@article{DO_NGUYEN_2021, title={Phase Diagrams of the Excitonic Insulator State: Analyzing the Excitonic Susceptibility}, volume={1}, url={https://inzynieriamineralna.com.pl/index.php/testowe/article/view/238}, DOI={10.29227/IM-2021-02-17}, abstractNote={<p>In this paper, the formation of the excitonic insulator state in the rare-earth chalcogenides has<br>been investigated through the extended Falicov-Kimball model. Adapting the unrestricted Hartree-Fock<br>approximation, we have derived a set of explicitly self-consistent equations determining expectation<br>values and the excitonic susceptibility in the system. Analyzing the excitonic susceptibility, we have<br>established phase diagrams of the excitonic insulator state depending on the model parameters. The phase<br>structures confirmed the excitonic insulator state is found at low temperature and between two critical<br>values of the Coulomb interaction. The effect of the external pressure on the formation of the excitonic<br>insulator state is also shown.</p&gt;}, number={2}, journal={Inżynieria Mineralna}, author={DO , Thi Hong Hai and NGUYEN , Thi Hau}, year={2021}, month={grudz.} }