Saved in:
| Main Authors: | , , , , , , , , , , , , , , , , , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2026
|
| Subjects: | |
| Online Access: | https://arxiv.org/abs/2601.19988 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866908793127829504 |
|---|---|
| author | Zhou, Xuankai Kong, Yan-Tung Cheung, Cheuk Kit Bian, Guodong Moukaouine, Reda Wong, King Cho Sun, Yumeng Ho, Cheng-I Bushmakin, Vladislav Gross, Nils Yen, Chun-Chieh Priessnitz, Tim Lenger, Malik Jayaram, Sreehari Taniguchi, Takashi Watanabe, Kenji Pershin, Anton Peng, Ruoming Gali, Ádám Smet, Jurgen Wrachtrup, Jörg |
| author_facet | Zhou, Xuankai Kong, Yan-Tung Cheung, Cheuk Kit Bian, Guodong Moukaouine, Reda Wong, King Cho Sun, Yumeng Ho, Cheng-I Bushmakin, Vladislav Gross, Nils Yen, Chun-Chieh Priessnitz, Tim Lenger, Malik Jayaram, Sreehari Taniguchi, Takashi Watanabe, Kenji Pershin, Anton Peng, Ruoming Gali, Ádám Smet, Jurgen Wrachtrup, Jörg |
| contents | Optically addressable spins at material surfaces have represented a long-standing ambition in quantum sensing, providing atomic resolution and quantum-limited sensitivity. However, they are constrained by a finite depth at which the quantum spins can be stabilized. Here, we demonstrate a hybrid molecular-2D architecture that realizes quantum spin sensors directly on top of the surface. By anchoring spin-active molecules onto hexagonal boron nitride (hBN), we eliminate the depth of the quantum sensor while also exhibiting robust spin properties from 4~K to room temperature (RT). The Hahn-echo spin coherence time exceeds \(T_2 = 3.4~\upmu\text{s}\) at 4~K, outperforming values in bulk organic crystals and overturning the prevailing expectation that spin inevitably deteriorates upon approaching the surface. By chemically tuning the molecule through deuteration, \(T_2\) improves by more than 10-fold, and under dynamic decoupling, coherence is prolonged to the intrinsic lifetime limit, exceeding 300~\(\upmu\text{s}\). Proximal proton spins and the magnetic response of two-dimensional magnets beneath the hBN layer have been detected at RT. These molecular spins form surface quantum sensors with long coherence, optical addressability, and interfacial versatility, enabling a scalable, adaptable architecture beyond what conventional solid-state platforms offer. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_19988 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Optically Addressable Molecular Spins at 2D Surfaces Zhou, Xuankai Kong, Yan-Tung Cheung, Cheuk Kit Bian, Guodong Moukaouine, Reda Wong, King Cho Sun, Yumeng Ho, Cheng-I Bushmakin, Vladislav Gross, Nils Yen, Chun-Chieh Priessnitz, Tim Lenger, Malik Jayaram, Sreehari Taniguchi, Takashi Watanabe, Kenji Pershin, Anton Peng, Ruoming Gali, Ádám Smet, Jurgen Wrachtrup, Jörg Quantum Physics Materials Science Optically addressable spins at material surfaces have represented a long-standing ambition in quantum sensing, providing atomic resolution and quantum-limited sensitivity. However, they are constrained by a finite depth at which the quantum spins can be stabilized. Here, we demonstrate a hybrid molecular-2D architecture that realizes quantum spin sensors directly on top of the surface. By anchoring spin-active molecules onto hexagonal boron nitride (hBN), we eliminate the depth of the quantum sensor while also exhibiting robust spin properties from 4~K to room temperature (RT). The Hahn-echo spin coherence time exceeds \(T_2 = 3.4~\upmu\text{s}\) at 4~K, outperforming values in bulk organic crystals and overturning the prevailing expectation that spin inevitably deteriorates upon approaching the surface. By chemically tuning the molecule through deuteration, \(T_2\) improves by more than 10-fold, and under dynamic decoupling, coherence is prolonged to the intrinsic lifetime limit, exceeding 300~\(\upmu\text{s}\). Proximal proton spins and the magnetic response of two-dimensional magnets beneath the hBN layer have been detected at RT. These molecular spins form surface quantum sensors with long coherence, optical addressability, and interfacial versatility, enabling a scalable, adaptable architecture beyond what conventional solid-state platforms offer. |
| title | Optically Addressable Molecular Spins at 2D Surfaces |
| topic | Quantum Physics Materials Science |
| url | https://arxiv.org/abs/2601.19988 |