Decoherence in molecular nanomagnets

分子纳米磁体的退相干

• 批准号: 1508661
• 负责人: Susumu Takahashi
• 金额: $ 30.46万
• 依托单位: University of Southern California
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-07-01 至 2019-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1508661&HistoricalAwards=false
• 关键词: Decoherence; molecular; nanomagnets

Nontechnical Abstract:Molecular nanomagnets are nanometer scale magnets that produce a large magnetic field. Because of the quantum nature in their magnetism and capability to tune their magnetic properties, molecular nanomagnets are promising materials for future applications of nano-scale magnetic storage and quantum information processing devices. This project entails a research plan that integrates the investigation and control of quantum memory time, known as quantum decoherence time, in molecular nanomagnets with innovative inter-disciplinary educational and outreach activities centered at the University of Southern California (USC). The research activities focus on revealing the origin of quantum decoherence in molecular nanomagnets using unique magnetic resonance techniques to significantly improve quantum coherence. Furthermore, the project incorporates educational activities including research training and curriculum developments for USC graduate and undergraduate students as well as science experiences and outreach activities for high school and elementary school students in the neighborhood community of USC with a high concentration of under-represented population in STEM fields.Technical Abstract:This project aims to investigate and control quantum coherence in molecular nanomagnets. Quantum decoherence has become one of the most pressing problems in many solid-state spin systems. Among the solid-state systems, molecular nanomagnets are excellent testbed for understanding nanomagnetism and for applications to dense magnetic storage and quantum spintronics devices because of their nanoscale size, quantum nature in the magnetism, physical and chemical stability, and capability to tune the magnetic properties and couplings to surrounding environments. In this research project, the principle investigator plans to investigates the nature of quantum decoherence in molecular magnets using novel magnetic resonance techniques to demonstrate long quantum coherence. Success in the proposed work will provide a promising pathway for developing molecular nanomagnets with desired coherent properties and setting a general platform for future science on molecular nanomagnet-based spin devices. Furthermore, the project incorporates educational activities including research training and curriculum developments for USC graduate and undergraduate students as well as science experiences and outreach activities for high school and elementary school students in the neighbourhood community of USC with a high concentration of under-represented population in STEM fields.

摘要：分子纳米磁铁是一种能产生大磁场的纳米级磁铁。由于其磁性的量子性质和调节其磁性的能力，分子纳米磁体是未来应用于纳米级磁存储和量子信息处理器件的有前途的材料。该项目需要一项研究计划，将分子纳米磁铁中的量子记忆时间（称为量子退相干时间）的调查和控制与南加州大学（USC）的创新跨学科教育和推广活动结合起来。研究活动的重点是利用独特的磁共振技术揭示分子纳米磁体中量子退相干的起源，从而显著提高量子相干性。此外，该项目还包括教育活动，包括南加州大学研究生和本科生的研究培训和课程开发，以及南加州大学附近社区高中生和小学生的科学体验和外展活动，该社区在STEM领域的代表性不足人口高度集中。技术摘要：本项目旨在研究和控制分子纳米磁体中的量子相干性。量子退相干已成为许多固体自旋系统中最紧迫的问题之一。在固态系统中，分子纳米磁体由于其纳米级尺寸、磁性的量子性质、物理和化学稳定性以及调节磁性和与周围环境耦合的能力，是理解纳米磁性和应用于致密磁存储和量子自旋电子学器件的极好测试平台。在这个研究项目中，首席研究员计划利用新型磁共振技术来研究分子磁体中量子退相干的本质，以证明长量子相干性。这项工作的成功将为开发具有所需相干特性的分子纳米磁体提供一条有希望的途径，并为未来基于分子纳米磁体的自旋器件的科学研究奠定一个通用的平台。此外，该项目还包括教育活动，包括为南加州大学研究生和本科生提供研究培训和课程开发，以及为南加州大学邻里社区的高中生和小学生提供科学体验和外展活动，该社区在STEM领域的代表性不足人口高度集中。

项目成果

DNP-NMR of surface hydrogen on silicon microparticles

硅微粒表面氢的 DNP-NMR

• DOI: 10.1016/j.ssnmr.2019.04.008
• 发表时间: 2019
• 期刊: Solid State Nuclear Magnetic Resonance
• 影响因子: 3.2
• 作者: Shimon, Daphna;van Schooten, Kipp J.;Paul, Subhradip;Peng, Zaili;Takahashi, Susumu;Köckenberger, Walter;Ramanathan, Chandrasekhar
• 通讯作者: Ramanathan, Chandrasekhar

Reduction of surface spin-induced electron spin relaxations in nanodiamonds

• DOI: 10.1063/5.0007599
• 发表时间: 2020-08
• 期刊: arXiv: Mesoscale and Nanoscale Physics
• 作者: Zaili Peng;Jax Dallas;Susumu Takahashi

Electron spin resonance spectroscopy of small ensemble paramagnetic spins using a single nitrogen-vacancy center in diamond

• DOI: 10.1063/1.4963717
• 发表时间: 2015-07
• 期刊: Journal of Applied Physics
• 影响因子: 3.2
• 作者: C. Abeywardana;V. Stepanov;F. Cho;Susumu Takahashi

Investigation of near-surface defects of nanodiamonds by high-frequency EPR and DFT calculation

• DOI: 10.1063/1.5085351
• 发表时间: 2019-04-07
• 期刊: JOURNAL OF CHEMICAL PHYSICS
• 影响因子: 4.4
• 作者: Peng, Z.;Biktagirov, T.;Takahashi, S.
• 通讯作者: Takahashi, S.

Spin coherence in a Mn 3 single-molecule magnet

Mn 3 单分子磁体中的自旋相干性

• DOI: 10.1063/1.4940437
• 发表时间: 2016
• 期刊: Applied Physics Letters
• 影响因子: 4
• 作者: Abeywardana, Chathuranga;Mowson, Andrew M.;Christou, George;Takahashi, Susumu
• 通讯作者: Takahashi, Susumu