Department of Physics

Selector de Idiomas

Ángela Stella Camacho Beltrán

Office: BD. Ip-212
Telephone: (571) 339-4949, Ext. 2737
Web Page: Personal - CvLAC
E-Mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
Office Hours: By appointment.

"Presently my interest is focused on the interaction of light with nano-scale systems of zero and one dimensions; the zero-dimension (0D) consists of metallic or semiconducting nanoparticles also known as quantum dots. In both cases, they can be coupled in more complex systems such as artificial molecules and wires or mostrand chains or dimension one properties: Nano-wires that serve as a model of carbon nanotubes.

1) Coupling between semiconductor quantum dots is analyzed by studying photo-luminance that allows to optically control the process of coupling to form more complex molecules. That is, we studied the effects of an electric and a magnetic field on energy levels of quantum dots with different load configurations: electrons, excitons and trions during the coupling process. To examine the nonlinearity in the interaction light - matter of isolated asymmetric quantum dots and in the process of formation of asymmetric artificial molecules is another of our objectives.

2) Describing the collective surface excitations in quasi-one-dimensional systems produced by interaction with light in carbon nanotubes. Carbon nanotubes are ideal candidates for designing electro-mechanical devices in which electronic and mechanical properties of nano-objects are coupled. These are proposed as ultra-sensitive mass and strength sensors and simultaneously as platforms to explore fundamental questions in quantum mechanics.

Carbon nanotubes (CNT's) have excellent electrical and mechanical properties as well as being tunable in a very wide frequency range; their mechanical properties are easily increased by using electric fields. When the applied electric field is oscillating, the nanotubes execute vibrations. These electromechanic vibrations can be increased by resonance with a specific field frequency that can enter into resonance with the field frequencies to achieve electromechanical nano-resonators. "

Títulos Académicos:
  • Der.rer.nat. (U. of Mainz, 1977)
  • M.S. (Superior Technical School, Darmstadt, 1973)
  • Physics (u. Nacional, 1970)
Research Area:
  • Condensed Matter Physics
Other research interests:
  • Low-dimensional Physics
Current research:
  • Theory of magnetism on diluted magnetic solid materials.
  • Development ofTight-Binding Calculations for Semiconductor Band Structures and Transition Metals in Low-dimensional Systems: Surfaces, Quantum wells, Supernetting.
  • Magnetic Properties of Super-netting on Diluted Magnetic Semiconductors.
  • Resonant tunneling in quantum wells II-VI and ternary and Valence band structure in ZnSe-based Quantum Wells using the Keldysh method. Expansion Method 1 / N. Calculation of exciton binding energies. Calculations of optical absorption in quantum wells by the fractional dimensionality empirical method and by the analytical method of exciton Green function. Electronic band structures of ternary surfaces and mixture of bands on the top of the valence band in quantum wells.
  • Linear optical absorption in low dimensional systems: Quantum wells. Calculations of optical absorption in semi-magnetic semiconductor systems. The magnetic Polaron. Calculations of optical absorption in wells and quantum dots II-VI taking into account the effect on the exciton of the LO phonon. Electric field effect on the exciton recombination in low dimensional systems.
  • Phonon dispersionrates in quantum wells. Population Kinetics and Quantum State Control in Mesoscopic Systems.
  • Ultrafast processes and coherent electromagnetic wave emitters.
  • Emitters and detectors in the THz region. Semi-classical model of decoherence.
  • Neighboring Nanostruture Dynamic coupling. Anderson localization and disorder effects in Quantum Dots. The Polaron problem in Quantum Dots.
  • Electronic and Optical Properties of Nanostructured Materials. Superficial plasmon spread in uni-dimensional nano systems.
Service to the Department:
  • Member of the Graduate Department Committee
  • Member of the Professorial Ranking (or appointing) Committee of the School of Science