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- W2153788897 abstract "Quantum spin chains display complex cooperative phenomena that can be explored in considerable detail through theory, numerical simulations, and experiments. Here we review neutron scattering experiments that probe quantum spin chains in high magnetic fields. Experiments on copper-containing organometallic systems show that the uniform antiferromagnetic spin-1/2 chain has a gapless continuum of magnetic excitations and is critical in zero field. Application of a magnetic field creates incommensurate soft modes with a characteristic wave-vector that grows in proportion to the magnetization. These experimental results are evidence that the spins-1/2 chain maps to a one dimensional Luttinger liquid. Experiments on antiferromagnetic spin chains built from spin-1 nickel atoms show a Haldane gap to bound triplet excitations and a finite critical field that must be exceeded to induce magnetization at low temperatures. These results indicate that the integer spin chain has an isolated singlet ground state with hidden topological order. For both spin-1/2 and spin-1 systems, site alternation leads to a field induced gap in the excitation spectrum." @default.
- W2153788897 created "2016-06-24" @default.
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- W2153788897 date "2002-01-01" @default.
- W2153788897 modified "2023-09-25" @default.
- W2153788897 title "Magnetized States of Quantum Spin Chains" @default.
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