Condenson state and its effects on thermoelectric properties in In₄Se₃

Peculiarities of soliton excitations in the In₄Se₃ crystal

“…Since there is a possibility to change these parameters and also the intensity of the electron-phonon interaction by means of the external factors (pressure or impurities) [20,22,23], the possibility of the controlled solitary wave's propagation (different width, shape, and height) occurs. It discovers the new perspective applications for the In4Se3 crystal, for instance, in the nonlinear optics.…”

“…The condition for the condenson states is fulfilled in 3D-In4Se3 crystal due to its peculiar dispersion law for charge carries, which contains the second and fourth order components of the wave vectors, and to the peak-like density of electron states [11]. In the first time, the concept of condenson states in the three-dimensional In4Se3 crystal was used for the explanation of the high thermoelectric performance [22,23], which appeared to be larger than 1.4 at 705 K [18]. Experimental investigations of the charge and thermic transport suggest the existence of the condenson states in the In4Se3 layered crystal [22,23].…”

“…In the first time, the concept of condenson states in the three-dimensional In4Se3 crystal was used for the explanation of the high thermoelectric performance [22,23], which appeared to be larger than 1.4 at 705 K [18]. Experimental investigations of the charge and thermic transport suggest the existence of the condenson states in the In4Se3 layered crystal [22,23].…”

Condenson states dynamics in the layered crystals of the indium selenides under elastic deformations

“…For the first time we have shown that the charge inhomogeneity in the form of the "multicondenson drops" (early it was possible for only the onedimensional materials) is realized in the layered In4Se3 crystal owing to its dispersion law with low-energy non-parabolicity and peak-like density of states of E -1/4 type [4,5]. Today, the developed by us condenson state concept for the In4Se3 crystal is used [8,9] for the explanation of its unique high thermoelectric figure of merit [10]. Considering the thermoelectric properties of the In4Se3 [8,9] we experimentally corroborate the existence of the condenson states in this crystal.…”

Peculiarities of Chemical Bonding in Crystals of the In-Se System

“…The results of our earlier calculations have shown that in the case of β-InSe and In 4 Se 3 crystals, the inverse anisotropy of their chemical bonding in the real space is a main factor leading to the anomalous behavior of the dispersion law of charge carriers, which manifests itself as a low-energy nonparabolicity of the valence and conduction band extrema [10]. This peculiar shape of the dispersion law of charge carriers in In 4 Se 3 is crucial for the creation of the localized electron condenson states that seem to be responsible for the enhanced thermoelectric properties of this semiconductor [11,12]. Our calculation results show that similar features of the dispersion laws occur in the band spectra of two further layered polytypes of InSe crystal, the ε-InSe (in the Γ point) and γ-InSe (vicinity of A point) (Fig.…”