Question

What does the term 'a uniform RVB spin-liquid state' mean?

Answer 1

Hey mate here is your answer

In condensed matter physics, quantum spin liquid is a state that can be achieved in a system of interacting quantum spins. ... It may correspond to a gapless spin liquid with spinon Fermi surface (the so-called uniform RVB state).

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Answer 2

These states are ground states of gapless models, although the SU(2)-invariant spin RVB state is also believed to be a gapped liquid in its spinful sector.