Video Experimental Relacionado
Updated: Jun 16, 2025
05:39
Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
Published on: August 2, 2019
9.6K
Brecha anormal del estado normal en un cuprato dopado con electrones
Ke-Jun Xu1,2,3, Junfeng He1,2,4, Su-Di Chen1,2,3,5
1Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA.
Science (New York, N.Y.)
|August 15, 2024
Resumen
Los investigadores descubrieron una nueva brecha de energía en los cupratos sub-dopados, lo que sugiere que el emparejamiento de Cooper puede permitir temperaturas de transición superconductoras más altas, que compiten con las de los cupratos de tipo p.
Área de la Ciencia:
- Física de la materia condensada
- Ciencias de los materiales
- Los materiales cuánticos
Sus antecedentes:
- Los cupratos de tipo N como Nd2-xCexCuO4 exhiben un comportamiento electrónico complejo.
- El orden antiferromagnético influye significativamente en la superficie de Fermi en estos materiales.
- Comprender las propiedades del estado normal es crucial para avanzar en la superconductividad.
Objetivo del estudio:
- Investigar el origen de la brecha energética anómala en los cupratos de tipo n con subdopaje.
- Determine la relación entre esta brecha y la superconductividad.
- Explorar el potencial de temperaturas de transición más altas en cupratos de tipo n.
Principales métodos:
- Se empleó la espectroscopia de fotoemisión con resolución de ángulo (ARPES).
- Análisis de la reconstrucción de la superficie de Fermi debido al antiferromagnetismo.
- Comparación de la brecha de energía observada con las brechas magnéticas y superconductoras conocidas.
Principales resultados:
- Se observó una brecha de energía anómala, significativamente más pequeña que la brecha antiferromagnética.
- Esta brecha abarca una amplia gama del régimen de subdopaje.
- La brecha se conecta suavemente a la brecha superconductora en el dopaje óptimo.
Conclusiones:
- La brecha del estado normal en los cupratos de tipo n con subdopaje probablemente surja del emparejamiento de Cooper.
- La alta escala de energía de esta brecha sugiere el potencial de superconductividad a alta temperatura.
- Este hallazgo abre caminos para la ingeniería de temperaturas de transición más altas en cupratos de tipo n.
Videos de Conceptos Relacionados
02:35Band Theory
15.0K
When two or more atoms come together to form a molecule, their atomic orbitals combine and molecular orbitals of distinct energies result. In a solid, there are a large number of atoms, and therefore a large number of atomic orbitals that may be combined into molecular orbitals. These groups of molecular orbitals are so closely placed together to form continuous regions of energies, known as the bands.
The energy difference between these bands is known as the band gap.
Conductor, Semiconductor,...
The energy difference between these bands is known as the band gap.
Conductor, Semiconductor,...
15.0K
01:20Types of Semiconductors
573
Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
573
01:11P-N junction
499
A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
499
01:24Metal-Semiconductor Junctions
319
The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
319
03:02Colors and Magnetism
11.6K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
11.6K
01:25MOS Capacitor
741
A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
741