scholarly journals Electrostatic potential and electric field in the z axis of a non centered circular charged ring

2021 ◽  
Vol 42 (6) ◽  
pp. 065703
Author(s):  
F Escalante
Keyword(s):  
Electric Field ◽  
Electrostatic Potential ◽  
Charged Ring

Analysis of Retention Time Degradation Caused by Electrostatic Potential Variation between Adjacent Bit-Line and Adjacent Contact Node in DRAM

2016 ◽  
Author(s):  
Jungil Mok ◽  
Byungki Kang ◽  
Daesun Kim ◽  
Hongsun Hwang ◽  
Sangjae Rhee ◽  
...  
Keyword(s):  
Electric Field ◽  
Electrostatic Potential ◽  
Critical Dimension ◽  
Data Retention ◽  
Signal Line ◽  
Adjacent Node ◽  
Storage Node ◽  
Retention Characteristics ◽  
Node Voltage ◽  
The Relationship

Abstract Systematic retention failure related on the adjacent electrostatic potential is studied with sub 20nm DRAM. Unlike traditional retention failures which are caused by gate induced drain leakage or junction leakage, this failure is influenced by the combination of adjacent signal line and adjacent contact node voltage. As the critical dimension between adjacent active and the adjacent signal line and contact node is scaled down, the effect of electric field caused by adjacent node on storage node is increased gradually. In this paper, we will show that the relationship between the combination electric field of adjacent nodes and the data retention characteristics and we will demonstrate the mechanism based on the electrical analysis and 3D TCAD simulation simultaneously.

Self-consistent Calculation of the Photocurrent in Polycrystalline Polarized Pb(ZrTi)O3 Films

2007 ◽  
Vol 1034 ◽  
Author(s):  
Lyuba A. Delimova ◽  
V. S. Yuferev ◽  
A. A. Petrov ◽  
V. P. Afanasjev ◽  
I. V. Grekhov
Keyword(s):  
Electric Field ◽  
Grain Boundaries ◽  
Electrostatic Potential ◽  
Carrier Transport ◽  
Ferroelectric Polarization ◽  
Reciprocal Effect ◽  
Consistent Calculation ◽  
Pzt Film ◽  
Pzt Films ◽  
Self Consistent

AbstractA polycrystalline Pb(ZrTi)O3 (PZT) film with Pb excess is considered as a heterophase medium that consists of PZT grains and semiconductor PbO phase. The latter is segregated on PZT grain boundaries during the PZT formation and forms conducting channels between the electrodes. In such medium, uncompensated polarization charge of PZT grains generates an electric field both inside PZT grains and PbO phase. This electric field affects on ferroelectric polarization itself and stimulates carrier transport through the PbO channels. A theory is developed, where the reciprocal effect of the electric field on the polarization is taken into account. The polarization is found due to this effect to be increased up to ∼30% near the interfaces, which differs from reduction of the polarization near the interfaces in homogeneous PZT films. Using the theory, the electric field, electrostatic potential and carriers transport in PbO channels are calculated. A comparison is made with the results calculated for the approach of the polarization constancy.

scholarly journals Conotoxins as Sensors of Local pH and Electrostatic Potential in the Outer Vestibule of the Sodium Channel

2003 ◽  
Vol 122 (1) ◽  
pp. 63-79 ◽  
Author(s):  
Kwokyin Hui ◽  
Deane McIntyre ◽  
Robert J. French
Keyword(s):  
Lipid Bilayers ◽  
Sodium Channels ◽  
Electrostatic Potential ◽  
Single Channel ◽  
Local Environment ◽  
Bound State ◽  
Channel Changes ◽  
Voltage Dependent ◽  
Charged Ring ◽  
Derivatives Of

We examined the block of voltage-dependent rat skeletal muscle sodium channels by derivatives of μ-conotoxin GIIIA (μCTX) having either histidine, glutamate, or alanine residues substituted for arginine-13. Toxin binding and dissociation were observed as current fluctuations from single, batrachotoxin-treated sodium channels in planar lipid bilayers. R13X derivatives of μCTX only partially block the single-channel current, enabling us to directly monitor properties of both μCTX-bound and -unbound states under different conditions. The fractional residual current through the bound channel changes with pH according to a single-site titration curve for toxin derivatives R13E and R13H, reflecting the effect of changing the charge on residue 13, in the bound state. Experiments with R13A provided a control reflecting the effects of titration of all residues on toxin and channel other than toxin residue 13. The apparent pKs for the titration of residual conductance are shifted 2–3 pH units positive from the nominal pK values for histidine and glutamate, respectively, and from the values for these specific residues, determined in the toxin molecule in free solution by NMR measurements. Toxin affinity also changes dramatically as a function of pH, almost entirely due to changes in the association rate constant, kon. Interpreted electrostatically, our results suggest that, even in the presence of the bound cationic toxin, the channel vestibule strongly favors cation entry with an equivalent local electrostatic potential more negative than −100 mV at the level of the “outer charged ring” formed by channel residues E403, E758, D1241, and D1532. Association rates are apparently limited at a transition state where the pK of toxin residue 13 is closer to the solution value than in the bound state. The action of these unique peptides can thus be used to sense the local environment in the ligand-–receptor complex during individual molecular transitions and defined conformational states.

Sign in / Sign up

Export Citation Format

Share Document