BACKGROUND Years ago, Lev Landau taught us how to think about distinct phases of
matter through an order parameter that characterizes the symmetry-broken state relative to …

This is an introductory review of the physics of quantum spin liquid states. Quantum
magnetism is a rapidly evolving field, and recent developments reveal that the ground states …

Quantum spin liquids may be considered'quantum disordered'ground states of spin systems,
in which zero-point fluctuations are so strong that they prevent conventional magnetic long …

We analyze the effect of quenched disorder on spin-1/2 quantum magnets in which
magnetic frustration promotes the formation of local singlets. Our results include a theory for …

Quantum spin liquid (QSL) is a novel state of matter which refuses the conventional spin
freezing even at 0 K. Experimentally searching for the structurally perfect candidates is a big …

Disordered magnetic states known as spin liquids are of paramount importance in both
fundamental and applied science. A classical state of this kind was predicted for the Ising …

Muon spin relaxation (μ SR) experiments on single crystals of the structurally perfect
triangular antiferromagnet YbMgGaO 4 indicate the absence of both static long-range …

A quantum spin liquid state has long been predicted to arise in spin-1/2 Heisenberg square-
lattice antiferromagnets at the boundary region between Néel (nearest-neighbor interaction …

A recent focus of quantum spin liquid (QSL) studies is how disorder/randomness in a QSL
candidate affects its true magnetic ground state. The ultimate question is whether the QSL …

A quantum spin liquid (QSL) is an exotic state of matter characterized by quantum
entanglement and the absence of any broken symmetry. A longstanding open problem …