Electron focusing in metals and semimetals

J. Heil, A. Böhm, A. Gröger, M. Primke, P. Wyder, P. Keppler, J. Major, H. Bender, E. Schönherr, H. Wendel, B. Wolf, K. U. Würz, W. Grill, H. Herrnberger, S. Knauth, J. Lenzner

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Partly ballistic propagation of carriers and phonons in single crystals of the metals Ag and W and the semimetal Bi is studied in real space. The carriers are excited by heating a small surface area of the sample by illumination or electron beam irradiation. Alternatively they are injected through point contacts. They spread out from this point-like source setting up a characteristic anisotropic current pattern representing some kind of fingerprint of the material's band structure. If the sample thickness is comparable to the mean free path of the carriers, they produce a potential pattern on the opposite sample surface. We present images of these patterns revealing the phenomenon of electron focusing, i.e. caustics produced by a diverging density of trajectories in specific directions. The influence of magnetic fields is studied. We give some basic theoretical analysis of the data in terms of fully ballistic transport. An outlook into possible future developments and applications of the technique and the completion of the theoretical model is given.

Original languageEnglish
Pages (from-to)387-455
Number of pages69
JournalPhysics Reports
Volume323
Issue number5
Publication statusPublished - Jan 2000

Fingerprint

metalloids
ballistics
metals
electrons
mean free path
point sources
alkalies
phonons
illumination
trajectories
electron beams
irradiation
heating
propagation
single crystals
magnetic fields

Keywords

  • Ballistic transport
  • Electron focusing
  • Electronic transport
  • Thermopower

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Heil, J., Böhm, A., Gröger, A., Primke, M., Wyder, P., Keppler, P., ... Lenzner, J. (2000). Electron focusing in metals and semimetals. Physics Reports, 323(5), 387-455.

Electron focusing in metals and semimetals. / Heil, J.; Böhm, A.; Gröger, A.; Primke, M.; Wyder, P.; Keppler, P.; Major, J.; Bender, H.; Schönherr, E.; Wendel, H.; Wolf, B.; Würz, K. U.; Grill, W.; Herrnberger, H.; Knauth, S.; Lenzner, J.

In: Physics Reports, Vol. 323, No. 5, 01.2000, p. 387-455.

Research output: Contribution to journalArticle

Heil, J, Böhm, A, Gröger, A, Primke, M, Wyder, P, Keppler, P, Major, J, Bender, H, Schönherr, E, Wendel, H, Wolf, B, Würz, KU, Grill, W, Herrnberger, H, Knauth, S & Lenzner, J 2000, 'Electron focusing in metals and semimetals', Physics Reports, vol. 323, no. 5, pp. 387-455.
Heil J, Böhm A, Gröger A, Primke M, Wyder P, Keppler P et al. Electron focusing in metals and semimetals. Physics Reports. 2000 Jan;323(5):387-455.
Heil, J. ; Böhm, A. ; Gröger, A. ; Primke, M. ; Wyder, P. ; Keppler, P. ; Major, J. ; Bender, H. ; Schönherr, E. ; Wendel, H. ; Wolf, B. ; Würz, K. U. ; Grill, W. ; Herrnberger, H. ; Knauth, S. ; Lenzner, J. / Electron focusing in metals and semimetals. In: Physics Reports. 2000 ; Vol. 323, No. 5. pp. 387-455.
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