Transport in GaAs/Al{sub x}Ga{sub 1-x}As superlattices with narrow forbidden minibands: Low-frequency negative differential conductivity and current oscillations
- Russian Academy of Sciences, Institute for Physics of Microstructures (Russian Federation)
Current-voltage characteristics have been measured and low-frequency current instabilities have been studied for GaAs/Al{sub x}Ga{sub 1-x}As superlattices with narrow forbidden minibands. At relatively low electric fields, a saw-like structure for current-voltage characteristics with alternating portions of positive and negative differential conductivity and spontaneous generation of low-frequency current oscillations with a complex frequency spectrum (varying from discrete to continuous) are observed. It is shown that the observed specific features of electron transport are caused by the spatial-temporal dynamics of electric-field domains (dipoles and monopoles). The effects of the bifurcation, hysteresis, and multistability of current-voltage characteristics are also observed. At high fields, regular features are observed and identified in the current-voltage characteristics; these features are caused by resonance tunneling of electrons between the levels of the Wannier-Stark ladders belonging to quantum wells separated by several periods.
- OSTI ID:
- 21260418
- Journal Information:
- Semiconductors, Journal Name: Semiconductors Journal Issue: 2 Vol. 43; ISSN SMICES; ISSN 1063-7826
- Country of Publication:
- United States
- Language:
- English
Similar Records
Transport in GaAs/Al{sub x}Ga{sub 1-x}As superlattices with narrow minibands: Effects of interminiband tunneling
Wannier-Stark states in a superlattice of InAs/GaAs quantum dots
Inverse Bloch-oscillator: Strong Thz-photocurrent resonances at the Bloch frequency
Journal Article
·
Sat Feb 14 23:00:00 EST 2009
· Semiconductors
·
OSTI ID:21260419
Wannier-Stark states in a superlattice of InAs/GaAs quantum dots
Journal Article
·
Tue Jun 15 00:00:00 EDT 2010
· Semiconductors
·
OSTI ID:21562279
Inverse Bloch-oscillator: Strong Thz-photocurrent resonances at the Bloch frequency
Conference
·
Sat Dec 30 23:00:00 EST 1995
·
OSTI ID:238901