scholarly journals Optically induced excitonic distribution in GaInAs-AlGaInAs semiconductor superlattices under an electric field

1993 ◽  
Vol 03 (C5) ◽  
pp. C5-273-C5-276
Author(s):  
G. WANG ◽  
P. TRONC ◽  
J. DEPEYROT ◽  
J. C. HARMAND ◽  
J. F. PALMIER
Keyword(s):  
Electric Field ◽  
Semiconductor Superlattices ◽  
Optically Induced

scholarly journals Optically Induced Field-Emission Source Based on Aligned Vertical Carbon Nanotube Arrays

Nanomaterials ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1810
Author(s):  
Mengjie Li ◽  
Qilong Wang ◽  
Ji Xu ◽  
Jian Zhang ◽  
Zhiyang Qi ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Electric Field ◽  
Field Emission ◽  
Field Enhancement ◽  
Absorption Efficiency ◽  
Photon Absorption ◽  
Nanotube Arrays ◽  
Carbon Nanotube Arrays ◽  
Induced Field ◽  
Optically Induced

Due to the high field enhancement factor and photon-absorption efficiency, carbon nanotubes (CNTs) have been widely used in optically induced field-emission as a cathode. Here, we report vertical carbon nanotube arrays (VCNTAs) that performed as high-density electron sources. A combination of high applied electric field and laser illumination made it possible to modulate the emission with laser pulses. When the bias electric field and laser power density increased, the emission process is sensitive to a power law of the laser intensity, which supports the emission mechanism of optically induced field emission followed by over-the-barrier emission. Furthermore, we determine a polarization dependence that exhibits a cosine behavior, which verifies the high possibility of optically induced field emission.

scholarly journals Magnetic Control of Electric-Field Domains in Semiconductor Superlattices

1998 ◽  
Vol 81 (18) ◽  
pp. 3928-3931 ◽  
Author(s):  
T. Schmidt ◽  
A. G. M. Jansen ◽  
R. J. Haug ◽  
K. v. Klitzing ◽  
K. Eberl
Keyword(s):  
Electric Field ◽  
Magnetic Control ◽  
Semiconductor Superlattices

Dynamical localization of semiconductor superlattices under a dc-bichromatic electric field

2003 ◽  
Vol 320 (1) ◽  
pp. 63-69 ◽  
Author(s):  
Duan Suqing ◽  
Zhi-Gang Wang ◽  
Bin-Yi Wu ◽  
Xian-Geng Zhao
Keyword(s):  
Electric Field ◽  
Dynamical Localization ◽  
Semiconductor Superlattices

TRANSPORT IN EXCITED STATES OF SEMICONDUCTOR SUPERLATTICES

2000 ◽  
Vol 14 (09) ◽  
pp. 909-942
Author(s):  
A. SIBILLE ◽  
C. MINOT ◽  
F. LARUELLE
Keyword(s):  
Velocity Field ◽  
Electric Field ◽  
Excited States ◽  
Ballistic Transport ◽  
Localized States ◽  
Electronic Conduction ◽  
Hopping Conduction ◽  
Semiconductor Superlattices ◽  
Theoretical Approaches

The electronic conduction processes in the minibands and excited states of semiconductor superlattices are reviewed and discussed. The paper includes an introduction on miniband conduction and hopping conduction between localized states. It focusses subsequently on interminiband transport, both in the context of theoretical approaches and of experimental observations of these effects. Rabi oscillations between interacting Wannier–Stark levels are considered in detail. The role of scattering, and the manifestation of multipeaked velocity-field relationships on carrier and electric field profiles are evidenced. The final part concerns transport above the superlattice barriers, and quasi-ballistic transport in excited superlattice minibands.

Cathodoluminescence imaging of electric-field domains in semiconductor superlattices

1996 ◽  
Vol 40 (1-8) ◽  
pp. 527-530 ◽  
Author(s):  
S.H Kwok ◽  
U Jahn ◽  
H Kostial ◽  
J Menniger ◽  
H.T Grahn ◽  
...  
Keyword(s):  
Electric Field ◽  
Semiconductor Superlattices ◽  
Cathodoluminescence Imaging

LOCALIZATION EFFECTS IN SEMICONDUCTOR SUPERLATTICES

1996 ◽  
Vol 05 (01) ◽  
pp. 33-50
Author(s):  
S.J. LEE ◽  
J.B. KHURGIN
Keyword(s):  
Electric Field ◽  
Oscillator Strength ◽  
Optical Field ◽  
Carrier Localization ◽  
Semiconductor Superlattices ◽  
Electron Hole ◽  
Single Quantum Well ◽  
Optical Detector ◽  
Dc Electric Field ◽  
Excitonic States

We investigated two novel effects utilizing localization properties of semiconductor super-lattices. First, a phenomenon which consists of optically induced effective mass change due to carrier localization in semiconductor superlattices is investigated. It is shown that an optical field can achieve conductivity changes in a manner similar to a dc electric field. A possible application as a nonabsorbing differential optical detector/switch is considered. Second, radiative recombination of the excitonic states in semiconductor superlattices with an applied electric field is studied theoretically. It is shown that when the electron-hole Coulomb interaction energy exceeds the miniband width, a coherent excitonic state is created whose oscillator strength surpasses the oscillator strength of a single quantum well by orders of magnitude. It is also demonstrated that a small external field can split the coherent state into isolated well states and thus severely deplete the oscillator strength of the exciton. This opens the possibility of modulating and switching of superradiance in semiconductor devices.

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