Taking Hermitian functions as envelope functions, this paper presents a calculation of the transmission coefficient for electrons tunneling through multibarrier heterostructures with parabolic quantum wells under cros...Taking Hermitian functions as envelope functions, this paper presents a calculation of the transmission coefficient for electrons tunneling through multibarrier heterostructures with parabolic quantum wells under crossed electric and magnetic fields by using the transfer matrix method. Electric field effect, magnetic field effect, well width and barrier height effects on resonant tunneling are studied in detail. It is found that all of these four factors affect the peak value and peak position of the transmission coefficient. For symmetric double barrier systems, the wider the well is and the lower the barrier is, the more drastically are peaks reduced by the magnetic field. But for triple barrier systems, with increasing magnetic field strength, the variation of peak value exhibits complicated behavior due to the coupling of the quasibound states in two quantum wells of the system.展开更多
文摘Taking Hermitian functions as envelope functions, this paper presents a calculation of the transmission coefficient for electrons tunneling through multibarrier heterostructures with parabolic quantum wells under crossed electric and magnetic fields by using the transfer matrix method. Electric field effect, magnetic field effect, well width and barrier height effects on resonant tunneling are studied in detail. It is found that all of these four factors affect the peak value and peak position of the transmission coefficient. For symmetric double barrier systems, the wider the well is and the lower the barrier is, the more drastically are peaks reduced by the magnetic field. But for triple barrier systems, with increasing magnetic field strength, the variation of peak value exhibits complicated behavior due to the coupling of the quasibound states in two quantum wells of the system.
