Results 271 to 280 of about 104,391 (313)

Conformation, and Charge Tunneling through Molecules in SAMs.

Journal of the American Chemical Society, 2021
This paper demonstrates that the molecular conformation (in addition to the composition and structure) of molecules making up self-assembled monolayers (SAMs) influences the rates of charge tunneling (CT) through them, in molecular junctions of the form ...
Lee Belding, Samuel E. Root, Yuan Li, Junwoo Park, M. Baghbanzadeh, Edwin M Rojas, Priscilla F. Pieters, H. Yoon, G. Whitesides   +8 more
semanticscholar   +1 more source

Temperature-dependent width of current tristability for resonant tunnelling through a double-barrier structure

Journal of Physics: Condensed Matter, 1995
When electrons tunnel through a double-barrier structure, there exists a region of bistability (or tristability) in the current-voltage characteristics due to the dynamical charge feedback effect in the resonant well. We propose a mechanism of acoustic-phonon-assisted tunnelling to explain the experimentally observed non-monotonic behaviour of the ...
D J Fisher, Chao Zhang
openaire   +1 more source

Plane two-barrier resonance-tunneling structures: Resonance energies and resonance widths of quasi-stationary electron states

Semiconductors, 2009
A theory of resonance energies and widths of quasi-stationary states is suggested; this theory is based on the distribution function of the probability density for the location of an electron in a two-barrier resonance-tunneling structure, and on the use of a transfer matrix and an S scattering matrix in the models of rectangular and δ-shaped ...
N. V. Tkach, Yu. A. Seti
openaire   +1 more source

Comparison of tunnelling rates in two Langmuir-Blodgett quantum well structures differing only in barrier width

Thin Solid Films, 1994
Abstract Langmuir-Blodgett multilayer structures were fabricated from two homologous, amphiphilic phthalocyanine molecules and differed only in interlayer separation. Sandwiching such multilayers between electrodes and using a pulsed photoconduction technique it proved possible to excite mobile carriers and to observe their motion directly as an ...
K.J. Donovan, J. Elliot, K. Scott, R.V. Sudiwala, E.G. Wilson, T.R. Clark, D.A. Batzel, M.E. Kenney   +7 more
openaire   +1 more source

Giant peak to valley ratio in a GaN based resonant tunnel diode with barrier width modulation

Superlattices and Microstructures, 2016
Abstract A barrier width modulated GaN based resonant tunnel diode is theoretically proposed which exhibits a giant peak to valley current ratio as high as 60 and a high negative differential conductance (NDC) of 1.77 × 106 S/cm2 with very low valley current density of 3 mA/cm2.
Sandeep Sankaranarayanan, Dipankar Saha
openaire   +2 more sources

Pulse-Width Dependence in Current-Driven Magnetization Reversal Using GaMnAs-Based Double-Barrier Magnetic Tunnel Junction

Journal of Superconductivity and Novel Magnetism, 2007
We have investigated the current pulse width dependence on current-driven magnetization reversal in double-barrier structures using GaMnAs-based magnetic tunneling junctions (MTJ) in order to clarify the origin of low threshold current density for current-driven magnetization reversal.
Jun Okabayashi, M. Watanabe, H. Toyao, T. Yamaguchi, Junji YOSHINO   +4 more
openaire   +1 more source

Direct observation of Klein tunneling in phononic crystals

Science, 2020
A sound demonstration of Klein tunneling The ability of particles to tunnel through barriers is an important property of quantum mechanical systems, and the extent of the effect is strongly dependent on the properties of the barrier.
Xue‐Pei Jiang, Chengzhi Shi, Zhenglu Li, Siqi Wang, Yuang Wang, Sui Yang, S. Louie, Xiang Zhang   +7 more
semanticscholar   +1 more source

STM/STS study of single crystalline Bi2Sr2CaCu2Oy (1) : Superconducting gap and barrier width dependence of tunneling spectrum

Physica C: Superconductivity, 1991
Abstract Atomic resolution STM/STS has been performed on the cleaved surface (BiO layer) of Bi 2 Sr 2 CaCu 2 O y at cryogenic temperatures down to 4.2K. The STM image taken at 4.2K clearly demonstrated atomic corrugations of Bi atoms, securing the vacuum tunneling in the present experiment.
Masashi Nantoh, Seiji Heike, Hiroshi Ikuta, Tetsuya Hasegawa, Koichi Kitazawa   +4 more
openaire   +1 more source

Barrier Widths and Tunneling in the Four‐Centered Syn Elimination of H‐X from Ethyl‐X. The Role of Transition State Asymmetry

Israel Journal of Chemistry, 1993
AbstractThe syn elimination of HX from CH3CH2X produces a C2H4‐HX complex, which is stabilized relative to ethylene and HX. The primary kinetic H/D isotope effects in the complex‐forming steps of such reactions have been examined ab initio for X = H, BH2, CH2, NH2, NH3+, OH, OH2+, F, Cl, and Br, using 3–21G, 3–21G(d), 6–31G(d), and MP2/6–31G(d ...
Saul Wolfe, Chan‐Kyung Kim
openaire   +1 more source

Effect of the width of the spacer layers on the size of the bistability region in the current-voltage characteristics of two-barrier tunnel resonance diodes

Technical Physics Letters, 1997
This paper discusses the question of how the size of the spacer layers affects the position and width of the bistability region in the current-voltage characteristics of tunnel resonance diodes. The current-voltage characteristics were calculated in terms of the self-consistent effective-mass approximation.
M. M. Vrubel’, V. M. Borzdov, F. F. Komarov   +2 more
openaire   +1 more source