English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The quantum dimer magnet (QDM) is the canonical example of quantum magnetism.The QDM state consists of entangled nearest-neighbor spin dimers and oftenexhibits a field-induced triplon Bose-Einstein condensate (BEC) phase. Wereport on a new QDM in the strongly spin-orbit coupled, distortedhoneycomb-lattice material Yb$_2$Si$_2$O$_7$. Our single crystal neutronscattering, specific heat, and ultrasound velocity measurements reveal a gappedsinglet ground state at zero field with sharp, dispersive excitations. We finda field-induced magnetically ordered phase reminiscent of a BEC phase, withexceptionally low critical fields of $H_{c1} \sim 0.4$ T and $H_{c2} \sim 1.4$T. Using inelastic neutron scattering in an applied magnetic field we observe aGoldstone mode (gapless to within $\delta E$ = 0.037 meV) that persiststhroughout the entire field-induced magnetically ordered phase, suggestive ofthe spontaneous breaking of U(1) symmetry expected for a triplon BEC. However,in contrast to other well-known cases of this phase, the high-field($\mu$$_0$$H\geq1.2$T) part of the phase diagram in Yb$_2$Si$_2$O$_7$ isinterrupted by an unusual regime signaled by a change in the field dependenceof the ultrasound velocity and magnetization, as well as the disappearance of asharp anomaly in the specific heat. These measurements raise the question ofhow anisotropy in strongly spin-orbit coupled materials modifies the fieldinduced phases of QDMs.

Novel Strongly Spin-Orbit Coupled Quantum Dimer Magnet: Yb$_2$Si$_2$O$_7$