Honeycomb oxide heterostructure: a new platform for Kitaev quantum spin liquid

Kitaev quantum spin liquid, massively quantum entangled states, is so scarce in nature that searching for new candidate systems remains a great challenge. Honeycomb heterostructure could be a promising route to realize and utilize such an exotic quantum phase by providing additional controllability of Hamiltonian and device compatibility, respectively. Here, we provide epitaxial honeycomb oxide thin film Na3Co2SbO6, a candidate of Kitaev quantum spin liquid proposed recently. We found a spin glass and antiferromagnetic ground states depending on Na stoichiometry, signifying not only the importance of Na vacancy control but also strong frustration in Na3Co2SbO6. Despite its classical ground state, the field-dependent magnetic susceptibility shows remarkable scaling collapse with a single critical exponent, which can be interpreted as evidence of quantum criticality. Its electronic ground state and derived spin Hamiltonian from spectroscopies are consistent with the predicted Kitaev model. Our work provides a unique route to the realization and utilization of Kitaev quantum spin liquid

Primary Production in the Yellow Sea Determined by Ocean Color Remote Sensing

The Yellow Sea is a shelf sea surrounded by the Korean peninsula and the eastern coast of China. The bordering countries derive a substantial share of their food from fishing in these coastal waters. Synoptic maps of water-column integrated primary production in May and September were derived using a primary production algorithm applied to ocean color satellite data from the Yellow Sea from 1998 to 2003. The middle of the Yellow Sea (MYS) had higher levels of primary production in May and September than the shallower (<50 m) areas off the coasts of Korea and China. Although the coastal areas had high phytoplankton biomass, lower levels of primary production were caused by high turbidity arising from strong tides and shallow depths. Lower turbidity in the central part of the Yellow Sea allows light necessary for primary production to penetrate deeper into the water column. The mean daily integrated primary production in the MYS was 947 mg C m2 d 1 in May and723 mg C m-2d-1 in September. The mean values in Chinese and Korean coastal waters were 590and 589 mg C-m-2 d 1 in May, and 734 and 553 mg C-m-2d 1 in September, respectively. Our computation of daily total primary production for the entire Yellow Sea was 19.7 ×104t C d - 1 in May, and 15.8 ×104t C d-1 in September.JRC.H.5-Rural, water and ecosystem resource

Transcriptional regulation of dopamine D1 receptor by DISC1-DRRF repressor complex

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