| Larmor Precession and Tunnelling Time of a Non—Relativistic Neutral Spin—1／2 Particle Through an Arbitrary Potential Barrier |
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| 引用本文： | 李志坚,严启伟,等.Larmor Precession and Tunnelling Time of a Non—Relativistic Neutral Spin—1／2 Particle Through an Arbitrary Potential Barrier[J].中国物理快报,2002,19(1):10-13. |
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| 作者姓名： | 李志坚 严启伟 |
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| 作者单位： | [1]InstituteofTheoreticalPhysics,ShanxiUniversity,Taiyuan030006 [2]StateKeyLaboratoryofMagnetism,InstituteofPhysics,ChineseAcademyofSciences,P.O.Box603,Beijing100080 |
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| 摘 要： | We investigate the Larmor precession of a non-relativistic neutral spin-1/2 particle in a uniform constant magnetic field confined to the region of a one-dimensional arbitrary potential barrier.With the help of a general spin coherent state it is explicitly shown that the spin precession time is equal to the dwell time.For the special case of a symmetric rectangular potential barrier,the precession time is also in agreement with the transmission time.We present a numerical estimation of the precession time showing an apparent superluminal tunnelling.
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| 关 键 词： | 拉莫进动 隧道时间 中性自旋1／2粒子 通过势垒 |
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