Kondo physics: It was assumed since 1960s that iron impurities in niobium cannot retain their magnetic moment (due to a large density of states at Fermi surface of the host metal). Thus it was a surprise that we found a Kondo effect in granular films of Nb: Hansong Zeng, Dan Zhou, Guoqing Liang, Rujun Tang, Zhi H. Hang, Zhiwei Hu, Zixi Pei & X. S. Ling, Kondo effect and superconductivity in niobium with iron impurities, Scientific Reports, 11, 14256 (2021).
The second direction of exploration is to investigate edge dislocation dynamics in 2D colloidal lattices, also by experiments and theoretical modeling. Edge dislocations are crucial for understanding the mechanics of solids. It has proposed theoretically that an array of edge dislocations formed along a lowangle grain boundary (LAGB) can have a novel melting transition of its own, while deeply connected to the 2D melting problem. The PIs propose to create a colloidal version of the LAGB system such that one can study the statistical mechanics of the edge dislocations. In addition to experimentally testing the theoretical predictions of 1D melting of dislocation arrays, the PIs also plan to investigate the interactions between a 1D LAGB dislocation lattice and impurities particles to observe possible a 1D glassy state.
Daniel Y. Ling and Xinsheng Sean Ling, "On the distribution of DNA translocation times in solid-state nanopores: an analysis using Schrödinger's first-passage-time theory", J. Phys.: Cond. Matt. 25, 375102 (2013).
In condensed matter physics and materials science, an amorphous solid (or non-crystalline solid) is a solid that lacks the long-range order that is characteristic of a crystal. The terms "glass" and "glassy solid" are sometimes used synonymously with amorphous solid; however, these terms refer specifically to amorphous materials that undergo a glass transition. Examples of amorphous solids include glasses, metallic glasses, and certain types of plastics and polymers. 2b1af7f3a8