scholarly journals Role of the Lifshitz topological transitions in the thermodynamic properties of graphene

RSC Advances ◽  
2020 ◽  
Vol 10 (46) ◽  
pp. 27387-27400
Author(s):  
V. N. Davydov
Keyword(s):  
Thermodynamic Properties ◽  
Topological Transition ◽  
Topological Transitions

The origin of the Lifshitz topological transition (LTT) and the 2D nature of the LTT in graphene has been established.

scholarly journals Role of temperature in the numerical analysis of CaO under high pressure

2010 ◽  
Vol 8 (1) ◽  
pp. 126-133 ◽  
Author(s):  
Purvee Bhardwaj ◽  
Sadhna Singh
Keyword(s):  
Phase Transition ◽  
High Pressure ◽  
Numerical Analysis ◽  
Thermodynamic Properties ◽  
Elastic Constants ◽  
Volume Change ◽  
Thermodynamical Properties ◽  
Phase Transition Pressure ◽  
Different Temperatures

AbstractIn this paper we focus on the elastic and thermodynamic properties of the B1 phase of CaO by using the modified TBP model, including the role of temperature. We have successfully obtained the phase transition pressure and volume change at different temperatures. In addition elastic constants and bulk modulus of B1 phase of CaO at different temperatures are discussed. Our results are comparable with the previous ones at high temperatures and pressures. The thermodynamical properties of the B1 phase of CaO are also predicted.

scholarly journals Topological transitions in an oscillatory driven liquid crystal cell

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Marcel G. Clerc ◽  
Michał Kowalczyk ◽  
Valeska Zambra
Keyword(s):  
Liquid Crystal ◽  
Topological States Of Matter ◽  
Low Frequency ◽  
Vortex State ◽  
Liquid Crystal Cell ◽  
Topological Transition ◽  
Exotic States ◽  
Crystal Cell ◽  
Topological States ◽  
Topological Transitions

Abstract Matter under different equilibrium conditions of pressure and temperature exhibits different states such as solid, liquid, gas, and plasma. Exotic states of matter, such as Bose–Einstein condensates, superfluidity, chiral magnets, superconductivity, and liquid crystalline blue phases are observed in thermodynamic equilibrium. Rather than being a result of an aggregation of matter, their emergence is due to a change of a topological state of the system. These topological states can persist out of thermodynamics equilibrium. Here we investigate topological states of matter in a system with injection and dissipation of energy by means of oscillatory forcing. In an experiment involving a liquid crystal cell under the influence of a low-frequency oscillatory electric field, we observe a transition from a non-vortex state to a state in which vortices persist, topological transition. Depending on the period and the type of the forcing, the vortices self-organise, forming square lattices, glassy states, and disordered vortex structures. The bifurcation diagram is characterised experimentally. A continuous topological transition is observed for the sawtooth and square forcings. The scenario changes dramatically for sinusoidal forcing where the topological transition is discontinuous, which is accompanied by serial transitions between square and glassy vortex lattices. Based on a stochastic amplitude equation, we recognise the origin of the transition as the balance between stochastic creation and deterministic annihilation of vortices. Numerical simulations show topological transitions and the emergence of square vortex lattice. Our results show that the matter maintained out of equilibrium by means of the temporal modulation of parameters can exhibit exotic states.

scholarly journals Engineering of the thermodynamic properties of bilayer graphene by atomic plane rotations: the role of the out-of-plane phonons

Nanoscale ◽  
2015 ◽  
Vol 7 (30) ◽  
pp. 12851-12859 ◽  
Author(s):  
Alexandr I. Cocemasov ◽  
Denis L. Nika ◽  
Alexander A. Balandin
Keyword(s):  
Thermodynamic Properties ◽  
Atomic Plane ◽  
Bilayer Graphene ◽  
Out Of Plane

Role of Si concentration on the thermodynamic properties of molybdenum silicides

Vacuum ◽  
2017 ◽  
Vol 141 ◽  
pp. 170-172 ◽  
Author(s):  
Yong Pan ◽  
Shuanglun Wang ◽  
Pengyu Mao ◽  
Chao Jin
Keyword(s):  
Thermodynamic Properties ◽  
Molybdenum Silicides

scholarly journals Influence of nitrogen on thermodynamic properties and plasma composition in discharge tube of CO-laser

2016 ◽  
Vol 37 (3) ◽  
pp. 31-43
Author(s):  
Galina M. Grigorian ◽  
Adam Cenian
Keyword(s):  
Thermodynamic Properties ◽  
Active Medium ◽  
Discharge Plasma ◽  
Nitrogen Addition ◽  
Plasma Chemical ◽  
Co Laser ◽  
Co Dissociation ◽  
Laser Discharge ◽  
Laser Active Medium

Abstract The role of the addition of nitrogen to the discharge plasma of CO lasers on thermodynamic properties and composition of the laser active medium is discussed here. It is shown that nitrogen addition improves laser characteristics and changes the composition of the laser active medium. The addition of nitrogen significantly decreases CO dissociation level and concentrations of C atoms created in plasma-chemical reactions of laser discharge.

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