Effect of negative electric field on spin-dependent tunneling in double barrier semiconductor heterostructures

2015 ◽  
Vol 15 (11) ◽  
pp. 1421-1427 ◽  
Author(s):  
L.Bruno Chandrasekar ◽  
K. Gnanasekar ◽  
M. Karunakaran ◽  
R. Chandramohan
Keyword(s):  
Electric Field ◽  
Semiconductor Heterostructures ◽  
Double Barrier ◽  
Negative Electric Field

The Lobe Structure in Ice Accreted on an Aluminium Conductor in The Presence of a Dc Electric Field

1983 ◽  
Vol 4 ◽  
pp. 228-235 ◽  
Author(s):  
Luan C. Phan ◽  
Jean-Louis Laforte ◽  
Du D. Nguyen
Keyword(s):  
Electric Field ◽  
Local Heat Transfer ◽  
Local Heat ◽  
Air Bubbles ◽  
Experimental Conditions ◽  
Charged Droplets ◽  
Water Drops ◽  
The Difference ◽  
Negative Electric Field ◽  
Corona Wind

Supercooled droplets of 38 μm mean volume diameter are accreted on a smooth aluni mum cylinder of 3.15 cm in diameter in order to study the effect of an electrostatic field upon ice formation on a power-line conductor. The results obtained show that ice grown in the presence of an applied negative field of 15 kV cm−1 exhibits a cusped-lobe structure characterized by surfacial outward knobs, convex rings of fine air bubbles and radial lines of large air bubbles; in the same conditions, a positive electric field of 15 kV cm−1 does not produce such lobe features. On the other hand, accretion tests performed in the absence of an electric field with a 33 μm droplet spectrum show that the well-developed cusped-lobe structure appears in ice at low ambient temperature and air velocity. In the present experimental conditions, the formation of cusped lobes observed in the presence of a negative electric field could be explained by a decrease in the temperature of the deposit due to a reduction of impact velocity of the charged droplets and/or an increase in the local heat-transfer coefficient at the surface of the ice accretion. Corona wind from ice points, always in the opposite direction to the impinging droplets, may also reduce their impact velocities. In addition, corona wind and roughness of the surface may contribute to a better evacuation of the latent heat and thus decrease the deposit temperature. The difference between the effects of a negative DC field and those of a DC positive field of the same strength comes from a stronger ionization intensity and/or a stronger deformation of water drops in the negative electric field.

Effect of Barrier Width on Spin-Dependent Tunneling in Asymmetrical Double Barrier Semiconductor Heterostructures

2016 ◽  
Vol 6 (3) ◽  
pp. 175-179 ◽  
Author(s):  
L. Bruno Chandrasekar ◽  
K. Gnanasekar ◽  
M. Karunakaran ◽  
R. Chandramohan
Keyword(s):  
Semiconductor Heterostructures ◽  
Barrier Width ◽  
Double Barrier

The absence of ferroelectric polarization in layered and rock-salt ordered NaLnMnWO6 (Ln = La, Nd, Tb) perovskites

2014 ◽  
Vol 16 (11) ◽  
pp. 5407-5411 ◽  
Author(s):  
Chandan De ◽  
Tai Hoon Kim ◽  
Kee Hoon Kim ◽  
A. Sundaresan
Keyword(s):  
Electric Field ◽  
Time Dependence ◽  
Rock Salt ◽  
Ferroelectric Polarization ◽  
Negative Electric Field

Time dependence of current in response to the first and second negative electric field pulses indicating the absence of ferroelectricity in NaNdMnWO6.

Spin-dependent tunneling in double-barrier semiconductor heterostructures

1999 ◽  
Vol 59 (19) ◽  
pp. 12514-12520 ◽  
Author(s):  
A. Voskoboynikov ◽  
Shiue Shin Liu ◽  
C. P. Lee
Keyword(s):  
Semiconductor Heterostructures ◽  
Double Barrier
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