An organometallic half-sandwich supramolecular complex {K(18-Crown-6)(ηn-C6H5B(C6H5)3)} (n = 1–6) exhibiting a reversible breaking-symmetry phase transition and switchable dielectric behaviour

2018 ◽  
Vol 47 (47) ◽  
pp. 16835-16839 ◽  
Author(s):  
Guo-Jun Yuan ◽  
Dong-Sheng Shao ◽  
Zhi-Yuan Yao ◽  
Wen-Long Liu ◽  
Xiao-Ming Ren
Keyword(s):  
Phase Transition ◽  
Sandwich Structure ◽  
Dielectric Behavior ◽  
Supramolecular Complex ◽  
Dielectric Behaviour ◽  
Symmetry Phase ◽  
Half Sandwich ◽  
Breaking Symmetry

An organometallic supramolecular crystal of {K(18-crown-6)(ηn-C6H5B(C6H5)3)} (n = 1–6) has a half-sandwich structure and exhibits a reversible breaking-symmetry phase transition and switchable dielectric behavior.

First-principles study on the heterostructure of twisted graphene/hexagonal boron nitride/graphene sandwich structure

2021 ◽  
Author(s):  
Yiheng Chen ◽  
Wen-Ti Guo ◽  
Zi-si Chen ◽  
Suyun Wang ◽  
Jian-Min Zhang
Keyword(s):  
Phase Transition ◽  
Boron Nitride ◽  
Charge Density ◽  
First Principles ◽  
Sandwich Structure ◽  
Hexagonal Boron Nitride ◽  
Mulliken Population ◽  
Metal Insulator ◽  
Insulator Phase Transition ◽  
Twisted Graphene

Abstract In recent years, the discovery of "magic angle" graphene has given new inspiration to the formation of heterojunctions. Similarly, the use of hexagonal boron nitride, known as white graphene, as a substrate for graphene devices has more aroused great interest in the graphene/hexagonal boron nitride (G/hBN) heterostructure system. Based on the first principles method of density functional theory, the band structure, density of states, Mulliken population, and differential charge density of a tightly packed model of twisted graphene/hexagonal boron nitride/graphene (G/hBN/G) sandwich structure have been studied. Through the establishment of heterostructure models TBG inserting hBN with different twisted angles, it was found that the band gap, Mulliken population, and charge density, exhibited specific evolution regulars with the rotation angle of the upper graphene, showing novel electronic properties and realizing metal-insulator phase transition. We find that the particular value of the twist angle at which the metal-insulator phase transition occurs and propose a rotational regulation mechanism with angular periodicity. Our results have guiding significance for the practical application of heterojunction electronic devices.

$\mathcal{PT}$ symmetry phase transition of the trimer lattices with balanced gain and loss

2017 ◽  
Vol 120 (2) ◽  
pp. 21002
Author(s):  
Jiankang Wang ◽  
Yuanhao Dong ◽  
Xiao-Tao Xie
Keyword(s):  
Phase Transition ◽  
Pt Symmetry ◽  
Symmetry Phase ◽  
Gain And Loss

Phase Transition Triggered by Ordering of Unique Pendulum-Like Motions in a Supramolecular Complex: Potassium Hydrogen Bis(dichloroacetate)-18-Crown-6

2013 ◽  
Vol 13 (6) ◽  
pp. 2675-2679 ◽  
Author(s):  
Shigeng Li ◽  
Junhua Luo ◽  
Zhihua Sun ◽  
Shuquan Zhang ◽  
Lina Li ◽  
...  
Keyword(s):  
Phase Transition ◽  
Supramolecular Complex ◽  
Potassium Hydrogen

Broken symmetry phase transition in solid p-H2, o-D2 and HD: crystal field effects

1999 ◽  
Vol 265 (1-4) ◽  
pp. 12-15 ◽  
Author(s):  
Yu.A Freiman ◽  
R.J Hemley ◽  
A Jezowski ◽  
S.M Tretyak
Keyword(s):  
Phase Transition ◽  
Crystal Field ◽  
Broken Symmetry ◽  
Field Effects ◽  
Symmetry Phase

Observation of a Parity-Time-Symmetry Phase Transition in a Fiber Cavity

2017 ◽  
Author(s):  
Ali K. Jahromi ◽  
Absar U. Hassan ◽  
Demetrois N. Christodoulides ◽  
Ayman F. Abouraddy
Keyword(s):  
Phase Transition ◽  
Time Symmetry ◽  
Symmetry Phase

THE GROUNDSTATES AND PHASES OF THE TWO-DIMENSIONAL FULLY FRUSTRATED XY MODEL

2009 ◽  
Vol 23 (20n21) ◽  
pp. 3939-3950
Author(s):  
PETTER MINNHAGEN ◽  
SEBASTIAN BERNHARDSSON ◽  
BEOM JUN KIM
Keyword(s):  
Phase Transition ◽  
Phase Diagram ◽  
Phase Transitions ◽  
Xy Model ◽  
Two Dimensional ◽  
Spin Configuration ◽  
Multicritical Points ◽  
Symmetry Phase

The 2D Fully Frustrated XY(FFXY) class of models is shown to contain a new groundstate in addition to the checkerboard groundstate of the standard 2D XY model. The spin configuration of this additional groundstate is obtained and its connection to a broken Z2-symmetry explained. This means that the class of 2D FFXY models belongs within a U(1) ⊗ Z2 ⊗ Z2-symmetry phase-transition representation. The phase diagram is reviewed and the central charges of the four multicritical points described. The implications for the standard 2D FFXY-model are discussed and elucidated, in particular with respect to the long standing controversy concerning the phase transitions of the standard 2D FFXY-model.

Sign in / Sign up

Export Citation Format

Share Document