E(transverse optical)-mode properties in the LiTaO3: Nd crystal at room temperature

1995 ◽  
Vol 60 (3) ◽  
pp. 317-320 ◽  
Author(s):  
X. L. Wu ◽  
M. S. Zhang ◽  
Q. Chen ◽  
D. Feng
Keyword(s):  
Room Temperature ◽  
Transverse Optical ◽  
Optical Mode

E(transverse?optical)-mode properties in the LiTaO3:Nd crystal at room temperature

1995 ◽  
Vol 60 (3) ◽  
pp. 317-320
Author(s):  
X. Wu ◽  
M.-S. Zhang ◽  
Q. Chen ◽  
D. Feng
Keyword(s):  
Room Temperature ◽  
Transverse Optical ◽  
Optical Mode

Bose–Einstein Condensation of Exciton-Polaritons in Organic Microcavities

2020 ◽  
Vol 71 (1) ◽  
pp. 435-459 ◽  
Author(s):  
Jonathan Keeling ◽  
Stéphane Kéna-Cohen
Keyword(s):  
Room Temperature ◽  
Organic Molecules ◽  
Einstein Condensation ◽  
Electronic Excitations ◽  
Optical Mode ◽  
Optical Cavities ◽  
Bose Einstein Condensation ◽  
Exciton Polaritons ◽  
Basic Physics ◽  
Bose Einstein

Bose–Einstein condensation describes the macroscopic occupation of a single-particle mode: the condensate. This state can in principle be realized for any particles obeying Bose–Einstein statistics; this includes hybrid light-matter excitations known as polaritons. Some of the unique optoelectronic properties of organic molecules make them especially well suited for the realization of polariton condensates. Exciton-polaritons form in optical cavities when electronic excitations couple collectively to the optical mode supported by the cavity. These polaritons obey bosonic statistics at moderate densities, are stable at room temperature, and have been observed to form a condensed or lasing state. Understanding the optimal conditions for polariton condensation requires careful modeling of the complex photophysics of organic molecules. In this article, we introduce the basic physics of exciton-polaritons and condensation and review experiments demonstrating polariton condensation in molecular materials.

Pressure dependence of the transverse optical mode Grüneisen parameter of crystals

1995 ◽  
Vol 19 (4) ◽  
pp. 403-408 ◽  
Author(s):  
L. Tribe ◽  
R.M. Fracchia ◽  
J.A.O. Bruno ◽  
A. Batana
Keyword(s):  
Pressure Dependence ◽  
Transverse Optical ◽  
Grüneisen Parameter ◽  
Optical Mode ◽  
Gruneisen Parameter

Itinerant Vibrons and High-Temperature Superconductivity*

2000 ◽  
Vol 658 ◽  
Author(s):  
John B. Goodenough
Keyword(s):  
High Temperature ◽  
Room Temperature ◽  
High Temperature Superconductivity ◽  
Phase Segregation ◽  
Optical Mode ◽  
Temperature Changes ◽  
Critical Composition ◽  
Underdoped Region ◽  
Small Polarons ◽  
Electronic Behavior

ABSTRACTThe La2−xSrxCuO4 phase diagram is interpreted within the framework of a transition from localized to itinerant electronic behavior. In the underdoped region 0 < x < 0.1, holes in the x2 – y2 band are not small polarons; each occupies a mobile correlation bag of 5 to 6 copper centers at temperatures T > TF, a spinodal phase segregation into the parent antiferromagnetic phase and a polaron liquid is accomplished below TF by cooperative oxygen displacements. In the overdoped compositions > x > 0.25, holes are excluded from strong-correlation fluctuations within a Fermi liquid. In the intermediate range 0.1 < x < 0.25, the polaron liquid formed below room temperature changes character with increasing x and decreasing T. In the polaron liquid, mobile two-hole bags of four copper centers order with decreasing temperature into alternate CuO-Cu rows of a superconductive CuO2 sheet at a critical composition xc ≍ 1/6. It is argued that hybridization of itinerant electrons with optical-mode phonons propagating along the Cu-O-Cu rows produces heavy electrons responsible for high-temperature superconductivity.

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