Zitterbewegung of Dirac Electron in the point of view of Huang's Expectation Value

Abstract

The method of Huang's expectation value extracts for a free particle the particulate from the wave function in quantum mechanics. His method is used to investigate the Zitterbewegung of Dirac electron, which disappears in a usual expectation value. Explicit form of the Zitterbewegung as a particle motion is obtained. The uncertainty at the velocity of Dirac electron are examined closely.