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As one of the most promising Kitaev quantum-spin-liquid (QSL) candidates,$\alpha$-RuCl$_3$ has received a great amount of attention. However, its groundstate exhibits a long-range zigzag magnetic order, which defies the QSL phase.Nevertheless, the magnetic order is fragile and can be completely suppressed byapplying an external magnetic field. Here, we explore the evolution of magneticexcitations of $\alpha$-RuCl$_3$ under an in-plane magnetic field, by carryingout inelastic neutron scattering measurements on high-quality single crystals.Under zero field, there exist spin-wave excitations near the $M$ point and acontinuum near the $\mit\Gamma$ point, which are believed to be associated withthe zigzag magnetic order and fractional excitations of the Kitaev QSL state,respectively. By increasing the magnetic field, the spin-wave excitationsgradually give way to the continuous excitations. On the verge of the criticalfield $\mu_0H_{\rm c}=7.5$ T, the former vanish and only the latter is left,indicating the emergence of a pure QSL state. By further increasing the fieldstrength, the excitations near the $\mit\Gamma$ point become more intense. Byfollowing the gap evolution of the excitations near the $\mit\Gamma$ point, weare able to establish a phase diagram composed of three interesting phases,including a gapped zigzag order phase at low fields, possibly-gapless QSL phasenear $\mu_0H_{\rm c}$, and gapped partially polarized phase at high fields.These results demonstrate that an in-plane magnetic field can drive$\alpha$-RuCl$_3$ into a long-sought QSL state near the critical field.

Neutron spectroscopy evidence for a possible magnetic-field-induced gapless quantum-spin-liquid phase in a Kitaev material $\alpha$-RuCl$_3$