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Coherent Exciton Phenomena in Quantum Dot Molecules

Rolon Soto, Juan Enrique
http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1314742055

Abstract Details

2011, Doctor of Philosophy (PhD), Ohio University, Physics and Astronomy (Arts and Sciences).
We investigate different aspects of the coherent dynamics of excitons in quantum dot molecules. A theoretical model is developed in order to extract the Forster energy transfer signatures in tunnel coupled quantum dot molecules in the presence of strong interdot tunneling. It is found that Forster coupling can induce spectral doublets in the excitonic dressed spectrum, which is suitable for detection in level anticrossing spectroscopy. The coherent exciton dynamics is investigated both in the closed and open quantum system approach by means of the Lindblad master equation. An adiabatic elimination procedure using the projection operator formalism allows us to extract effective Hamiltonians to describe analytically all relevant anticrossing gaps of the dressed spectrum. It is found that a pair of two indirect excitons can be used as the computational basis of a qubit. An adiabatic control pulse is constructed in order to manipulate the indirect exciton qubit and characterize its coherent dynamics, as well as its decoherence due to spontaneous recombination. On the other hand, recent experiments have shown that indirect excitons in hole tunnel coupled quantum dot molecules exhibit indirect exciton oscillatory relaxation rates, as function of an applied electric field. To this end we developed a model for the experimental results, in which we incorporate relaxation due to exciton-acoustic phonon coupling. We characterize the scattering structure factor and found that it contains an electrically tunable phase relationship between the phonon wave and the hole wave function, which leads to interference effects and oscillatory relaxation rates.
Sergio Ulloa, Dr (Advisor)
Alexander Govorov, Dr. (Committee Member)
Eric Stinaff, Dr. (Committee Member)
P. Gregory Van Patten, Dr. (Committee Member)
144 p.
Materials Science; Molecular Chemistry; Molecular Physics; Nanoscience; Optics; Physics; Quantum Physics; Solid State Physics; Theoretical Physics
Feshbach; Projection Operator Formalism; Adiabatic Elimination; Indirect excitons; Excitons; Quantum Dot Molecules; Qubits; Forster; Resonant Energy Transfer; Qubits; Exciton Qubits; Coupled Quantum Dots; Tunable Exciton Relaxation; Exciton Lifetimes;

Recommended Citations

Citations

  • Rolon Soto, J. E. (2011). Coherent Exciton Phenomena in Quantum Dot Molecules [Doctoral dissertation, Ohio University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1314742055

    APA Style (7th edition)

  • Rolon Soto, Juan. Coherent Exciton Phenomena in Quantum Dot Molecules. 2011. Ohio University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1314742055.

    MLA Style (8th edition)

  • Rolon Soto, Juan. "Coherent Exciton Phenomena in Quantum Dot Molecules." Doctoral dissertation, Ohio University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1314742055

    Chicago Manual of Style (17th edition)

ohiou1314742055
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© 2011, all rights reserved.
This open access ETD is published by Ohio University and OhioLINK.