Collective excitations in low-density 2D electron systems

Journal article

We report the observation of sharp plasmon and magnetoplasmon modes in ultra-low-density 2D electron systems. Well defined dispersions for the modes are observed at densities as low as 1.1×109 cm-2 and with excitation wave vectors as large as 1.2×105 cm-1. Interestingly, both modes are found to be more easily measured in low-density systems than in high-density systems. The strength of the light scattering cross-sections at low density suggests potential applications to the study of quantum phase transitions at large rs.

Authors: Eriksson, M; Pinczuk, A; Dennis, B; Hirjibehedin, C; Simon, S

• Publication status: Published
• Publisher: Elsevier
• Journal: PHYSICA E
• Volume: 6
• Issue: 1-4
• Pages: 165-168
• Publication date: 2000-02-01
• DOI: 10.1016/S1386-9477(99)00075-2
• ISSN: 1386-9477
• Language: English
• Keywords: low density; two-dimensional; metal-insulator; light scattering