantum Antiferromagnets: Application of High-order Coupled Cluster Method
We report on recent results for strongly frustrated quantum J1–J2 antiferromagnets in dimensionality d = 1, 2, 3 obtained by the coupled cluster method (CCM). We demonstrate that the CCM in high orders of approximation allows us to investigate quantum phase transitions driven by frustration and to discuss novel quantum ground states. In detail we consider the ground-state properties of (i) the ...
متن کاملExact diagonalization of quantum lattice models on coprocessors
We implement the Lanczos algorithm on an Intel Xeon Phi coprocessor and compare its performance to a multi-core Intel Xeon CPU and an NVIDIA graphics processor. The Xeon and the Xeon Phi are parallelized with OpenMP and the graphics processor is programmed with CUDA. The performance is evaluated by measuring the execution time of a single step in the Lanczos algorithm. We study two quantum latt...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Physical Review B
سال: 2010
ISSN: 1098-0121,1550-235X
DOI: 10.1103/physrevb.81.174429