Phys. Rev. Lett. 76, 717–721 (1996)Merons and Thomas PrecessionReceived 28 November 1994; published in the issue dated 29 January 1996 In a recent study of Thomas precession of electron spin in the context of the Dirac equation, Shankar and Mathur identify the non-Abelian Berry potential (arising from Kramers degeneracy) with the meron. We point out that there is a global mathematical subtlety which prevents such an identification. We go on to clarify the physical context in which merons do arise as Berry potentials. © 1996 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.76.717
DOI:
10.1103/PhysRevLett.76.717
PACS:
03.65.-w, 03.30.+p
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