Quantum phase diagram of a frustrated antiferromagnet on the bilayer honeycomb lattice

Autor: Hao Zhang, Carlos Alberto Lamas, Marcelo José Fabián Arlego, Wolfram Brenig
Jazyk: angličtina
Rok vydání: 2016
Předmět:
Zdroj: SEDICI (UNLP)
Universidad Nacional de La Plata
instacron:UNLP
CONICET Digital (CONICET)
Consejo Nacional de Investigaciones Científicas y Técnicas
instacron:CONICET
Popis: We study the spin-1/2 Heisenberg antiferromagnet on a bilayer honeycomb lattice including interlayer frustration. Using a set of complementary approaches, namely Schwinger bosons, dimer series expansion, bond operators, and exact diagonalization, we map out the quantum phase diagram. Analyzing ground state energies and elementary excitation spectra, we find four distinct phases, corresponding to three collinear magnetic long range ordered states, and one quantum disordered interlayer dimer phase. We detail, that the latter phase is adiabatically connected to an "exact" singlet product ground state of the the bilayer which exists along a line of maximum interlayer frustration. The order within the remaining three phases will be clarified.
12 pages, 12 figures
Databáze: OpenAIRE