Other Research Topics
Other Research Topics
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Non-Hermitian cooling.
Photons can also drive non-Hermiticity. In contrast to many previous studies that concentrated on non-Hermiticity-induced amplification of signals, I put forward the non-Hermiticity-induced suppression of thermal excitations, leading to the non-Hermitian cooling effect8. Notably, thermal excitations can be exponentially cooled down in a non-Hermitian chain, albeit with a lower bound that depends on the dissipative interaction with the environment.
Related publications:
Haowei Xu, Uroš Delić, Guoqing Wang, Changhao Li, Paola Cappellaro, and Ju Li, Exponentially Enhanced non-Hermitian Cooling. Physical Review Letters 132, 110402 (2024)
Materials Genome search for In-reactor Helium absorber
The realization of fusion energy requires structural materials that can withstand the harsh environments in the reactors. The structural materials often transmutate under fusion environments, producing helium (He), which embrittles grain boundaries. Adding nanodispersions as sacrificial He sinks has helped combat He embrittlement. We use several "easy-to-compute" criteria to target compounds expected to be compelling He-absorbing nano-phases.
Related publications:
Haowei Xu*, So Yeon Kim*, Cheng Sun, and Ju Li, Materials Genomics Search of Possible Helium-Absorbing Nano-Phases in Fusion Structural Materials. Adv. Sci. 9, 2203555 (2022)
Materials Genome Search for High Tc BCS Superconductors
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