نتایج جستجو برای: ballistic

تعداد نتایج: 6300  

2001
Z. Y. Zeng L. D. Zhang X. H. Yan

We investigate theoretically the resonant splitting of ballistic conductance peaks in magnetic superlattices. It is found that, for magnetic superlattices with periodically arranged n identical magnetic-barriers, there exists a general (n − 1)-fold resonant peak splitting rule for ballistic conductance, which is the analogy of the (n − 1)-fold resonant splitting for transmission in n-barrier el...

Journal: :Physical review letters 2001
M Kemerink K Sauthoff P M Koenraad J W Gerritsen H van Kempen J H Wolter

We demonstrate a spectroscopic technique which is based on ballistic injection of minority carriers from the tip of a scanning-tunneling microscope into a semiconductor heterostructure. By analyzing the resulting electroluminescence spectrum as a function of tip-sample bias, both the injection barrier height and the carrier scattering rate in the semiconductor can be determined. This technique ...

1998
Richard Quint van der Linde

Previous research has shown that passive (or ballistic) walking is an energetic efficient and mechanical cheap way of walking. Therefore ballistic walking would be suitable for apphcauons in rehabilitation technology and autonomous robots. Successful application would require a smooth hip trajectory in ordet to protect respectively the patient or electronics against large velocity changes due t...

Journal: :Nano letters 2007
Denis A Areshkin Daniel Gunlycke Carter T White

Stimulated by recent advances in isolating graphene and similarities to single-wall carbon nanotubes, simulations were performed to assess the effects of static disorder on the conductance of metallic armchair- and zigzag-edge graphene nanostrips. Both strip types were found to have outstanding ballistic transport properties in the presence of a substrate-induced disorder. However, only the zig...

2006
A. Romanelli

We study the resonances of the quantum kicked rotor subjected to an excitation that follows an aperiodic Fibonacci prescription. In such a case the secondary resonances show a sub-ballistic behaviour like the quantum walk with the same aperiodic prescription for the coin. The principal resonances maintain the well-known ballistic behaviour. Then the parallelism previusly established between the...

2013
M. Daoudi L. Varani

In this paper, we analyze the problem of quasiballistic electron transport in ultra small of mercury -cadmiumtelluride (Hg0.8Cd0.2Te -MCT) n-nn devices from hydrodynamic point view. From our study, we note that, when the size of the active layer is low than 0.1μm and for low bias application ( ) mV 9 ≥ , the quasi-ballistic transport has an important effect. Keywords—Hg0.8Cd0.2Te semiconductor,...

2008
T. Kühn

At low temperatures, phonon scattering can become so weak that phonon transport becomes ballistic. We calculate the ballistic phonon conductance G for membranes using elasticity theory, considering the transition from three to two dimensions. We discuss the temperature and thickness dependence and especially concentrate on the issue of material parameters. For all membrane thicknesses, the best...

2017
Marko Ljubotina Marko Žnidarič Tomaž Prosen

Generalized hydrodynamics predicts universal ballistic transport in integrable lattice systems when prepared in generic inhomogeneous initial states. However, the ballistic contribution to transport can vanish in systems with additional discrete symmetries. Here we perform large scale numerical simulations of spin dynamics in the anisotropic Heisenberg XXZ spin 1/2 chain starting from an inhomo...

2013
Ramesh Venugopal Zhibin Ren Mark S. Lundstrom

We present a modeling scheme for simulating ballistic hole transport in thin-body fully depleted silicon-on-insulator pMOSFETs. The scheme includes all of the quantum effects associated with hole confinement and also accounts for valence band nonparabolicity approximately. This simulator is used to examine the effects of hole quantization on device performance by simulating a thin (1.5-nm) and ...

Journal: :Nano letters 2013
Steven Chuang Qun Gao Rehan Kapadia Alexandra C Ford Jing Guo Ali Javey

Ballistic transport of electrons at room temperature in top-gated InAs nanowire (NW) transistors is experimentally observed and theoretically examined. From length dependent studies, the low-field mean free path is directly extracted as ~150 nm. The mean free path is found to be independent of temperature due to the dominant role of surface roughness scattering. The mean free path was also theo...

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