Research on the Quantum confinement of Carriers in the Type-I Quantum Wells Structure
arxiv(2024)
Abstract
Quantum confinement is recognized to be an inherent property in
low-dimensional structures. Traditionally it is believed that the carriers
trapped within the well cannot escape due to the discrete energy levels.
However, our previous research has revealed efficient carrier escape in
low-dimensional structures, contradicting this conventional understanding. In
this study, we review the energy band structure of quantum wells considering it
as a superposition of the bulk material dispersion and quantization energy
dispersion resulting from the quantum confinement across the whole Brillouin
zone. By accounting for all wave vectors, we obtain a certain distribution of
carrier energy at each quantization energy level, giving rise to the energy
subbands. These results enable carriers to escape from the well under the
influence of an electric field. Additionally, we have compiled a comprehensive
summary of various energy band scenarios in quantum well structures, relevant
to carrier transport. Such a new interpretation holds significant value in
deepening our comprehension of low-dimensional energy bands, discovering new
physical phenomena, and designing novel devices with superior performance.
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