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Identifying an Environment-Induced Localization Transition from Entropy and Conductance
Zhanyu Ma1, Cheolhee Han1, Yigal Meir2
1School of Physics and Astronomy, Tel Aviv University, Tel Aviv 6997801, Israel.
Physical Review Letters
|October 6, 2023
Summary
Researchers observed environment-induced localization transitions (LT) in quantum systems. They measured entropy changes during these transitions, revealing a universal jump in spin-bath interactions and a discontinuity in quantum point contact conductance.
Area of Science:
- Quantum physics
- Condensed matter physics
Background:
- Environment-induced localization transitions (LT) occur when quantum systems interact with harmonic oscillator baths.
- These transitions are linked to entropy changes and loss of coherence at equilibrium.
- Observing equilibrium LTs has been a significant challenge in quantum research.
Purpose of the Study:
- To demonstrate the experimental realization of the spin-boson model in double quantum dot systems.
- To measure the entropy change associated with localization transitions (LT).
- To investigate the behavior of spin-bath interactions and quantum point contact (QPC) conductance during LTs.
Main Methods:
- Utilizing ongoing experiments on double quantum dots.
- Employing a nearby quantum point contact (QPC) to measure entropy.
- Analyzing the system within the framework of the spin-boson model.
Main Results:
- The experiments successfully realize the spin-boson model.
- A Kosterlitz-Thouless flow diagram was identified.
- A universal jump in spin-bath interaction was observed, indicated by a discontinuity in zero-temperature QPC conductance.
Conclusions:
- The study provides the first observation of equilibrium localization transitions (LT).
- The findings confirm the theoretical predictions of the spin-boson model.
- The results open new avenues for studying quantum coherence and entanglement in open quantum systems.
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