Emergence of the Dirac Electron System in a Single-Component Molecular Conductor under High Pressure

2017 ◽  
Vol 139 (5) ◽  
pp. 1770-1773 ◽  
Author(s):  
Reizo Kato ◽  
HengBo Cui ◽  
Takao Tsumuraya ◽  
Tsuyoshi Miyazaki ◽  
Yoshikazu Suzumura
Keyword(s):  
High Pressure ◽  
Electron System ◽  
Single Component ◽  
Molecular Conductor ◽  
Dirac Electron

Single-component molecular conductor [Pt(dmdt)2]—a three-dimensional ambient-pressure molecular Dirac electron system

2019 ◽  
Vol 55 (23) ◽  
pp. 3327-3330 ◽  
Author(s):  
Biao Zhou ◽  
Shoji Ishibashi ◽  
Tatsuru Ishii ◽  
Takahiko Sekine ◽  
Ryosuke Takehara ◽  
...  
Keyword(s):  
Ambient Pressure ◽  
Three Dimensional ◽  
Electron System ◽  
Single Component ◽  
Nodal Lines ◽  
Molecular Conductor ◽  
System P ◽  
Dirac Electron

[Pt(dmdt)2], an air-stable single-component molecular conductor, contains massless Dirac electrons and carries Dirac nodal lines at ambient pressure.

scholarly journals High-Pressure Crystal Structure and Unusual Magnetoresistance of a Single-Component Molecular Conductor [Pd(dddt)2] (dddt = 5,6-dihydro-1,4-dithiin-2,3-dithiolate)

Crystals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 534
Author(s):  
Hengbo Cui ◽  
Hamish H.-M. Yeung ◽  
Yoshitaka Kawasugi ◽  
Takaaki Minamidate ◽  
Lucy K. Saunders ◽  
...  
Keyword(s):  
Crystal Structure ◽  
High Pressure ◽  
Three Dimensional ◽  
Structural Disorder ◽  
Electron System ◽  
Experimental Information ◽  
Crystal Structure Analysis ◽  
Single Component ◽  
Unusual Behavior ◽  
Dirac Electron

A single-component molecular crystal [Pd(dddt)2] has been shown to exhibit almost temperature-independent resistivity under high pressure, leading theoretical studies to propose it as a three-dimensional (3D) Dirac electron system. To obtain more experimental information about the high-pressure electronic states, detailed resistivity measurements were performed, which show temperature-independent behavior at 13 GPa and then an upturn in the low temperature region at higher pressures. High-pressure single-crystal structure analysis was also performed for the first time, revealing the presence of pressure-induced structural disorder, which is possibly related to the changes in resistivity in the higher-pressure region. Calculations based on the disordered structure reveal that the Dirac cone state and semiconducting state coexist, indicating that the electronic state at high pressure is not a simple Dirac electron system as previously believed. Finally, the first measurements of magnetoresistance on [Pd(dddt)2] under high pressure are reported, revealing unusual behavior that seems to originate from the Dirac electron state.

scholarly journals Ambient-pressure Dirac electron system in the quasi-two-dimensional molecular conductor α−(BETS)2I3

2021 ◽  
Vol 103 (3) ◽  
Author(s):  
Shunsuke Kitou ◽  
Takao Tsumuraya ◽  
Hikaru Sawahata ◽  
Fumiyuki Ishii ◽  
Ko-ichi Hiraki ◽  
...  
Keyword(s):  
Ambient Pressure ◽  
Electron System ◽  
Two Dimensional ◽  
Molecular Conductor ◽  
Dirac Electron

scholarly journals Electronic Structure of a Single-Component Molecular Conductor [Pd(dddt)2] (dddt = 5,6-dihydro-1,4-dithiin-2,3-dithiolate) under High Pressure

2020 ◽  
Vol 89 (12) ◽  
pp. 124706
Author(s):  
Reizo Kato ◽  
Hengbo Cui ◽  
Takaaki Minamidate ◽  
Hamish H.-M. Yeung ◽  
Yoshikazu Suzumura
Keyword(s):  
High Pressure ◽  
Electronic Structure ◽  
Single Component ◽  
Molecular Conductor

Numerical Study of Bicomponent Droplet Vaporization in a High Pressure Environment

1996 ◽  
Author(s):  
J. Stengele ◽  
H.-J. Bauer ◽  
S. Wittig
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Gas Phase ◽  
Numerical Study ◽  
Droplet Evaporation ◽  
Single Component ◽  
Vapor Concentration ◽  
Diffusion Limit ◽  
Evaporation Process ◽  
Droplet Vaporization

The understanding of multicomponent droplet evaporation in a high pressure and high temperature gas is of great importance for the design of modern gas turbine combustors, since the different volatilities of the droplet components affect strongly the vapor concentration and, therefore, the ignition and combustion process in the gas phase. Plenty of experimental and numerical research is already done to understand the droplet evaporation process. Until now, most numerical studies were carried out for single component droplets, but there is still lack of knowledge concerning evaporation of multicomponent droplets under supercritical pressures. In the study presented, the Diffusion Limit Model is applied to predict bicomponent droplet vaporization. The calculations are carried out for a stagnant droplet consisting of heptane and dodecane evaporating in a stagnant high pressure and high temperature nitrogen environment. Different temperature and pressure levels are analyzed in order to characterize their influence on the vaporization behavior. The model employed is fully transient in the liquid and the gas phase. It accounts for real gas effects, ambient gas solubility in the liquid phase, high pressure phase equilibrium and variable properties in the droplet and surrounding gas. It is found that for high gas temperatures (T = 2000 K) the evaporation time of the bicomponent droplet decreases with higher pressures, whereas for moderate gas temperatures (T = 800 K) the lifetime of the droplet first increases and then decreases when elevating the pressure. This is comparable to numerical results conducted with single component droplets. Generally, the droplet temperature increases with higher pressures reaching finally the critical mixture temperature of the fuel components. The numerical study shows also that the same tendencies of vapor concentration at the droplet surface and vapor mass flow are observed for different pressures. Additionally, there is almost no influence of the ambient pressure on fuel composition inside the droplet during the evaporation process.

scholarly journals Formation of a two-dimensional single-component correlated electron system and band engineering in the nickelate superconductor NdNiO2

2019 ◽  
Vol 100 (20) ◽  
Author(s):  
Yusuke Nomura ◽  
Motoaki Hirayama ◽  
Terumasa Tadano ◽  
Yoshihide Yoshimoto ◽  
Kazuma Nakamura ◽  
...  
Keyword(s):  
Electron System ◽  
Single Component ◽  
Two Dimensional ◽  
Band Engineering ◽  
Correlated Electron ◽  
Correlated Electron System

Single-Component Molecular Conductor [Cu(tmdt)2] Containing an Antiferromagnetic Heisenberg Chain

2010 ◽  
Vol 49 (14) ◽  
pp. 6740-6747 ◽  
Author(s):  
Biao Zhou ◽  
Hiroyuki Yajima ◽  
Akiko Kobayashi ◽  
Yoshinori Okano ◽  
Hisashi Tanaka ◽  
...  
Keyword(s):  
Single Component ◽  
Heisenberg Chain ◽  
Molecular Conductor
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