Quantum phase diagram of a frustrated antiferromagnet on the bilayer honeycomb lattice
Autor: | Hao Zhang, Carlos Alberto Lamas, Marcelo José Fabián Arlego, Wolfram Brenig |
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Jazyk: | angličtina |
Rok vydání: | 2016 |
Předmět: |
Ciencias Físicas
media_common.quotation_subject FOS: Physical sciences Frustration 02 engineering and technology 01 natural sciences purl.org/becyt/ford/1 [https] Exact ground state Condensed Matter - Strongly Correlated Electrons Quantum phase diagram Lattice (order) 0103 physical sciences Antiferromagnetism Singlet state 010306 general physics magnetismo cuántico Valence bond solid Phase diagram media_common Physics Strongly Correlated Electrons (cond-mat.str-el) Condensed matter physics Bilayer Física purl.org/becyt/ford/1.3 [https] 021001 nanoscience & nanotechnology Astronomía Quantum magnetism Condensed Matter::Strongly Correlated Electrons 0210 nano-technology Ground state Series expansion CIENCIAS NATURALES Y EXACTAS |
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 |
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