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- W3172406403 abstract "We discuss zero-temperature quantum spin chains in a uniform magnetic field, with axial symmetry. For integer or half-integer spin, $S$, the magnetization curve can have plateaus and we argue that the magnetization per site $m$ is topologically quantized as $n(Sensuremath{-}m)phantom{rule{0ex}{0ex}}=phantom{rule{0ex}{0ex}}mathrm{integer}$ at the plateaus, where $n$ is the period of the ground state. We also discuss conditions for the presence of the plateau at those quantized values. For $Sphantom{rule{0ex}{0ex}}=phantom{rule{0ex}{0ex}}3/2$ and $mphantom{rule{0ex}{0ex}}=phantom{rule{0ex}{0ex}}1/2$, we study several models and find two distinct types of massive phases at the plateau. One of them is argued to be a ``Haldane gap phase'' for half-integer $S$." @default.
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- W3172406403 date "1997-03-01" @default.
- W3172406403 modified "2023-10-01" @default.
- W3172406403 title "Magnetization plateaus in spin chains: ``Haldane gap'' for half-integer spins" @default.
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