Abstract
In SU(2)-invariant spin models with frustrated interactions and low spin quantum number, long-ranged magnetic order and breaking of the SU(2) symmetry is not the most general situation, especially in low dimensions. Many such systems are, loosely speaking, “quantum paramagnets” down to zero temperature, states conveniently represented in terms of spins paired into rotationally invariant singlets, or “valence bonds” (VBs). In this large family of states, at least two very different physical phases should be distinguished, valence bond crystals (or solids) and resonating-valence-bond (RVB) liquids.
This chapter provides a basic introduction to the concept of short-range resonating-valence-bond (srRVB) states, and emphasizes the qualitative differences between VB crystals and RVB liquids. We explain in simple terms why the former sustain only integer-spin excitations while the latter possess \(\rm spin-\frac{1} {2}\) excitations (the property of fractionalization). We then elaborate qualitatively on the notion of macroscopic quantum resonances, which are behind the ‘R’ of the RVB spin liquid, to motivate the idea that spin liquids are not disordered systems but possess instead hidden quantum order parameters. After giving a brief list of models and materials of current interest as candidate spin liquids, we conclude by mentioning the role of the parity of the net spin in the unit cell (half-odd-integer or integer) in spin-liquid formation, by recalling the contrasting results for kagomé and pyrochlore lattices.
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Lhuillier, C., Misguich, G. (2011). Introduction to Quantum Spin Liquids. In: Lacroix, C., Mendels, P., Mila, F. (eds) Introduction to Frustrated Magnetism. Springer Series in Solid-State Sciences, vol 164. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-10589-0_2
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