Robert Suris - Academia.edu (original) (raw)
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Homi Bhabha National Institute (HBNI, BARC, MUMBAI)
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Papers by Robert Suris
Fluctuation and Noise Letters, 2006
Bulk samples of double layered manganite La 1.4 Ca 1.6 Mn 2 O 7 were prepared by solid-state reac... more Bulk samples of double layered manganite La 1.4 Ca 1.6 Mn 2 O 7 were prepared by solid-state reaction method. Study of magnetotransport properties revealed a metal to insulator transition at 160 K, a ferromagnetic transition at 164 K and appearance of two-dimensional short range ferromagnetic correlations around 235 K. The temperature dependence of conduction noise showed three peaks at 114 K, 165 K and 235 K which are attributed to excess noise generated due to setting up of three-dimensional out-of-plane ferromagnetic transition, two-dimensional out-of-plane ferromagnetic transition temperatures and appearance of two-dimensional short range ferromagnetic correlations respectively. In the temperature region ~ 160 K, excess noise was also generated due to the metal-insulator transition. In the paramagnetic region, conduction noise was found to remain unchanged with the applied magnetic field whereas in the ferromagnetic regions, the peaks at 114 K and 235 K got disappeared. The latt...
Physics of the Solid State, 1998
Semiconductors, 2006
The localization of two-dimensional electron-hole complexes at the attractive potential of arbitr... more The localization of two-dimensional electron-hole complexes at the attractive potential of arbitrary shape is treated theoretically. A general method of construction of simple descriptive trial functions is suggested to calculate the binding energy of the ground state of such complexes. The limiting cases corresponding to different relations between the characteristic parameters of the system are analyzed. The developed approach is illustrated by particular calculations for the exciton in a two-dimensional quantum well with an additional lateral potential.
Jetp Letters - JETP LETT-ENGL TR, 1983
JETP Letters, 2011
ABSTRACT The energy-level structure of spatially indirect Coulomb complexes is investigated. Two ... more ABSTRACT The energy-level structure of spatially indirect Coulomb complexes is investigated. Two limiting cases that correspond to the two-dimensional hydrogen atom and planar isotropic harmonic oscillator are characterized by accidental degeneracy are considered. Numerical calculations are used to trace the evolution of the energy-level structure between these two limiting cases.
Journal of Physics D: Applied Physics, 1975
ABSTRACT The analytical theory of slow Gunn domains in the presence of trapping is outlined. The ... more ABSTRACT The analytical theory of slow Gunn domains in the presence of trapping is outlined. The current-voltage characteristic of the sample with the slow domain is derived. It is shown that all the results of the computer calculations of the slow-domain parameters (Kroemer 1972) are in the frame of an analytical theory (Kazarinov, and Suris 1971, Gelmont and Shur 1971, 1972). The theory also takes into account the essential field dependence of the electron capture cross section and predicts unusual resonance properties of the sample impedance in the presence of the slow Gunn domain.
Technical Physics Letters, Feb 1, 1975
Journal of Experimental and Theoretical Physics, Feb 1, 1983
The Tc-mapping method using low temperature scanning electron microscopy (LTSEM) has been develop... more The Tc-mapping method using low temperature scanning electron microscopy (LTSEM) has been developed to study the spatial distribution of the critical temperature in high temperature superconducting (HTSC) films with a spatial resolution approaching 2 µm. To achieve so high a spatial resolution, a numerical deconvolution method was applied that eliminated distorting effects associated with the thermal diffusion and with the contribution from the absorbed beam current. The Tcmapping method was used to investigate modification by water of YB32Cu 3 O 7 _x films grown on (100) MgO and (110) LaAIO 3 substrates. The rate of modification of a [110]-oriented YBa 2 Cu 3 O 7 _x/LaAIO 3 film is found to be 40 times that of a c-axis oriented YB32Cu 3 O 7 _x/MgO epitaxial film. It is argued that water-initiated modification of the films results from penetration of hydrogen into the films, rather than from out-diffusion of oxygen.
Quantum Electronics, 2022
In this work we theoretically analyze new type of tunable metamaterial for terahertz optics based... more In this work we theoretically analyze new type of tunable metamaterial for terahertz optics based on semiconductor superlattice. We show that the signs of the dielectric function tensor components of suggested metamaterial can be optically manipulated by incident light of the visible or near-infrared spectrum. Density of the photon states in the metamaterial is controlled by the incident light intensity.
In this work we theoretically analyze new type of tunable metamaterial for terahertz optics based... more In this work we theoretically analyze new type of tunable metamaterial for terahertz optics based on semiconductor superlattice. We show that the signs of the dielectric function tensor components of suggested metamaterial can be optically manipulated by incident light of the visible or near-infrared spectrum. Density of the photon states in the metamaterial is controlled by the incident light intensity.
Fluctuation and Noise Letters, 2006
Bulk samples of double layered manganite La 1.4 Ca 1.6 Mn 2 O 7 were prepared by solid-state reac... more Bulk samples of double layered manganite La 1.4 Ca 1.6 Mn 2 O 7 were prepared by solid-state reaction method. Study of magnetotransport properties revealed a metal to insulator transition at 160 K, a ferromagnetic transition at 164 K and appearance of two-dimensional short range ferromagnetic correlations around 235 K. The temperature dependence of conduction noise showed three peaks at 114 K, 165 K and 235 K which are attributed to excess noise generated due to setting up of three-dimensional out-of-plane ferromagnetic transition, two-dimensional out-of-plane ferromagnetic transition temperatures and appearance of two-dimensional short range ferromagnetic correlations respectively. In the temperature region ~ 160 K, excess noise was also generated due to the metal-insulator transition. In the paramagnetic region, conduction noise was found to remain unchanged with the applied magnetic field whereas in the ferromagnetic regions, the peaks at 114 K and 235 K got disappeared. The latt...
Physics of the Solid State, 1998
Semiconductors, 2006
The localization of two-dimensional electron-hole complexes at the attractive potential of arbitr... more The localization of two-dimensional electron-hole complexes at the attractive potential of arbitrary shape is treated theoretically. A general method of construction of simple descriptive trial functions is suggested to calculate the binding energy of the ground state of such complexes. The limiting cases corresponding to different relations between the characteristic parameters of the system are analyzed. The developed approach is illustrated by particular calculations for the exciton in a two-dimensional quantum well with an additional lateral potential.
Jetp Letters - JETP LETT-ENGL TR, 1983
JETP Letters, 2011
ABSTRACT The energy-level structure of spatially indirect Coulomb complexes is investigated. Two ... more ABSTRACT The energy-level structure of spatially indirect Coulomb complexes is investigated. Two limiting cases that correspond to the two-dimensional hydrogen atom and planar isotropic harmonic oscillator are characterized by accidental degeneracy are considered. Numerical calculations are used to trace the evolution of the energy-level structure between these two limiting cases.
Journal of Physics D: Applied Physics, 1975
ABSTRACT The analytical theory of slow Gunn domains in the presence of trapping is outlined. The ... more ABSTRACT The analytical theory of slow Gunn domains in the presence of trapping is outlined. The current-voltage characteristic of the sample with the slow domain is derived. It is shown that all the results of the computer calculations of the slow-domain parameters (Kroemer 1972) are in the frame of an analytical theory (Kazarinov, and Suris 1971, Gelmont and Shur 1971, 1972). The theory also takes into account the essential field dependence of the electron capture cross section and predicts unusual resonance properties of the sample impedance in the presence of the slow Gunn domain.
Technical Physics Letters, Feb 1, 1975
Journal of Experimental and Theoretical Physics, Feb 1, 1983
The Tc-mapping method using low temperature scanning electron microscopy (LTSEM) has been develop... more The Tc-mapping method using low temperature scanning electron microscopy (LTSEM) has been developed to study the spatial distribution of the critical temperature in high temperature superconducting (HTSC) films with a spatial resolution approaching 2 µm. To achieve so high a spatial resolution, a numerical deconvolution method was applied that eliminated distorting effects associated with the thermal diffusion and with the contribution from the absorbed beam current. The Tcmapping method was used to investigate modification by water of YB32Cu 3 O 7 _x films grown on (100) MgO and (110) LaAIO 3 substrates. The rate of modification of a [110]-oriented YBa 2 Cu 3 O 7 _x/LaAIO 3 film is found to be 40 times that of a c-axis oriented YB32Cu 3 O 7 _x/MgO epitaxial film. It is argued that water-initiated modification of the films results from penetration of hydrogen into the films, rather than from out-diffusion of oxygen.
Quantum Electronics, 2022
In this work we theoretically analyze new type of tunable metamaterial for terahertz optics based... more In this work we theoretically analyze new type of tunable metamaterial for terahertz optics based on semiconductor superlattice. We show that the signs of the dielectric function tensor components of suggested metamaterial can be optically manipulated by incident light of the visible or near-infrared spectrum. Density of the photon states in the metamaterial is controlled by the incident light intensity.
In this work we theoretically analyze new type of tunable metamaterial for terahertz optics based... more In this work we theoretically analyze new type of tunable metamaterial for terahertz optics based on semiconductor superlattice. We show that the signs of the dielectric function tensor components of suggested metamaterial can be optically manipulated by incident light of the visible or near-infrared spectrum. Density of the photon states in the metamaterial is controlled by the incident light intensity.