Sum Rules, Structure Factors, and Phonon Dispersion in LiquidHe4at Long Wavelengths and Low Temperatures

1970 ◽  
Vol 25 (3) ◽  
pp. 197-197 ◽  
Author(s):  
David Pines ◽  
Chia-Wei Woo
Keyword(s):  
Low Temperatures ◽  
Sum Rules ◽  
Phonon Dispersion ◽  
Structure Factors

Structure factors and phonon dispersion in liquid Li0.61Na0.39 alloy

Pramana ◽  
2004 ◽  
Vol 63 (2) ◽  
pp. 431-435 ◽  
Author(s):  
Arun Pratap ◽  
Kirit N. Lad ◽  
K. G. Raval
Keyword(s):  
Phonon Dispersion ◽  
Structure Factors

First-principles study of stability and electronic properties of single-element 2D materials

Doklady BGUIR ◽  
2022 ◽  
Vol 19 (8) ◽  
pp. 92-98
Author(s):  
D. C. Hvazdouski
Keyword(s):  
Mechanical Properties ◽  
Ab Initio Calculations ◽  
First Principles ◽  
Low Temperatures ◽  
Software Package ◽  
Phonon Dispersion ◽  
2D Materials ◽  
Single Element ◽  
Displacement Method ◽  
Phonon Dispersion Curves

We have estimated stability of single-element 2D materials (C2, N2, Si2, P2, Ge2, As2, Sn2, Sb2, Pb2, and Bi2) by ab initio calculations. The calculations of structural and mechanical properties of 2D materials were performed using the VASP software package. The results of calculations of stiffness tensors, Young's modulus, and Poisson's ratios show that all studied single-element 2D materials are mechanically stable. Dynamic stability was investigated by calculating the phonon dispersion of the materials using the finite displacement method. Only Pb2 has imaginary modes in the phonon dispersion curves and therefore it has dynamic unstable structure at low temperatures. The analysis of the band structures indicates the presence of insulators (N2), semiconductors (P2, As2, Bi2, Sb2), semimetals, and metals among the studied group of single-element 2D materials.

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