Applications of Ultrafast Terahertz Pulses for Intra-ExcitonicSpectroscopy of Quasi-2D Electron-Hole Gases
Journal Article
·
· Journal of Nanoelectronics and Optoelectronics
OSTI ID:917541
Excitons are of fundamental interest and of importance foropto-electronic applications of bulk and nano-structured semiconductors.This paper discusses the utilization of ultrafast terahertz (THz) pulsesfor the study of characteristic low-energy excitations of photoexcitedquasi 2D electron-hole (e-h) gases. Optical-pump THz-probe spectroscopyat 250-kHz repetition rate is employed to detect characteristic THzsignatures of excitons and unbound e-h pairs in GaAs quantum wells.Exciton and free-carrier densities are extracted from the data using atwo-component model. We report the detailed THz response and pairdensities for different photoexcitation energies resonant to heavy-holeexcitons, light-hole excitons, or the continuum of unbound pairs. Suchexperiments can provide quantitative insights into wavelength, time, andtemperature dependence of the low-energy response and composition ofoptically excited e-h gases in low-dimensionalsemiconductors.
- Research Organization:
- Ernest Orlando Lawrence Berkeley NationalLaboratory, Berkeley, CA (US)
- Sponsoring Organization:
- USDOE Director. Office of Science. Basic EnergySciences
- DOE Contract Number:
- AC02-05CH11231
- OSTI ID:
- 917541
- Report Number(s):
- LBNL--61752; BnR: KC0202020
- Journal Information:
- Journal of Nanoelectronics and Optoelectronics, Journal Name: Journal of Nanoelectronics and Optoelectronics Journal Issue: 1 Vol. 2
- Country of Publication:
- United States
- Language:
- English
Similar Records
Transient terahertz spectroscopy of excitons and unbound carriers in quasi two-dimensional electron-hole gases
Terahertz Probes of Transient Conducting and Insulating Phases inQuasi-2D Electron-hole Gases
Ultrafast THz Spectroscopy of Correlated Electrons: From Excitonsto Cooper Pairs
Journal Article
·
Thu Sep 11 00:00:00 EDT 2008
· Physical Review B
·
OSTI ID:1169757
Terahertz Probes of Transient Conducting and Insulating Phases inQuasi-2D Electron-hole Gases
Conference
·
Thu Jul 01 00:00:00 EDT 2004
·
OSTI ID:882908
Ultrafast THz Spectroscopy of Correlated Electrons: From Excitonsto Cooper Pairs
Journal Article
·
Sat Feb 25 23:00:00 EST 2006
· physica status solidi (b)
·
OSTI ID:920160