A. Jayaraman

Nokia (United States)

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G. A. Kourouklis

Aristotle University of Thessaloniki

R. G. Maines

AT&T (United States)

Shiv K. Sharma

University of Hawaiʻi at Mānoa

Suresh Valiyaveettil

National University of Singapore

V.M. Balasubramaniam

The Ohio State University

E. Bücher

Saarland University

S. R. Shieh

Western University

G. C. Kennedy

Trinity College Dublin

S. Y. Wang

University of Hawaiʻi at Mānoa

B. Batlogg

ETH Zurich

Cooperative Institutions

AT&T (United States)

Nokia (United States)

Alcatel Lucent (Germany)

Indian Institute of Science Bangalore

Max Planck Institute for Solid State Research

Max Planck Society

University of Hawaii System

Massachusetts Institute of Technology

Los Alamos National Laboratory

Brookhaven National Laboratory

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The Ground State Decoherence Effect on an Amplification of a Phase Sensitive Δ System

Beena Pramoth A. Jayaraman SURESH BABU N

The atomic decoherence effect (DE) on electromagnetically induced transparency(EIT) is studied in the phase-sensitive ∆ system. The DE forces the susceptibility of the medium into negative or positive depending upon the resultant phase and the microwave field strength. In general, the phase-sensitive amplification (PSA) on the probe resonance laser field is induced by the microwave field. The DE plays a major role in tuning the PSA in such a medium. Moreover, we show that the control of the ground state decoherence in a phase-sensitive ∆ system leads to the gain in the output of the probe field. The DE is of great interest in the field of quantum information science, and quantum optics.

Electromagnetically Induced Transparency

Phase control

10.1364/opticaopen.23743101.v2

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Citations (0)

Diamond anvil cell and high-pressure physical investigations

Reviews of Modern Physics (1983)

A. Jayaraman

The present status of high-pressure research with the diamond anvil cell (DAC) is reviewed in this article, mainly from an experimental aspect. After a brief description of the different types of DAC's that are currently in vogue, the techniques used in conjunction with the DAC in modern high-pressure research are presented. These include techniques for low- and high-temperature studies, x-ray diffractometry, spectroscopy with the DAC, and other measurements. Results on selected materials, with a view to illustrating the physics behind high-pressure phenomena, are presented and discussed. These include metal-semiconductor transitions, electronic transitions, phonons and high-pressure lattice dynamics, and phase transitions. A whole section is devoted to the behavior of condensed gases, principally ${\mathrm{H}}_{2}$, ${\mathrm{D}}_{2}$, ${\mathrm{O}}_{2}$, ${\mathrm{N}}_{2}$, and rare-gas solids. The concluding section briefly deals with speculations on ultra-high-pressure research with the DAC in the future.

Diamond anvil cell

Lattice (music)

Section (typography)

10.1103/revmodphys.55.65

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Citations (1,274)

A high pressure raman study of ThO2 to 40 GPa and pressure-induced phase transition from fluorite structure

Pramana (1988)

A. Jayaraman G. A. Kourouklis L. G. Van Uitert

Fluorite

Isostructural

Diamond anvil cell

10.1007/bf02846696

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Citations (45)

Temperature-Induced Explosive First-Order Electronic Phase Transition in Gd-Doped SmS

Physical Review Letters (1973)

A. Jayaraman E. Bücher P. D. Dernier L. D. Longinotti

We have found a reversible temperature-induced explosive first-order electronic phase transition, with decreasing temperature at atmospheric pressure, in ${\mathrm{Sm}}_{1\ensuremath{-}x}{\mathrm{Gd}}_{x}\mathrm{S}$ for $0.16<~x<0.22$. The shiny golden-yellow metallic crystal disintegrates to a black powder. The transition is isostructural, but the unit cell expands from $a\ensuremath{\approx}5.68 \mathrm{to} 5.82$ \AA{}. The Sm ion in the black phase is characterized by an intermediate valence of \ensuremath{\sim}2.45. We present a phase diagram showing the stability regions in the $T\ensuremath{-}x$ plane and discuss a plausible driving mechanism for the transition.

Isostructural

10.1103/physrevlett.31.700

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Citations (95)

High-pressure Raman study ofCeO2to 35 GPa and pressure-induced phase transformation from the fluorite structure

Physical review. B, Condensed matter (1988)

G. A. Kourouklis A. Jayaraman G. P. Espinosa

Cerium dioxide (${\mathrm{CeO}}_{2}$), which crystallizes in the fluorite structure, has been studied by high-pressure Raman spectroscopy with use of a diamond anvil cell, up to 35 GPa. The pressure shift of the first-order fluorite Raman peak (${F}_{2g}$) and the shifts of several second-order features were measured. The Gr\"uneisen parameter for the ${F}_{2g}$ mode (465 ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$) is obtained as \ensuremath{\gamma}=1.44 and for the ${F}_{1u}$ (${\ensuremath{\omega}}_{\mathrm{LO}=585}$ ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$) as \ensuremath{\gamma}=1.5; the latter from the 2${\ensuremath{\omega}}_{\mathrm{LO}}$ shift in the second-order spectrum. Near 31 GPa, a phase transition occurs and six new Raman peaks appear. By comparison with the high-pressure phases of alkaline-earth difluorides, the high-pressure phase is believed to be of the ${\mathrm{PbCl}}_{2}$-type structure. The high-pressure phase is found to be metastable over a 20-GPa interval, but completely reverses on releasing pressure.

Diamond anvil cell

Fluorite

Metastability

10.1103/physrevb.37.4250

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Citations (108)

A high pressure Raman study of 9-hydroxyphenalenone and pressure-induced phase transitions

The Journal of Chemical Physics (1987)

A. Jayaraman G. A. Kourouklis Robert C. Haddon

The pressure effect on 9-hydroxyphenalenone (9-HPLN) has been investigated using Raman scattering and optical absorption techniques in a diamond anvil cell up to 70 kbar hydrostatic pressure. A pressure-induced first-order phase transition occurs near 6 kbar and the Raman data shows that the transition is to the same phase that is obtained on cooling 9-HPLN below 255 K at ambient pressure. The phase boundary has a positive slope with dT/dP=7 K/kbar. The Raman data indicate that there may be another phase change near 50 kbar. A strong and sharp Raman frequency near 12 cm−1 is observed in all the phases up to the highest pressure investigated. The weak pressure dependence of this frequency and its presence up to the highest pressure suggests that it may be a molecular mode rather than an external mode frequency. The optical absorption associated with π–π* excitation exhibits a large red shift, as expected of an aromatic molecular crystal.

Diamond anvil cell

Hydrostatic pressure

Ambient pressure

Absorption edge

10.1063/1.453004

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Citations (3)

Pressure dependence of the Raman-active modes in Bi4Ti3O12

Materials Letters (1987)

G. A. Kourouklis A. Jayaraman L. G. Van Uitert

Monoclinic crystal system

Bismuth titanate

Diamond anvil cell

Bismuth

10.1016/0167-577x(87)90087-5

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Citations (19)

CCDC 281015: Experimental Crystal Structure Determination

The Cambridge Structural Database (2005)

A. Jayaraman V.M. Balasubramaniam Suresh Valiyaveettil

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

10.5517/cc9ff04

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Citations (0)

Resonant electron-phonon coupling in CeAl2

Journal of Magnetism and Magnetic Materials (1985)

G. Güntherodt E. Zirngiebl S. Blumenröder A. Jayaraman B. Batlogg

10.1016/0304-8853(85)90427-5

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Citations (13)

X-ray diffraction and Raman studies of the CuGeO3(III)–(IV) transformation under high pressures

Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy (2005)

Ming Li Shiv K. Sharma A. Jayaraman Y. Kobayashi Etsuko Suzuki

10.1016/j.saa.2005.02.024

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Citations (9)