We report the complex dielectric function of the quasi-one-dimensional chalcogenide Ta 2
NiSe 5, which undergoes a structural phase transition presumably associated with exciton …

We address the question of the origin of the recently discovered chiral property of the charge-
density-wave phase in 1 T-TiSe 2, which so far lacks a microscopic understanding. We …

Using a combination of infrared ellipsometry, time-domain terahertz spectroscopy, and far-
infrared reflectometry, we have obtained the ac-plane complex dielectric function of …

In low–electron density materials, interactions can lead to highly correlated quantum states
of matter. Ta2NiSe5, an excitonic insulator (EI) candidate, exists in a novel broken-symmetry …

An excitonic insulator, in which an optical gap is formed by exciton condensation, is
expected to exhibit large photoresponses. Here, we report the results of femtosecond …

An excitonic insulator (EI) is an unconventional quantum phase of matter in which excitons,
bound pairs of electrons and holes, undergo Bose-Einstein condensation, forming a …

We show that coupling to vibrational degrees of freedom can drive a semimetal excitonic-
insulator quantum phase transition in a one-dimensional two-band fc-electron system at …

The low-energy excitation properties of the excitonic condensate in the semimetal and
semiconducting materials are inspected in the extended Falicov-Kimball model. In the …

In this publication, details of the calculation of heat conductivity and thermal diffusivity,
compressibility, sound velocity and exciton-polaron dispersion will be shown. The properties …

The excitonic condensate in semimetal and semiconducting materials with the assistance of
the phonons in both the adiabatic and anti-adiabatic regimes has been investigated. In the …