Ground-State Properties of the Spin-1/2 Heisenberg-Ising Bond Alternating Chain with Dzyaloshinskii-Moriya Interaction |
| J. Strečka a, L. Gálisová b and O. Derzhko c
aDepartment of Theoretical Physics and Astrophysics, Faculty of Science, P.J. Šafárik University, Park Angelinum 9, 040 01 Košice, Slovak Republic bDepartment of Applied Mathematics, Faculty of Mechanical Engineering, Technical University, Letná 9, 042 00 Košice, Slovak Republic cInstitute for Condensed Matter Physics, National Academy of Sciences of Ukraine, 1 Svientsitskii Str., L'viv-11, 79011, Ukraine |
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| Ground-state energy is exactly calculated for the spin-1/2 Heisenberg-Ising bond alternating chain with the Dzyaloshinskii-Moriya interaction. Under certain condition, which relates a strength of the Ising, Heisenberg and Dzyaloshinskii-Moriya interactions, the ground-state energy exhibits an interesting nonanalytic behavior accompanied with a gapless excitation spectrum. |
| DOI: 10.12693/APhysPolA.118.742 PACS numbers: 05.50.+q, 05.70.Jk, 64.60.De, 75.10.Pq |