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Intermediate coupling theory of electronic ferroelectricity.
C D Batista1, J E Gubernatis, J Bonca
1Center for Nonlinear Studies and Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
Physical Review Letters
|June 1, 2004
Summary
We calculated the quantum phase diagram of an extended Falicov-Kimball model, finding Bose-Einstein condensation of excitons with electric polarization. Hybridization removed the condensate but strengthened ferroelectricity in these condensed matter systems.
Area of Science:
- Condensed matter physics
- Quantum mechanics
- Materials science
Background:
- The extended Falicov-Kimball model describes electron-hole interactions in materials.
- Understanding quantum phase diagrams is crucial for discovering novel electronic properties.
Purpose of the Study:
- To calculate the quantum phase diagram of an extended Falicov-Kimball model in 1D and 2D systems.
- To investigate the role of excitonic condensation and ferroelectricity in the intermediate coupling regime.
Main Methods:
- Analytical calculations for some phase diagram features.
- Constrained path Monte Carlo technique for main results.
- Analysis of one- and two-dimensional systems.
Main Results:
- The intermediate coupling regime is dominated by Bose-Einstein condensation of excitons.
- Excitons exhibit built-in electric polarization.
- Finite hybridization between bands suppresses the condensate.
- Hybridization enhances ferroelectric properties.
Conclusions:
- Excitonic Bose-Einstein condensation is a key feature in this model.
- Hybridization plays a critical role in tuning electronic and ferroelectric properties.
- The study provides insights into the complex interplay of interactions in quantum materials.