Self-consistent Monte Carlo device simulations under nano-scale device structures: role of Coulomb interaction, degeneracy, and boundary condition

2009 ◽  
Author(s):  
Kohei Nakanishi ◽  
Tadayoshi Uechi ◽  
Nobuyuki Sano
Keyword(s):  
Boundary Condition ◽  
Monte Carlo ◽  
Coulomb Interaction ◽  
Nano Scale ◽  
Device Structures ◽  
Self Consistent

Quasi-Ballistic Transport in Nano-Scale Devices: Boundary Layer, Potential Fluctuation, and Coulomb Interaction

2011 ◽  
Vol 470 ◽  
pp. 207-213
Author(s):  
Nobuyuki Sano ◽  
Takahiko Karasawa
Keyword(s):  
Boundary Layer ◽  
Coulomb Interaction ◽  
Physical Mechanism ◽  
Layer Structure ◽  
Ballistic Transport ◽  
Boltzmann Transport ◽  
Virtual Source ◽  
Layer Potential ◽  
Nano Scale ◽  
Device Structures

The singular nature of the Boltzmann transport equation leads to the boundary layer structure around the virtual source in nano-scale device structures. We show that the boundary layer is a key concept to understand the physical mechanism behind quasi-ballistic transport in nano-scale devices. The self-consistent 3D Monte Carlo device simulator is constructed by accurately including the full Coulomb interaction. It is explicitly shown that the Coulomb interaction is indeed a key ingredient for any reliable predictions of device characteristics.

scholarly journals Role of Nanocrystallites of Al-Based Glasses and H2O2 in Degradation Azo Dyes

Materials ◽  
2020 ◽  
Vol 14 (1) ◽  
pp. 39
Author(s):  
Qi Chen ◽  
Zhicheng Yan ◽  
Hao Zhang ◽  
KiBuem Kim ◽  
Weimin Wang
Keyword(s):  
Metallic Glasses ◽  
Azo Dye ◽  
Amorphous Matrix ◽  
Nano Scale ◽  
Transmission Electron ◽  
Melt Spun ◽  
Degradation Ability ◽  
Tem Transmission Electron Microscopy ◽  
Dye Solutions

Al-based metallic glasses have a special atomic structure and should have a unique degradation ability in azo dye solutions. The Al88Ni9Y3 (Y3), Al85Ni9Y6 (Y6) and Al82Ni9Y9 (Y9) glassy ribbons are melt spun and used in degrading methyl orange (MO) azo dye solution with adding H2O2. With increasing cY, the as-spun ribbons have an increasing GFA (glass formability) and gradually decreased the degradation rate of MO solution. TEM (transmission electron microscopy) results show that the Y3 ribbon has nano-scale crystallites, which may form the channels to transport elements to the surface for degrading the MO solution. After adding H2O2, the degradation efficiency of Al-based glasses is improved and the Y6 ribbon has formed nano-scale crystallites embedded in the amorphous matrix and it has the largest improvement in MO solution degradation. These results indicate that forming nano-scale crystallites and adding H2O2 are effective methods to improve the degradation ability of Al-based glasses in azo dye solutions.

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