Quantized Phonon Conductance of One-dimensional Systems

一维系统的量子化声子电导

• 批准号: 2231376
• 负责人: Li Shi
• 金额: $ 42.52万
• 依托单位: University of Texas at Austin
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2024
• 资助国家: 美国
• 起止时间: 2024-04-01 至 2027-03-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2231376&HistoricalAwards=false
• 关键词: Quantized; Phonon; Conductance; dimensional; Systems

Non-technical Abstract: The ability of a solid to conduct electricity and heat determines its application potential in new technologies such as microelectronics. Surprisingly, quantum physics predicts that the electricity- and heat- carrying capabilities of a solid at the nanometer scale do not reduce continuously with decreased cross-section. This quantum theory has been validated repeatedly in different experiments for both the electricity- and heat-carrying capabilities of electrons in different nanostructures. In comparison, there has been only one reported experimental observation of the predicted quantum behavior of the heat-carrying ability in a polycrystalline silicon nitride nanostructure. In response to a call for further experimental investigations of the quantum theory of lattice heat transport, this project is focused on experimental investigation of this quantum theory in individual single-walled carbon nanotubes with the use of a unique measurement method. Success of this research is expected to both enhance the understanding of a essential pillar of condensed matter physics and provide education and outreach opportunities for broadening the participation in quantum and thermal science research and technology developments. Technical Abstract: Free of two-level defects, SWCNTs are closest to an ideal one-dimensional (1D) quantum system among the nanostructures that have been experimentally realized. The goal of this work is to advance multiprobe measurements of the intrinsic thermal conductance of 1D nanostructures for accurate detection of the quantized phonon conductance that has been predicted for a SWCNT at a relatively high temperature up to about 10 K. This temperature range is much more conducive to producing unambiguous experimental evidence of quantized phonon conductance than the below-0.8 K temperature required for prior studies of silicon nitride nanobeams. If successful, the proposed measurements of SWCNTs will establish an experimental capability for detecting and controlling quantized phonon transport behaviors of low-dimensional systems. This capability is expected to advance the frontier of experimental research in a foundational area of condensed matter physics.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

非技术摘要：固体进行电力和热量的能力决定了其在微电子等新技术中的应用潜力。出乎意料的是，量子物理学预测，固体在纳米尺度下的电和热携带能力不会随着横截面的减少而不断减少。该量子理论已在不同的纳米结构中电子的电力和热携带能力的不同实验中反复验证。相比之下，只有一个报道的实验观察到了多晶硅氮化硅纳米结构中热携带能力的预测量子行为。为了响应呼吁对晶格热传输的量子理论进行进一步的实验研究，该项目的重点是使用独特的测量方法，在单个单壁碳纳米管中对该量子理论的实验研究。预计这项研究的成功既可以增强对凝结物理物理学的基本支柱的理解，并为扩大参与量子和热科学研究与技术发展的教育和外展机会。 技术摘要：没有两级缺陷，SWCNT最接近已经实现实验实现的纳米结构中理想的一维量子系统。这项工作的目的是提高1D纳米结构的内在热电导率的多生产测量值，以准确检测量化的声子电导率，这已经预测在相对较高的温度下为SWCNT预测，该温度范围比大约10 k的范围。该温度范围更大得多。纳米梁。如果成功，则提出的SWCNT测量将建立一个实验能力，用于检测和控制低维系统的量化声子传输行为。预计该能力将在凝聚态物理学的基础领域中推进实验研究的前沿。该奖项反映了NSF的法定任务，并被认为是值得通过基金会的知识分子优点和更广泛的影响评估标准通过评估来支持的。