Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2008-07-11
Phys. Rev. B 80, 140402(R) (2009)
Physics
Condensed Matter
Strongly Correlated Electrons
4+ pages, 4 figures
Scientific paper
10.1103/PhysRevB.80.140402
We present the phase diagram of the frustrated ferromagnetic S=1/2 Heisenberg J_1-J_2 chain in a magnetic field, obtained by large scale exact diagonalizations and density matrix renormalization group simulations. A vector chirally ordered state, metamagnetic behavior and a sequence of spin-multipolar Luttinger liquid phases up to hexadecupolar kind are found. We provide numerical evidence for a locking mechanism, which can drive spiral states towards spin-multipolar phases, such as quadrupolar or octupolar phases. Our results also shed light on previously discovered spin-multipolar phases in two-dimensional $S=1/2$ quantum magnets in a magnetic field.
Laeuchli Andreas
Luscher Andreas
Sudan J.
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