Phys. Rev. Lett. 74, 976–979 (1995)Optical Spectroscopy of a Two-Dimensional Electron Gas near the Metal-Insulator TransitionReceived 3 June 1994; revised 21 October 1994; published in the issue dated 6 February 1995 We report on optical measurements of a two-dimensional electron gas near the metal-insulator transition. We observe the appearance of excitons and negatively charged excitons, X-, at the onset of the transition. The fact that these excitons appear at a relatively large average electron density shows that transition is induced by localization of single electrons in the electrostatic potential fluctuations of the remote ionized donors. © 1995 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.74.976
DOI:
10.1103/PhysRevLett.74.976
PACS:
71.30.+h, 71.35.+z, 73.20.Dx, 78.66.Fd
|
|
About | Terms and Conditions | Subscriptions | Search | Help
Use of the American Physical Society websites and journals implies that the user has read and agrees to our Terms and Conditions and any applicable Subscription Agreement. Physical Review®, Physical Review Letters®, Reviews of Modern Physics®, and Physical Review Special Topics® are trademarks of the American Physical Society.