Nonequilibrium Response of Nanosystems Coupled to Driven Quantum Baths

Area of Science:

• Quantum physics
• Nanoscience
• Materials science

Background:

• Nanosystems often interact with external fields and environmental fluctuations.
• The influence of external fields on the environment is typically ignored in macroscopic systems but is crucial at the nanoscale.
• Standard linear response theory for quantum dissipative systems needs extension for strongly driven environments.

Purpose of the Study:

• To extend linear response theory to account for strongly driven environments in quantum dissipative systems.
• To investigate the impact of driven environments on the polarizability of molecules and the response of semiconductor quantum dots.

Main Methods:

• Extension of the standard linear response theory.
• Evaluation of molecular polarizability in a polarizable medium subjected to terahertz radiation.
• Analysis of a semiconductor quantum dot near a metallic nanoparticle in a polarizable medium under electromagnetic irradiation.

Main Results:

• A significant increase (approx. 30%) in molecular polarizability was observed.
• The response of the quantum dot was qualitatively altered by the driven nanoparticle.
• An additional channel for stimulated emission in the quantum dot system was identified.

Conclusions:

• The interaction between external fields and the environment is significant at the nanoscale and cannot be neglected.
• The developed theory provides new insights into the behavior of nanosystems in driven environments.
• These findings have implications for understanding and designing nanodevices interacting with electromagnetic fields.