Journal Article

On Coherence Lengths of Wave Packets

Kenzo Ishikawa and Yutaka Tobita

in Progress of Theoretical Physics

Published on behalf of The Physical Society of Japan

Volume 122, issue 5, pages 1111-1136
Published in print November 2009 | ISSN: 0033-068X
Published online November 2009 | e-ISSN: 1347-4081 | DOI: http://dx.doi.org/10.1143/PTP.122.1111
On Coherence Lengths of Wave Packets

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The coherence lengths of one-particle states described using quantum wave functions are studied. We show that one particle states in various situations are not described using simple plane waves but using wave packets that are superpositions of plane waves. A wave packet is an approximate eigenstate of the free Hamiltonian and has a finite spatial size that we call the coherence length. The coherence lengths in the coordinate space and momentum space are studied in this paper. We investigate several mechanisms of forming wave packets, stabilities of wave packets, and transformations of wave packets.

Journal Article.  0 words. 

Subjects: Quantum Physics

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