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Published on: October 13, 2017
Thermal effects on photon-induced quantum transport in a single quantum dot
M O Assunção1, E J R de Oliveira, J M Villas-Bôas
1Instituto de Física, Universidade Federal de Uberlândia, Uberlândia, MG, Brazil.
Summary
We explored laser-driven quantum transport in quantum dots, revealing how temperature and laser intensity control electron flow and Rabi oscillations. This research offers insights into managing quantum phenomena for potential applications.
Area of Science:
- Quantum Physics
- Condensed Matter Theory
- Nanotechnology
Background:
- Quantum dots are crucial nanoscale systems for studying quantum phenomena.
- Understanding laser-induced quantum transport is key for quantum technologies.
- Non-Markovian effects and decoherence significantly impact quantum system dynamics.
Purpose of the Study:
- To theoretically investigate laser-induced quantum transport in a single quantum dot.
- To analyze the influence of thermal effects and decoherence on quantum transport.
- To explore the role of laser intensity and temperature in controlling photocurrent and excitonic dynamics.
Main Methods:
- Utilized a nonequilibrium Green function technique to model quantum transport.
- Incorporated thermal effects and non-Markovian dynamics into the theoretical framework.
- Solved coupled integrodifferential equations for correlation and propagator functions.
Main Results:
- Identified incoherent tunneling and thermal fluctuations as sources of decoherence in Rabi oscillations.
- Observed a temperature-dependent suppression of Rabi oscillations due to thermally activated Pauli blockade.
- Demonstrated a current sign switch and tunable stationary current by manipulating laser intensity and temperature.
Conclusions:
- Laser-driven quantum transport in quantum dots is significantly influenced by thermal effects and decoherence.
- Pauli blockade and Rabi oscillation suppression are temperature-dependent phenomena.
- Precise control over laser intensity and temperature allows for optimization of photocurrent and quantum dot behavior.
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