Zhang Kunyan, Maniyara Rinu Abraham, Wang Yuanxi, Jain Arpit, Wetherington Maxwell T, Mai Thuc T, Dong Chengye, Bowen Timothy, Wang Ke, Rotkin Slava V, Hight Walker Angela R, Crespi Vincent H, Robinson Joshua, Huang Shengxi
Department of Chemistry, University of California, Berkeley, CA 94720, USA.
Molecular Biophysics and Integrated Bioimaging Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
Sci Adv. 2025 Aug 8;11(32):eadw1800. doi: 10.1126/sciadv.adw1800. Epub 2025 Aug 6.
Harnessing quantum interference among bosons provides opportunities due to their longer coherence time than fermions. Fano resonance, an example of quantum interference between discrete and continuous states, is marked by an asymmetric lineshape. While photon-based Fano resonance has enabled high-sensitivity molecule sensing, phonon-based Fano resonance remains underexplored because of ineffective interference between discrete phonons and electronic continuum. In this work, we report phonon-based Fano resonance in a graphene/2D Ag/SiC heterostructure, arising from frequency and lifetime matching between discrete and continuous phonons of SiC. The observed Fano asymmetry is tunable over two orders of magnitude, surpassing previously reported phonon-based systems. The 2D Ag layer restructures the interfacial SiC and facilitates resonant scattering to enhance Fano asymmetry, which is unattainable in conventional Ag. We further demonstrated that this Fano resonance allows ultrasensitive molecule detection at the single-molecule level. Our work highlights phonon-based Fano resonance, opening avenues for engineering quantum interference with phonons.
与费米子相比，玻色子具有更长的相干时间，利用玻色子之间的量子干涉可带来诸多机遇。法诺共振是离散态与连续态之间量子干涉的一个例子，其特征为不对称的线形。基于光子的法诺共振已实现了高灵敏度的分子传感，但基于声子的法诺共振由于离散声子与电子连续体之间的干涉效率低下，仍未得到充分探索。在这项工作中，我们报道了在石墨烯/二维银/碳化硅异质结构中基于声子的法诺共振，它源于碳化硅离散声子与连续声子之间的频率和寿命匹配。所观察到的法诺不对称性可在两个数量级范围内调节，超过了此前报道的基于声子的系统。二维银层重构了界面碳化硅并促进共振散射，以增强法诺不对称性，这在传统银中是无法实现的。我们进一步证明，这种法诺共振能够在单分子水平实现超灵敏的分子检测。我们的工作突出了基于声子的法诺共振，为利用声子进行量子干涉工程开辟了道路。
