Quantum Light Emission from Coupled Defect States in DNA-Functionalized Carbon Nanotubes
Quantum Light Emission from Coupled Defect States in DNA-Functionalized Carbon Nanotubes
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DOI：
10.1021/acsnano.1c02709
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发表时间：
2021-06-01
期刊：
影响因子：
17.1
通讯作者：
Htoon, Han
中科院分区：
文献类型：
--
作者：
Zheng, Yu;Kim, Younghee;Htoon, Han
固态单光子源是量子光子学和量子信息技术的重要组成部分。这项研究展示了单壁碳纳米管(SWCNTs)通过与其单链DNA涂层中的鸟嘌呤核苷酸发生共价反应而产生的量子缺陷的单光子发射。对单个鸟嘌呤功能化的单壁碳纳米管(GF-SWCNTs)的低温光致发光光谱和光子相关测量表明，单个单链DNA中多个紧密分布的鸟嘌呤缺陷位共同形成激子捕获势，支持能够室温单光子发射的局域量子态。此外，来自相邻单链的激子陷阱是弱耦合的，从而给出了它们各自的光子发射之间的交叉关联。理论模型将耦合机制确定为对带边激子的捕获。由于选择单链DNA碱基序列可以很容易地控制纳米管功能化位点的空间格局，因此GF-SWCNTs应该成为一种具有工程性质的多功能量子光发射体家族。
Solid-state single-photon sources are essential building blocks for quantum photonics and quantum information technologies. This study demonstrates promising single-photon emission from quantum defects generated in single-wall carbon nanotubes (SWCNTs) by covalent reaction with guanine nucleotides in their single-stranded DNA coatings. Low-temperature photoluminescence spectroscopy and photon-correlation measurements on individual guanine-functionalized SWCNTs (GF-SWCNTs) indicate that multiple, closely spaced guanine defect sites within a single ssDNA strand collectively form an exciton trapping potential that supports a localized quantum state capable of room-temperature single-photon emission. In addition, exciton traps from adjacent ssDNA strands are weakly coupled to give cross-correlations between their separate photon emissions. Theoretical modeling identifies coupling mechanism as a capture of band-edge excitons. Because the spatial pattern of nanotube functionalization sites can be readily controlled by selecting ssDNA base sequences, GF-SWCNTs should become a versatile family of quantum light emitters with engineered properties.