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Larmor precession and dwell time of a particle scattered by a quantum well |
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| Authors: | Zhi-Jian Li Jiu-Qing Liang Qi-Wei Yan |
| Institution: | a Department of Physics and Institute of Theoretical Physics, Shanxi University, Taiyuan, Shanxi 030006, China;b State Key Laboratory of Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China |
| Abstract: | The Larmor precession of a neutral spin- particle in a uniform constant magnetic field confined to the region of a one-dimensional rectangular potential well is investigated. The spin precession serves as a clock to measure the time spent by a quantum particle dwelling at a potential well. With the help of a general spin coherent state it is explicitly shown that the spin precession time is equal to the dwell time. The comparison of the time in a potential well with that in free space shows apparent superluminality. |
| Keywords: | Dwell time Larmor precession Apparent superluminality |
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