Поиск сотрудников физического факультета
Кафедра квантовой электроники
Фамилия: Орешкин
Имя: Андрей
Отчество: Иванович
Ученая степень: кандидат физ-мат. наук
Комната: КНО 404
Должность: старший научный сотрудник
Телефон: 939-25-02
Факс: 939-11-04
Email: oreshkin@smplab.phys.msu.su
Страница в интернете: http://spmlab.phys.msu.su/
Научные интересы: The ultrahigh vacuum plant (base pressure is order 10-8 Pa) for surface investigation by LEED and STM methods have been designed. Test measurements by STM/STS and LEED methods have been performed.
New dimensional quantization effects (DQE) in the vicinity of artificially produced clusters on semiconductor surface and near nanodefects on HOPG surface were observed by means of STM/STS. It was shown than the interaction between neighbouring defects can lead to DQ level splitting. The effects have local character and differ from “zero anomalies” often observed in tunnel junctions.
Light-induced conformational transformation of the naphthacenequinone (NQ) molecules is observed by scanning tunneling microscopy and spectroscopy. Additional sub-band of empty electronic states has been found for NQ molecules in A form and not found in B form. The conformational transformation is connected with the transfer of the phenoxy group from one oxygen to another.
Local low temperature tunnelling spectroscopy was performed on the in vicinity of artificially produced nanodefects on HOPG surface. It was shown that shape of tunnelling spectra can be explained taking into account finite relaxation time of unequilibrium electrons and presence of localised states of tip. We ascribe different results of STM investigations at low temperature to prevailing role of charge effects at low temperature. This statement is surprisingly consistent with the idea that superstructures on HOPG surface are analogous to Friedel oscillations.
The STM for surface investigations in controllable gas environment was used to study hydrogen saturated palladium surface. A comparative analysis was made of the surface of a palladium sample which was subjected heat treatment in atmospheres of oxygen and hydrogen and the surface of untreated palladium. It was show that after some treatment the atomic resolution on -Pd surface can be obtained.
Основные публикации: Moiseev Yu.N., Oreshkin A.I., Oreshkin S.I., Stytsenko V.D., Vasil'ev S.I., Savinov S.V..Atomic-resolution scanning tunneling microscopy of a palladium surface..Sov. JETP Lett., 57, 321, 1993.
Oreshkin A.I., Oreshkin S.I., Savinov S.V., Panov V.I., Vasil'ev S.I., Rudenko A.I., Polonskii B.A., Protopopov O.D..Ultrahigh vacuum scanning tunneling microscope..Electronic Industry, 10, 43-44, 1993.
Moiseev Yu.N., Oreshkin A.I., Oreshkin S.I., Vasil'ev S.I., Savinov S.V., Scanning tunneling microscope for investigation of surface samples in inspection gas environment..Electronic Industry, 10, 37-38, 1993.
Moiseev Yu.N., Oreshkin A.I., Oreshkin S.I., Savinov S.V., Vasil'ev S.I., A scanning tunneling microscope operating in gas with the annealing of samples..Instruments and experimental Techniques, 37, No. 2, Part 2, 1994.
Maslova N.S., Oreshkin A.I., Savinov S.V., Kalachev A.A., Rabe J.P..STM evidence of dimensional quantization on the nanometer size surface defects..Sol. State Comm., 95, 8, 507-510, 1995.
Koroteev N.I., Magnitskii S.A., Oreshkin A.I., Panov V.I., Vasil’ev S.I...Direct STM observation of electron structure modification of naphtacenequinone molecules caused by photoisomerisation..JETP Lett., 68, 6, 521-526, 1998.
Magnitskii S.A., Maslova N.S., Oreshkin A.I., Panov V.I..Light-induced conformational transitions of individual molecules in ordered films..Solid State Communications 117, 41-46, 2001.
Maslova N.S., Oreshkin A.I., Oreshkin S.I., Panov V.I., Savinov S.V., Kalachev A.A.. The influence of Coulomb interaction of localized charges on low temperature STS spectra of surface nanodefects..J. Phys.: Condens. Matter 13, 1-8, 2001.