Engineering topics
Dong, Ying
Publications and source records attributed to Dong, Ying.
Structural principles of B cell antigen receptor assembly
Not provided.
Crystallizing Kagome Artificial Spin Ice
Artificial spin ices are engineered arrays of dipolarly coupled nanobar magnets. They enable direct investigations of fascinating collective phenomena from their diverse microstates. However, experimental access to ground states in the geometrically frustrated systems has proven difficult, limiting studies and applications of novel properties and functionalities from the low energy states. In this work, we introduce a convenient approach to control the competing diploar interactions between the neighboring nanomagnets, allowing us to tailor the vertex degeneracy of the ground states. We achieve this by tuning the length of selected nanobar magnets in the spin ice lattice. We demonstrate the effectiveness of our method by realizing multiple low energy microstates in a kagome artificial spin ice, particularly the hardly accessible long range ordered ground state—the spin crystal state. Our strategy can be directly applied to other artificial spin systems to achieve exotic phases and explore new emergent collective behaviors.
Structure of cytoplasmic ring of nuclear pore complex by integrative cryo-EM and AlphaFold
The nuclear pore complex (NPC) is the conduit for bidirectional cargo traffic between the cytoplasm and the nucleus. We determined a near-complete structure of the cytoplasmic ring of the NPC from Xenopus oocytes using single-particle cryo–electron microscopy and AlphaFold prediction. Structures of nucleoporins were predicted with AlphaFold and fit into the medium-resolution map by using the prominent secondary structural density as a guide. Certain molecular interactions were further built or confirmed by complex prediction by using AlphaFold. Here, we identified the binding modes of five copies of Nup358, the largest NPC subunit with Phe-Gly repeats for cargo transport, and predicted it to contain a coiled-coil domain that may provide avidity to assist its role as a nucleation center for NPC formation under certain conditions
Writable spin wave nanochannels in an artificial-spin-ice-mediated ferromagnetic thin film
We report magnonics, which employs spin-waves to transmit and process information, is a promising venue for low-power data processing. One of the major challenges is the local control of the spin-wave propagation path. Here, we introduce the concept of writable magnonics by taking advantage of the highly flexible reconfigurability and rewritability of artificial spin ice systems. Using micromagnetic simulations, we show that globally switchable spin-wave propagation and locally writable spin-wave nanochannels can be realized in a ferromagnetic thin film underlying an artificial pinwheel spin ice. The rewritable magnonics enabled by reconfigurable spin wave nanochannels provides a unique setting to design programmable magnonic circuits and logic devices for ultra-low power applications.