Tunneling Of Electrons Through InAs/InP Cylindrical Quantum Wires

In the framework of the effective mass and adiabatic approximation, the tunneling of electrons through InAs/InP cylindrical quantum wires have been investigated by using the transfer matrix method. The influence of the applied voltage and structure size on the transmission probability and tunneling current is discussed in details. The results indicate that the transverse energy level of the quantum wire can be used to produce an additional potential for the incident electron. In theâ… -â…¤curve, a current peak is found at an applied voltage of Va=73mV with 5mV full width at half maximum, which is in good agreement with the experimental results. In additionally, the radius and width of InAs quantum disk has very remarkable effect on the current peak. An important result is found that a largest current peak correspond to 15nm width of the quantum, which is crucial for fabricant semiconductor devices.The coherent tunneling of the coupled system can play a role in controlling the electron state. The coherent tunneling in asymmetric coupled quantum disk is studied under an electric field. The transport problem is discussed by solving a Schrodinger equation. Acorroding to numerical calculation, it is found that the radial energy level reduces with increase of the radius of quantum disk. Due to asymmetry of the structure, the electron is located in the wide quantum disk initially. With increasing the bias, the electron states are maximally delocalized. Therefore, it can be concluded that the applied voltage plays an important role in modulating the electron state.