Terahertz Electroluminescence of 6H-SiC Natural SiC Superlattice in Bloch Oscillations Regime

2012 ◽  
Vol 717-720 ◽  
pp. 553-556 ◽  
Author(s):  
Vladimir Ilich Sankin ◽  
Alexander V. Andrianov ◽  
A.G. Petrov ◽  
P.P. Shkrebiy ◽  
A.O. Zacharin
Keyword(s):  
Steady State ◽  
Field Strength ◽  
Electric Field ◽  
Emission Spectrum ◽  
Liquid Helium ◽  
Linear Dependence ◽  
Bloch Oscillations ◽  
Terahertz Emission ◽  
Natural Superlattice ◽  
Characteristic Field

We report on efficient terahertz emission in the region of 1.5-2 THz from high electric field biased 6H-SiC structures with a natural superlattice at liquid helium temperatures. The shape of the emission spectrum, the linear dependence of its maximum on the bias and the characteristic field strength required to achieve the emission allow the emission to be attributed to steady-state Bloch oscillations of electrons in the SiC natural superlattice.

The Specific Features of High-Field Transport in SiC Polytypes

2008 ◽  
Vol 600-603 ◽  
pp. 513-516 ◽  
Author(s):  
Vladimir Ilich Sankin ◽  
Pavel P. Shkrebiy ◽  
Alla A. Lepneva ◽  
M.S. Ramm
Keyword(s):  
Silicon Carbide ◽  
Electric Field ◽  
Conduction Band ◽  
High Field ◽  
Impact Ionization ◽  
Quantum Mechanical ◽  
Bloch Oscillations ◽  
Parallel Field ◽  
Natural Superlattice

A natural superlattice (NSL) in silicon carbide polytypes is shown to introduce a miniband structure into the conduction band, which leads to a number of effects in phenomena of quantum-mechanical transport and impact ionization when the electric field directed along an axis of NSL (axis C in crystal). These processes are absolutely traditional when the electric field is perpendicularly to this axis. The parallel field phenomena are explained by the effects of the Wannier–Stark localization (WSL) among them the Bloch oscillations effect is most prominent today.

NUMERICAL STUDY OF THE RESPONSE TIME OF ER SUSPENSIONS

1996 ◽  
Vol 10 (23n24) ◽  
pp. 3037-3044 ◽  
Author(s):  
JUN-ICHI TAKIMOTO ◽  
KEIJI MINAGAWA ◽  
KIYOHITO KOYAMA
Keyword(s):  
Growth Rate ◽  
Steady State ◽  
Shear Rate ◽  
Field Strength ◽  
Electric Field ◽  
Particle Density ◽  
Numerical Study ◽  
Dispersed Particles ◽  
Induced Stress ◽  
Steady Shear Flow

Transient response of model ER suspensions to step-wise electric field under steady shear flow is studied by numerical simulations. The electrically induced stress increases almost linearly with time up to the steady-state value, and this increase directly reflects the growth of the chain-like clusters of the dispersed particles. As the shear rate increases, the response becomes faster since the growth rate of the clusters increases and the steady-state length of the clusters decreases. The response also becomes faster by increasing the particle density or electric field, but the dependence on the field strength is rather weak.

High field kinetic processes in anodic oxide films on aluminium. I. Current transients for linearly changing electric field strength

1968 ◽  
Vol 46 (4) ◽  
pp. 535-548 ◽  
Author(s):  
M. J. Dlgnam ◽  
P. J. Ryan
Keyword(s):  
Steady State ◽  
Field Strength ◽  
Electric Field ◽  
Electric Field Strength ◽  
High Field ◽  
Oxide Films ◽  
Anodic Oxide ◽  
Anodic Oxide Films ◽  
Differential Field ◽  
Field Coefficient

Anodic oxide films were formed on high purity aluminium (99.996 %) under steady-state conditions (current and field strength constant) in a glycol–borate electrolyte until the film reached a predetermined thickness at which point the anodic overpotential was changed rapidly and in a linear manner. As little film growth occurred during these linear sweeps, the conditions corresponded to linearly changing field strength. From these data, the transient differential field coefficient, β1, defined by[Formula: see text]where i and E are the ion current density and electric field strength and Es the steady-state formation field strength, was determined β1 was found to vary linearly with Es in the manner [Formula: see text] with [Formula: see text] A recent theory proposed by one of us (M. J. D.) predicts that the parameter [Formula: see text] should have the same value as that deduced from the field dependence of the steady-state differential field coefficient,[Formula: see text]Such agreement was indeed found, two independently determined 'steady-state' values of [Formula: see text] being 3.53 ± 11% and 3.11 ± 14% ÅV−1. A direct comparison of the present results with previous steady-state results gave βs/β1 = μs/μ1 = 3.09. More complex features of the transients were also found to be in accord with the above theory, but could be accounted for almost as well by an earlier theory, the so-called high field Frenkel defect theory.Dielectric constant values determined from the current discontinuity appearing upon application of the linearly increasing field gave K1 = 8.35 ± .1 for transients commencing from steady-state conditions and K1 = 8.85 ± .2 for films formed then 'aged' at E = 0 before measurement. Certain anomalies with regard to the charging current were apparent.

Enhancement of Heat Transfer by an Electric Field for a Drop Translating at Intermediate Reynolds Number

2005 ◽  
Vol 127 (10) ◽  
pp. 1087-1095 ◽  
Author(s):  
Rajkumar Subramanian ◽  
M. A. Jog
Keyword(s):  
Heat Transfer ◽  
Reynolds Number ◽  
Nusselt Number ◽  
Steady State ◽  
Field Strength ◽  
Electric Field ◽  
Electric Field Strength ◽  
Continuous Phase ◽  
Dispersed Phase ◽  
Enhancement Of Heat Transfer

The enhancement of heat transfer by an electric field to a spherical droplet translating at intermediate Reynolds number is numerically investigated using a finite volume method. Two heat transfer limits are considered. The first limit is the external problem where the bulk of the resistance is assumed to be in the continuous phase. Results show that the external Nusselt number significantly increases with electric field strength at all Reynolds numbers. Also, the drag coefficient increases with electric field strength. The enhancement in heat transfer is higher with lower ratio of viscosity of the dispersed phase to the viscosity of the continuous phase. The second heat transfer limit is the internal problem where the bulk of the resistance is assumed to be in the dispersed phase. Results show that the steady state Nusselt number for a combined electrically induced and translational flow is substantially greater than that for purely translational flow. Furthermore, for a drop moving at intermediate Reynolds number, the maximum steady state Nusselt number for a combined electrically induced and translational flow is slightly greater than that for a purely electric field driven motion in a suspended drop.

Optical Measurement of the Electric Field Strength in a Gel Insulator

2016 ◽  
Vol 136 (10) ◽  
pp. 1420-1421
Author(s):  
Yusuke Tanaka ◽  
Yuji Nagaoka ◽  
Hyeon-Gu Jeon ◽  
Masaharu Fujii ◽  
Haruo Ihori
Keyword(s):  
Field Strength ◽  
Electric Field ◽  
Electric Field Strength ◽  
Optical Measurement

EFFECT OF CELLULAR MEMBRANE RESISTIVITY INHOMOGENEITY ON THE THERMAL NOISE-LIMIT

2015 ◽  
Vol 11 (3) ◽  
pp. 3171-3183
Author(s):  
Gyula Vincze
Keyword(s):  
Field Strength ◽  
Thermal Noise ◽  
Cellular Membrane ◽  
Thermal Limit ◽  
Low Frequencies ◽  
Membrane Resistivity ◽  
Noise Limit ◽  
The Asymmetry ◽  
Characteristic Field

Our objective is to generalize the Weaver-Astumian (WA) and Kaune (KA) models of thermal noise limit to the case ofcellular membrane resistivity asymmetry. The asymmetry of resistivity causes different effects in the two models. In the KAmodel, asymmetry decreases the characteristic field strength of the thermal limit over and increases it below the breakingfrequency (10  m), while asymmetry decreases the spectral field strength of the thermal noise limit at all frequencies.We show that asymmetry does not change the character of the models, showing the absence of thermal noise limit at highand low frequencies in WA and KA models, respectively.

Liquid helium-free high-T c superconducting terahertz emission system and its applications

2020 ◽  
Vol 59 (10) ◽  
pp. 105004
Author(s):  
Yoshihiko Saiwai ◽  
Takanari Kashiwagi ◽  
Kurama Nakade ◽  
Manabu Tsujimoto ◽  
Hidetoshi Minami ◽  
...  
Keyword(s):  
Liquid Helium ◽  
Terahertz Emission ◽  
Emission System
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