Video Experimental Relacionado
Updated: Aug 31, 2025
11:21
Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
Published on: March 30, 2017
7.6K
La universalidad de Kardar-Parisi-Zhang en un condensado polaritónico unidimensional
Quentin Fontaine1, Davide Squizzato2,3,4, Florent Baboux1,5
1Université Paris-Saclay, CNRS, Centre de Nanosciences et de Nanotechnologies (C2N), Palaiseau, France.
Nature
|August 24, 2022
Resumen
Los investigadores encontraron que la evolución de la fase en un condensado polaritónico disipativo impulsado sigue la dinámica de la ecuación de Kardar-Parisi-Zhang (KPZ). Esto demuestra comportamientos universales en sistemas cuánticos abiertos, vinculando la física de la materia condensada y la física estadística.
Área de la Ciencia:
- Física estadística
- Física de la materia condensada
- La óptica cuántica
Sus antecedentes:
- Los comportamientos universales se observan en diversos sistemas físicos, caracterizados por la escala de la ley de potencia en las correlaciones espacio-temporales.
- La ecuación Kardar-Parisi-Zhang (KPZ) describe la dinámica de los sistemas que exhiben tales comportamientos universales.
- El trabajo teórico sugiere que la dinámica KPZ también puede aplicarse a sistemas fuera de equilibrio con coherencia espontánea.
Objetivo del estudio:
- Verificar experimentalmente si la evolución de fase en un condensado polaritónico unidimensional conducido por disipación se adhiere a la clase de universalidad KPZ.
- Para explorar comportamientos universales en sistemas cuánticos abiertos.
Principales métodos:
- Medición directa de las leyes de escala de espacio-tiempo de Kardar-Parisi-Zhang (KPZ).
- Análisis teórico para identificar firmas adicionales de la universalidad de las KPZ.
- Realización experimental utilizando un condensado polaritónico unidimensional conducido por disipación.
Principales resultados:
- Se demostró experimentalmente que la evolución de fase del condensado polaritónico se encuentra dentro de la clase de universalidad KPZ.
- Las firmas clave de la universalidad de KPZ se identificaron a través de mediciones directas y análisis teórico.
- Demostró un vínculo directo entre las observaciones experimentales y el marco teórico de la ecuación KPZ.
Conclusiones:
- El estudio confirma experimentalmente que los condensados polaritónicos conducidos por disipación exhiben una dinámica regida por la ecuación KPZ.
- Destaca las diferencias fundamentales entre los sistemas de materia condensada fuera de equilibrio y de equilibrio.
- Establece un nuevo paradigma para investigar los fenómenos universales en sistemas cuánticos abiertos.
Videos de Conceptos Relacionados
03:06The Pauli Exclusion Principle
46.3K
The arrangement of electrons in the orbitals of an atom is called its electron configuration. We describe an electron configuration with a symbol that contains three pieces of information:
46.3K
01:29Potential Due to a Polarized Object
460
A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
460
01:10First Law: Particles in One-dimensional Equilibrium
7.0K
Newton's first law of motion states that a body at rest remains at rest, or if in motion, remains in motion at constant velocity, unless acted on by a net external force. It also states that there must be a cause for any change in velocity (a change in either magnitude or direction) to occur. This cause is a net external force. For example, consider what happens to an object sliding along a rough horizontal surface. The object quickly grinds to a halt, due to the net force of friction. If...
7.0K
01:31Dielectric Polarization in a Capacitor
4.9K
The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
4.9K
01:18First Law: Particles in Two-dimensional Equilibrium
5.2K
Recall that a particle in equilibrium is one for which the external forces are balanced. Static equilibrium involves objects at rest, and dynamic equilibrium involves objects in motion without acceleration; but it is important to remember that these conditions are relative. For instance, an object may be at rest when viewed from one frame of reference, but that same object would appear to be in motion when viewed by someone moving at a constant velocity.
Newton's first law tells us about...
Newton's first law tells us about...
5.2K
01:12Kinetic Theory of an Ideal Gas
3.6K
A mole is defined as the amount of any substance that contains as many molecules as there are atoms in exactly 12 grams of carbon-12. An Italian scientist Amedeo Avogadro (1776–1856) formed the hypothesis that equal volumes of gas at equal pressure and temperature contain equal numbers of molecules, independent of the type of gas. Later, the hypothesis was developed to form the SI unit for measuring the amount of any substance.
The number of molecules in one mole is called...
The number of molecules in one mole is called...
3.6K