Combining theory and computation,we explore the Goos–H¨anchen(GH)effect for electrons in a single-layered semiconductor microstructure(SLSM)modulated by Dresselhaus spin–orbit coupling(SOC).GH displacement depe...Combining theory and computation,we explore the Goos–H¨anchen(GH)effect for electrons in a single-layered semiconductor microstructure(SLSM)modulated by Dresselhaus spin–orbit coupling(SOC).GH displacement depends on electron spins thanks to Dresselhaus SOC,therefore electron spins can be separated from the space domain and spinpolarized electrons in semiconductors can be realized.Both the magnitude and sign of the spin polarization ratio change with the electron energy,in-plane wave vector,strain engineering and semiconductor layer thickness.The spin polarization ratio approaches a maximum at resonance;however,no electron-spin polarization occurs in the SLSM for a zero in-plane wave vector.More importantly,the spin polarization ratio can be manipulated by strain engineering or semiconductor layer thickness,giving rise to a controllable spatial electron-spin splitter in the field of semiconductor spintronics.展开更多
小型单相直线斯特林电机(SLSM)在军事、航天等领域应用广泛,但大功率大冷量的斯特林电机控制器研究还在起步阶段。本文针对一台最大功率1 k W、最低制冷温度-150℃的单相直线斯特林电机设计了其驱动控制系统,介绍了系统的组成结构与设...小型单相直线斯特林电机(SLSM)在军事、航天等领域应用广泛,但大功率大冷量的斯特林电机控制器研究还在起步阶段。本文针对一台最大功率1 k W、最低制冷温度-150℃的单相直线斯特林电机设计了其驱动控制系统,介绍了系统的组成结构与设计思路,分析比较了基于PID的几种改进温度控制方法,并搭建了试验平台。试验结果表明此种方案可有效提高系统功率因数,并实现温度的精确控制。展开更多
基金Project supported by the National Natural Science Foundation of China(Grant No.62164005).
文摘Combining theory and computation,we explore the Goos–H¨anchen(GH)effect for electrons in a single-layered semiconductor microstructure(SLSM)modulated by Dresselhaus spin–orbit coupling(SOC).GH displacement depends on electron spins thanks to Dresselhaus SOC,therefore electron spins can be separated from the space domain and spinpolarized electrons in semiconductors can be realized.Both the magnitude and sign of the spin polarization ratio change with the electron energy,in-plane wave vector,strain engineering and semiconductor layer thickness.The spin polarization ratio approaches a maximum at resonance;however,no electron-spin polarization occurs in the SLSM for a zero in-plane wave vector.More importantly,the spin polarization ratio can be manipulated by strain engineering or semiconductor layer thickness,giving rise to a controllable spatial electron-spin splitter in the field of semiconductor spintronics.
文摘小型单相直线斯特林电机(SLSM)在军事、航天等领域应用广泛,但大功率大冷量的斯特林电机控制器研究还在起步阶段。本文针对一台最大功率1 k W、最低制冷温度-150℃的单相直线斯特林电机设计了其驱动控制系统,介绍了系统的组成结构与设计思路,分析比较了基于PID的几种改进温度控制方法,并搭建了试验平台。试验结果表明此种方案可有效提高系统功率因数,并实现温度的精确控制。
