Intersubband absorption in modulation-doped quantum wells is usually appropriately described as a collective excitation of the confined two-dimensional electron gas. At sufficiently low electron density and low temperatures, however, the in-piane disorder potential is able to damp the collective modes by mixing the intersubband charge-density excitation with single-particle localized modes. Here we show experimental evidence of this transition. The results are analyzed within the framework of the density-functional theory and highlight the impact of the interplay between disorder and the collective response of the two-dimensional electron gas in semiconductor heterostructures.
|Titolo:||Interplay between disorder and intersubband collective excitations in the two-dimensional electron gas|
|Data di pubblicazione:||2001|
|Parole Chiave:||density functional theory, localised modes, quantum wells, two-dimensional electron gas, intersubband collective excitations, disorder|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1103/PhysRevB.64.041306|
|Appare nelle tipologie:||1.1 Articolo in rivista|