Spinning Quantum System in an External Magnetic Field

  • Arno Bohm
  • Ali Mostafazadeh
  • Hiroyasu Koizumi
  • Qian Niu
  • Joseph Zwanziger
Part of the Texts and Monographs in Physics book series (TMP)

Abstract

In this chapter we will discuss in detail a quantum particle with magnetic moment m = µ B g J in an external magnetic field B(t) = (math) whose direction (math) is changing periodically. In particular we will consider the case in which the direction of the magnetic field precesses around a fixed axis which we take as the 3-axis (z-axis) of our (laboratory) coordinate frame in space (ℝ3). If the direction rotates slowly (“adiabatically”) this system provides an application of the general ideas developed in Chap. 2. The Schrödinger equation for a magnetic moment in a precessing magnetic field has been solved exactly in [216]. Therefore we need not restrict ourselves to the adiabatic approximation and will obtain the non-adiabatic geometric phase. The latter is also known as the Aharonov-Anandan phase [7, 9] for their pioneering work. With the help of this example we will then introduce in Sect. 3.5 the non-adiabatic geometric phase for a general cyclic evolution.

Keywords

Lution cosB 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2003

Authors and Affiliations

  • Arno Bohm
    • 1
  • Ali Mostafazadeh
    • 2
  • Hiroyasu Koizumi
    • 3
  • Qian Niu
    • 1
  • Joseph Zwanziger
    • 4
  1. 1.Physics DepartmentUniversity of Texas at AustinAustinUSA
  2. 2.Department of MathematicsKoç UniversityIstanbulTurkey
  3. 3.Faculty of ScienceHimeji Institute of TechnologyHyogoJapan
  4. 4.Department of ChemistryIndiana UniversityBloomingtonUSA

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