scholarly journals Excess noise in STM-style break junctions at room temperature

2012 ◽  
Vol 85 (23) ◽  
Author(s):  
Ruoyu Chen ◽  
Patrick J. Wheeler ◽  
D. Natelson
Keyword(s):  
Room Temperature ◽  
Excess Noise ◽  
Break Junctions

scholarly journals Low Noise Short Wavelength Infrared Avalanche Photodetector Using SB-Based Strained Layer Superlattice

Photonics ◽  
2021 ◽  
Vol 8 (5) ◽  
pp. 148
Author(s):  
Arash Dehzangi ◽  
Jiakai Li ◽  
Manijeh Razeghi
Keyword(s):  
Short Wavelength ◽  
Room Temperature ◽  
Molecular Beam ◽  
Impact Ionization ◽  
Low Noise ◽  
Excess Noise ◽  
Type Ii ◽  
Type Ii Superlattice ◽  
Strained Layer Superlattice ◽  
Ionization Coefficients

We demonstrate low noise short wavelength infrared (SWIR) Sb-based type II superlattice (T2SL) avalanche photodiodes (APDs). The SWIR GaSb/(AlAsSb/GaSb) APD structure was designed based on impact ionization engineering and grown by molecular beam epitaxy on a GaSb substrate. At room temperature, the device exhibits a 50% cut-off wavelength of 1.74 µm. The device was revealed to have an electron-dominated avalanching mechanism with a gain value of 48 at room temperature. The electron and hole impact ionization coefficients were calculated and compared to give a better prospect of the performance of the device. Low excess noise, as characterized by a carrier ionization ratio of ~0.07, has been achieved.

Conductance Quantization in Fully Integrated Break Junctions at Room Temperature

Nanowires ◽  
1997 ◽  
pp. 263-274
Author(s):  
C. Zhou ◽  
C. J. Muller ◽  
M. R. Deshpande ◽  
J. McCormack ◽  
M. A. Reed
Keyword(s):  
Room Temperature ◽  
Break Junctions ◽  
Fully Integrated ◽  
Conductance Quantization

scholarly journals Shot noise variation within ensembles of gold atomic break junctions at room temperature

2014 ◽  
Vol 26 (47) ◽  
pp. 474204 ◽  
Author(s):  
R Chen ◽  
M Matt ◽  
F Pauly ◽  
P Nielaba ◽  
J C Cuevas ◽  
...  
Keyword(s):  
Shot Noise ◽  
Room Temperature ◽  
Break Junctions

scholarly journals A non-oxidizing fabrication method for lithographic break junctions of sensitive metals

2020 ◽  
Vol 2 (9) ◽  
pp. 3829-3833
Author(s):  
Anna Nyáry ◽  
Agnes Gubicza ◽  
Jan Overbeck ◽  
László Pósa ◽  
Péter Makk ◽  
...  
Keyword(s):  
Room Temperature ◽  
Fabrication Method ◽  
Break Junctions ◽  
Oxygen Sensitive

An oxygen-free lithographical fabrication method enables room temperature atomic switches terminated by oxygen sensitive metals.

Epitaxial La0.7(Pb1−xSrx)0.3MnO3 Thin CMR Film Room Temperature Bolometer

1999 ◽  
Vol 602 ◽  
Author(s):  
A. Lisauskas ◽  
S.I. Khartsev ◽  
A.M. Grishin
Keyword(s):  
Heat Transfer ◽  
Room Temperature ◽  
Performance Test ◽  
Signal To Noise Ratio ◽  
Thermal Conductance ◽  
Frequency Dispersion ◽  
Excess Noise ◽  
High Signal ◽  
Continuous Series ◽  
Insulator Phase Transition

AbstractUsing pulsed laser deposition technique we fabricated films of a continuous series of solid solutions La0.7(Pb1−xSrx)0.3MnO3, which undergo metal-to-insulator phase transition close and above room temperature. The optimal composition for uncooled bolometer applications was found at x = 0.37 with maximum of TCR = 7.4 %K−1@ 295 K. Room temperature bolometer demonstrator has been built and tested. Relatively low excess noise (magnitude γ/n of 3·10−21 cm−3) and high TCR enabled achievement of high signal-to-noise ratio of 8·106 √-Hz/K. The observed frequency dispersion of bolometer response has been ascribed to three relaxation mechanisms of the heat transfer: from film thermistor to substrate, from substrate to thermostat, and heat transfer via leads. For fabricated bolometer heat transfer from substrate to thermostat was found to be the slowest one with a time constant of 0.5 s (correspondent substrate-to-thermostat thermal conductance is G = 3·10−3 W/K). Bolometer performance test yields the responsivity ℜ = 0.6 V/W, detectivity D = 9·106 cm√Hz/W and noise equivalent power NEP of 3·10−8 W/√Hz at 30 Hz frame frequency. Further improvement of bolometer thermal isolation using the micromachining technique is believed to achieve the responsivity about 4·103 V/W and detectivity higher than 109 cm√Hz/W@30 Hz.

Dependence of Intergranular Fracture on Boundary Topography and Cohesion

1973 ◽  
Vol 31 ◽  
pp. 150-151
Author(s):  
J. E. Doherty ◽  
A. F. Giamei ◽  
B. H. Kear ◽  
C. W. Steinke
Keyword(s):  
Grain Boundary ◽  
Room Temperature ◽  
Nickel Base Superalloy ◽  
Boundary Shear ◽  
Room Temperature Ductility ◽  
Solid Solution Matrix ◽  
Nickel Base ◽  
Solution Matrix ◽  
Different Levels ◽  
Base Superalloy

Recently we have been investigating a class of nickel-base superalloys which possess substantial room temperature ductility. This improvement in ductility is directly related to improvements in grain boundary strength due to increased boundary cohesion through control of detrimental impurities and improved boundary shear strength by controlled grain boundary micros true tures.For these investigations an experimental nickel-base superalloy was doped with different levels of sulphur impurity. The micros tructure after a heat treatment of 1360°C for 2 hr, 1200°C for 16 hr consists of coherent precipitates of γ’ Ni3(Al,X) in a nickel solid solution matrix.

Hepatocyte Alterations in Guinea Pigs FED Polychlorinated Biphenyls (PCBs), Dibenzodioxins (PCDD), AND DIBENZOFURANS (PCDF)

1982 ◽  
Vol 40 ◽  
pp. 56-57
Author(s):  
J. N. Turner ◽  
D. N. Collins
Keyword(s):  
Guinea Pigs ◽  
Room Temperature ◽  
Dose Group ◽  
Methyl Cellulose ◽  
Uranyl Acetate ◽  
Target Organ ◽  
Office Building ◽  
Lead Citrate ◽  
Control Groups ◽  
Cooling Fluid

A fire involving an electric service transformer and its cooling fluid, a mixture of PCBs and chlorinated benzenes, contaminated an office building with a fine soot. Chemical analysis showed PCDDs and PCDFs including the highly toxic tetra isomers. Guinea pigs were chosen as an experimental animal to test the soot's toxicity because of their sensitivity to these compounds, and the liver was examined because it is a target organ. The soot was suspended in 0.75% methyl cellulose and administered in a single dose by gavage at levels of 1,10,100, and 500mgm soot/kgm body weight. Each dose group was composed of 6 males and 6 females. Control groups included 12 (6 male, 6 female) animals fed activated carbon in methyl cellulose, 6 males fed methyl cellulose, and 16 males and 10 females untreated. The guinea pigs were sacrificed at 42 days by suffocation in CO2. Liver samples were immediately immersed and minced in 2% gluteraldehyde in cacadylate buffer at pH 7.4 and 4°C. After overnight fixation, samples were postfixed in 1% OsO4 in cacodylate for 1 hr at room temperature, embedded in epon, sectioned and stained with uranyl acetate and lead citrate.

Domain Formation in Synthetic Quartz

1971 ◽  
Vol 29 ◽  
pp. 156-157
Author(s):  
Joseph J. Comer
Keyword(s):  
Electron Beam ◽  
Room Temperature ◽  
Domain Formation ◽  
Synthetic Quartz ◽  
Transmission Electron ◽  
Black Spots ◽  
Diffraction Mode ◽  
Domain Boundaries ◽  
Kikuchi Lines ◽  
Straight Lines

Domains visible by transmission electron microscopy, believed to be Dauphiné inversion twins, were found in some specimens of synthetic quartz heated to 680°C and cooled to room temperature. With the electron beam close to parallel to the [0001] direction the domain boundaries appeared as straight lines normal to <100> and <410> or <510> directions. In the selected area diffraction mode, a shift of the Kikuchi lines was observed when the electron beam was made to traverse the specimen across a boundary. This shift indicates a change in orientation which accounts for the visibility of the domain by diffraction contrast when the specimen is tilted. Upon exposure to a 100 KV electron beam with a flux of 5x 1018 electrons/cm2sec the boundaries are rapidly decorated by radiation damage centers appearing as black spots. Similar crystallographio boundaries were sometimes found in unannealed (0001) quartz damaged by electrons.

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