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Stark Effect for Donors in Rolled-Up Quantum Well.
Luis Francisco Garcia Russi1, Ilia D Mikhailov1, Ruthber Antonio Escorcia Caballero2
1Escuela de Física, Facultad de Ciencias, Universidad Industrial de Santander, A. A. 678, Bucaramanga 680002, Colombia.
Micromachines
|July 29, 2023
Summary
We calculated shallow donor energies in a rolled-up quantum well. Donor position, spiral geometry, and electric fields significantly impact the density of states and donor properties.
Area of Science:
- Condensed Matter Physics
- Quantum Mechanics
- Nanotechnology
Background:
- Rolled-up semiconductor nanomembranes offer unique quantum confinement.
- Shallow donors in quantum wells are crucial for electronic and optical properties.
- Understanding donor behavior under electric fields is key for device applications.
Purpose of the Study:
- To investigate the electronic properties of shallow donors in a rolled-up quantum well.
- To analyze the influence of electric fields and structural parameters on donor states.
- To explore the dipole moment and polarizability of donors in this novel geometry.
Main Methods:
- Numerical solution of the Schrödinger equation.
- Utilizing natural curvilinear coordinates for the rolled-up geometry.
- Analysis of density of states, dipole moment, and polarizability.
Main Results:
- Density of states curves show high sensitivity to donor position, spiral geometry, and electric field.
- Novel dependencies of donor dipole moment and polarizability on electric field strength and orientation were found.
- Anisotropic Stark effect leads to spike-like polarizability and sharp dipole moment variations.
Conclusions:
- The electronic properties of shallow donors are highly tunable in rolled-up quantum wells.
- The observed anisotropic Stark effect offers new possibilities for electric field control.
- This research provides insights for designing novel nanodevices based on tailored quantum structures.
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