Proposed Low Energy Model Hamiltonian for Spin-gapped System Cute 2 O 5 : a Nmto-downfolding Study
نویسندگان
چکیده
Using muffin tin orbital (MTO) based NMTO-downfolding technique we analyze the electronic structure of the low-dimensional quantum spin system CuTe2O5 which has been recently investigated (J. Deisenhofer et al, Phys. Rev. B, 74 (2006) 174421) in terms of susceptibility and electron spin resonance measurements. Our study indicate that contrary to the findings by Deisenhofer et al, the system may be described as a two dimensional coupled dimer system, with different dominant interactions than those identified by Deisenhofer et al.
منابع مشابه
Developing the MTO Formalism
The TB-LMTO-ASA method is reviewed and generalized to an accurate and robust TB-NMTO minimal-basis method, which solves Schrödinger’s equation to Nth order in the energy expansion for an overlapping MT-potential, and which may include any degree of downfolding. For N = 1, the simple TBLMTO-ASA formalism is preserved. For a discrete energy mesh, the NMTO basis set may be given as: χ (r) = ∑ n φ ...
متن کاملResonating plaquette phases in SU(4) Heisenberg antiferromagnet
Large spin cold atom systems can exhibit magnetic properties that do not appear in usual spin-1 /2 systems. We investigate the SU 4 resonating plaquette state in the three-dimensional cubic optical lattice with spin-3 /2 cold fermions. A gauge field formalism is constructed to describe the Rokhsar–Kivelson type of Hamiltonian and a duality transformation is used to study the phase diagram. Due ...
متن کاملMagnon decay in gapped quantum spin systems.
In the continuum O(3) sigma-model description of gapped spin systems, S = 1 magnons can only decay into three lower energy magnons. We argue that the symmetry of the quantum spin Hamiltonian often allows decay into two magnons, and compute this decay rate in model systems. Two-magnon decay is present in Haldane gap S = 1 spin chains, even though it cannot be induced by any allowed term written ...
متن کاملSpin chain description of rotating bosons at ν = 1
We consider bosons at Landau level filling ν = 1 on a thin torus. In analogy with previous work on fermions at filling ν = 1/2, we map the low-energy sector onto a spin-1/2 chain. While the fermionic system may realize the gapless XYphase, we show that typically this does not happen for the bosonic system. Instead, both delta function and Coulomb interaction lead to gapped phases in the bosonic...
متن کاملUvA - DARE ( Digital Academic Repository ) Relaxation dynamics in the gapped XXZ spin - 1 / 2 chain
We study the dynamics of a quench-prepared domain wall state released into a system whose unitary time evolution is dictated by the Hamiltonian of the Heisenberg spin-1/2 gapped antiferromagnetic chain. Using exact wavefunctions and their overlaps with the domain wall state allows us to describe the release dynamics to high accuracy, up to the long-time limit, for finite as well as infinite sys...
متن کامل