An InGaAs/GaAs quantum well ~QW! disordering technique using AlAs native oxide and thermal annealing is presented. Unlike dielectric cap disordering, the AlAs native oxide can be placed close to quantum wells allowing for a spatially selective disordering deep within multilayer structures. The QW energy shifts and spatial control of the disordering were studied with photoluminescence and cathod...

The optical polarization properties of staggered AlGaN-AlGaN/AlN quantum wells (QWs) are investigated using the theoretical model based on the k·p method. The numerical results show that the energy level order and coupling relation of the valence subband structure change in the staggered QWs and the trend is beneficial to TE polarized transition compared to that of conventional AlGaN/AlN QWs. A...

We present experimental evidence which demonstrates for the first time that small particles on substrates sit in deep potential-energy wells and, once floated out of these, can quasimelt between various local minima on shallow morphological free-energy surfaces. The energy needed to nucleate the quasimolten state is found to be orders of magnitude larger than that needed to sustain the state. T...

an accurate design of drip irrigation requires water quality analysis that helps attain a better emission uniformity coefficient. this study examined aquifer qualitative parameters in the north of khuzestan province to assess the applicability of groundwater in trickle irrigation systems. for this purpose, interpolation technology was used to map chemical parameters collected from 104 deep well...

Observations of magnetic fields on scales up to several Mpc are important for understanding cluster and largescale structure evolution. Our current census of such structures is heavily biased – towards fields of several μG, towards fields in deep potential wells, and towards high inferred field strengths in cooling flow and other clusters from improper analysis of rotation measure data. After r...

We use temperature and power-dependent photoluminescence spectroscopy to demonstrate efficient free exciton emission at room temperature in high quality, strongly confining Zn0.5Cd0.5Se/MgxZnyCd1KxKySe quantum wells. Our measurements indicate that at low temperatures (T!50 K), the luminescence is dominated by bound exciton emission. However, free exciton emission becomes dominant at high temper...

Atomic Bose-Einstein condensates are intrinsic many-body quantum systems. Many-body quantum effects become significant in low-dimensional systems and systems with strict symmetry constraints, degeneracy, or strong interaction. Examples include low-dimensional quantum gases, spinor condensates, rapidly rotating systems, strongly interacting systems, and condensed atoms loaded into deep multi-wel...

Strong broad photoluminescence similar to that observed in some materials grown by molecular beam epitaxy (MBE) has been observed in Si/Si, -,Ge,/Si quantum wells grown by chemical vapor deposition. As grown, the samples exhibited SiGe band-edge phonon-resolved bound-exciton luminescence, but after being self-implanted with silicon and annealed at 600 “C, a deep broad luminescence band 80-100 m...

Geothermal energy transported to earth surface through volcanoes and hydrothermal systems. Based on numerical model analysis of deep drilling and exploitation data of some Kamchatka and Kurile Islands geothermal reservoirs , and heat and mass flow rates estimations of some Kamchatka volcanoes , the following conceptual model of geothermal energy transport is suggested : if magma trapped in uppe...