南京大学学者联合发表《Nature》:解锁光学制冷新路径!

近日，国际顶级期刊《自然》（Nature）刊发了由南京大学、清华大学、南方科技大学、东南大学、厦门大学及其相关科研研究所、实验室等18位学者联合发表的论文：Optical cooling by interfacial charge transfer in 2D heterostructures.

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标题

Optical cooling by interfacial charge transfer in 2D heterostructures

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摘要

Optical refrigeration, or laser cooling of solids, offers a cryogen-free route to temperature control for quantum and electronic systems. Existing progress relies on a phonon-assisted up-conversion photoluminescence approach, which remains constrained by stringent material and excitation requirements. Here we demonstrate a distinct route, interfacial-charge-transfer-driven optical cooling, in two-dimensional semiconductor heterostructures. Photo-excited carriers in WSe₂ cross a type-II junction into MoSe₂ or WS₂, extracting lattice energy nonradiatively—through a phonon-assisted interfacial charge transfer process. Raman and photoluminescence measurements show prominent low-temperature signatures in the WSe₂ layer, with transient absorption spectroscopy identifying a phonon-assisted, barrier-activated interlayer charge transfer. Molecular dynamics simulations show a prominent interfacial thermal resistance sustaining the temperature gradient. This barrier-mediated phonon extraction bypasses the need for near-unity quantum efficiency or resonant excitation, offering a promising strategy for cryogen-free refrigeration and thermal management in quantum, optoelectronic and nanoscale systems.

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