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Arshak L. Vartanian Mkrtich A. Yeranosyan Albert A. Kirakosyan 《Physica B: Condensed Matter》2007,390(1-2):256-262
The hydrogenic impurity binding energy in rectangular quantum well wire including both barriers of finite height and an applied electric field are studied. The polaron effects on the ground-state binding energy in electric field are investigated by means of Landau-Pekar variation technique. The results for the binding energy as well as polaronic correction are obtained as a function of the size of the wire, the applied electric field and the position of the impurity. Our calculations are compared with previous results in quantum wires of comparable dimensions. 相似文献
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A. Poghossian S. Ingebrandt M.H. Abouzar M.J. Schöning 《Applied Physics A: Materials Science & Processing》2007,87(3):517-524
The possibilities and limitations of a direct electrical detection of charged macromolecules using a field-effect-based sensor
platform is evaluated, mainly focusing on capacitive EIS (electrolyte-insulator-semiconductor) devices. The experimentally
obtained results on the detection of DNA immobilisation and hybridisation as well as the monitoring of layer-by-layer adsorbed
charged polyelectrolyte (PE) multilayers have been discussed by using two basic possible mechanisms of signal generation,
namely the intrinsic charge of the macromolecules and the charge redistribution within the intermolecular spaces or in the
multilayer. The effects of the layer-by-layer adsorption conditions (unbuffered and pH buffer solution), and the number and
polarity of charged layers on the sensor response have been systematically investigated by means of capacitance–voltage (C–V),
constant–capacitance (ConCap) and impedance spectroscopy (IS) methods.
PACS 82.47.Rs; 82.80.Fk; 85.30.Tv; 87.15.Kg; 87.14.Gg 相似文献
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Arshak L. Vartanian Mkrtich A. Yeranosyan Albert A. Kirakosyan 《Physica E: Low-dimensional Systems and Nanostructures》2005,27(4):447-456
Using a variational technique, the effect of electron-longitudinal optical (LO) phonon interaction on the ground and the first few excited states of a hydrogenic impurity in a semiconductor quantum wire of rectangular cross section under an external electric field is studied theoretically for the impurity atom doped at various positions. The results for the binding energy as well as polaronic correction are obtained as a function of the size of the wire, the applied uniform electric field and the position of the impurity. It is found that the presence of optical phonons changes significantly the values of the impurity binding energies of the system. Taking into account the electron–LO phonon interaction the 1s→2py and 1s→2pz transition energies are calculated as a function of applied electric field for different impurity positions. 相似文献
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We study a parabolic free boundary problem with a fixed gradient condition which serves as a simplified model for the propagation
of premixed equidiffusional flames. We give a rigorous justification of an example due to J.L. Vázquez that the initial data
in the form of two circular humps leads to the nonuniqueness of limit solutions if the supports of the humps touch at the
time of their maximal expansion.
A. Petrosyan was supported in part by NSF grant DMS-0701015.
N.K. Yip was supported in part by NSF grant DMS-0406033. 相似文献
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Donatella Danielli Arshak Petrosyan 《Calculus of Variations and Partial Differential Equations》2005,23(1):97-124
In this paper we prove
regularity (near flat points) of the free boundary
0\}\cap\Omega$" align="middle" border="0">
in the Alt-Caffarelli type minimum problem for the p-Laplace operator:
0\}}\right)dx\rightarrow \min\qquad
(1
Received: 3 June 2003, Accepted: 9 June 2004, Published online: 8 February 2005Mathematics Subject Classification (2000): 35R35, 35J60The first author is partially supported by NSF Grant DMS-0202801 and NSF CAREER Grant DMS-0239771 相似文献
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Luis Caffarelli Arshak Petrosyan Henrik Shahgholian 《Journal of the American Mathematical Society》2004,17(4):827-869
We study the regularity of the free boundary in a Stefan-type problem
with no sign assumptions on and the time derivative .
with no sign assumptions on and the time derivative .
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