First, the theoretical equation for the transmission coefficient is derived and the resonance conditions are studied. It is found that resonance is not related to the existence of the outer wells and is governed
1.By using the coherent quantum transport theory and transfer matrix method,thetransmission coefficientand tunnel magnetic resistance for polarized electrons with different spin orientations through ferromagnetic/semiconductor/ferromagnetic tunnel junctions are investigated.采用相干量子输运理论和传递矩阵方法研究了具...
In the light of the above statement, we thus start by con- sidering the most general Hamiltonian as equation (2) describing a Weyl point. In order to solve the transport problem in the Weyl semimetal superlattice (sketched in Fig. 1), we assume Ψtehi(garet)nts=htaeψtei(nszc)...
In the tunneling limit, the voltage dependence of T can be deduced by using the free-electron density of states and the Wentzel–Kramers–Brillouin (WKB) transmission coefficient28 and by considering a total potential including the potential barrier U(z) and the biasing energy Ubias(z, V) ...
Equation (5) has been derived heuristically from Eq. (4) but can be shown rigorously (Tsu and Esaki, 1973). To evaluate Eq. (5) we must find the transmission coefficient T. It will be shown in Section II.B that, in the neighborhood of a resonance, T is given by a Breit-Wigner ...
If an electron exhibits sufficient energy that corresponds to the resonant level of the quantum well, the attained transmission coefficient will be near to unity. This means that an electron having resonant energy is capable of crossing the barrier, that is, tunneling instead of being reflected. ...
Analytical expressions of transmission coefficient and tunneling time of electrons incident on a heterostructure grown on an anisotropic material are derived by solving the effective-mass equation including off-diagonal effective-mass tensor elements. It is assumed that the direction of propagation of the...
tunnel through the barrier. The tunneling current is defined as the ratio of the current density emerging from the barrier divided by the current density incident on the barrier. If this transmission coefficient across the barrier is a non-zero value, then there exists a finite possibility that ...
Let z = 0, take σv = P0, the solution to the preceding equation is (7-4)σv=B(γ−c/B)/Ktanφ[1−e−Ktanφ(z/B)]+P0e−Ktanφ(z/B) In the formula: K—Empirical earth pressure coefficient, take 1.0; P0—Overlying soil weight. Applying this theory to shield machine...
场发射特性也称为Fowler-Nordheim隧道效应，低维材料中的电子在外加电场作用下穿过势垒的过程。在金属半导体异质结和重参杂半导体中，这种量子隧穿效应起着重要的作用。We derive of the tunnel probability from the time independent Schrödinger equation:[3.1.44]which can be rewritten as [3.1.45]Assuming ...