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学术报告


7月3日邱奎霖报告

发布时间:2017-07-03

报告时间:7月3日 周一 下午3:00

报告地实验室一楼会议室

报告人:邱奎霖博士(Kuei-Lin Chiu,Department of Physics, MIT)

报告题目: Single particle probing in 2D materials

报告摘要:

    Manipulating single particle states in semiconducting nanostructures has the potential for realizing solid state qubits. Owing to its weak spin-orbit and hyperfine interactions, spin qubits hosted by graphene quantum dots are expected to have a long decoherence time. In order to understand the function of graphene quantum dots, we have studied a series of graphene nanostructures using different techniques, including scanning gate microscopy, charge pumping and capacitance spectroscopy. The early studies have shown the absence of spin related physics, such as spin blockade, which is essential for the spin relaxation time measurement. It has been attributed to several mechanisms that induce fast spin relaxation, one of which is the resonant scattering of electrons off spin-active edges. In order to circumvene this hurdle, we have developed vertical and gate defined quantum dots in 2D materials and studied their single electron tunneling spectroscopy. Our studies provide a new platform to integrate with radio-frequency techniques and have the prospect of measuring spin lifetimes in graphene as this is a decade-old problem. 

报告人研究领域: 

2D materials, single-electron transport, capacitance spectroscopy 

主要参考文献: 

Nat. Phys., 3, 192 (2007) 

Phys. Rev. B. 83, 115441, (2011) 

Phys. Rev. B. 85, 205452, (2012) 

Nature Nanotechnology 8, 417–420 (2013)

Physics Reports 669, 1-42, 2017