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Related Concept Videos

Alkali Metals03:06

Alkali Metals

24.2K
Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
Table 1: Properties of the alkali metals
24.2K
Metallic Solids02:37

Metallic Solids

20.5K
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
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Bonding in Metals02:32

Bonding in Metals

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Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”. 
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Social Traps01:41

Social Traps

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Social traps are negative situations where people get caught in a direction or relationship that later proves to be unpleasant, with no easy way to back out of or avoid. The concept was orignally introduced by John Platt who applied psychology to Garrett Hardin's "Tragedy of the Commons", where in New England herd owners could let their cattle graze in the common ground. This situation seems like a good idea, but an individual could have an advantage. If they owned...
26.3K
Structures of Solids02:22

Structures of Solids

17.5K
Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
17.5K
Alkali Aggregate Reaction in Concrete01:26

Alkali Aggregate Reaction in Concrete

494
The alkali-aggregate reaction in concrete involves natural siliceous minerals in aggregates reacting with alkaline hydroxides derived from cement alkalis. This reaction forms an alkali-silica gel that absorbs water, swells, and increases in volume, which is confined by the surrounding cement paste, creating internal pressures that crack and disrupt the concrete. The extent of expansion and damage can be partly attributed to the alkali-silica reaction's osmotic hydraulic pressure and the...
494

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Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures
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Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures

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Magneto-optic trap using a reversible, solid-state alkali-metal source.

S Kang, K R Moore, J P McGilligan

    Optics Letters
    |June 15, 2019
    PubMed
    Summary
    This summary is machine-generated.

    Researchers developed a new, low-power method to create and remove alkali-atom vapor-cell magneto-optic traps (MOTs) using a solid-state source. This breakthrough enables fast, reversible trapping for portable cold-atom applications.

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    Area of Science:

    • Atomic, Molecular, and Optical Physics
    • Solid-State Physics
    • Quantum Technologies

    Background:

    • Magneto-optic traps (MOTs) are crucial for cold-atom experiments.
    • Existing alkali-atom sources can be slow, power-intensive, or non-reversible.
    • There is a need for efficient and portable atom sources for diverse applications.

    Purpose of the Study:

    • To demonstrate a novel, reversible, solid-state alkali-metal source for MOTs.
    • To achieve fast formation and depletion of MOTs with low power consumption.
    • To explore the potential for broader applications in cold-atom systems.

    Main Methods:

    • Utilized a reversible, solid-state alkali-metal source.
    • Applied polarized voltage to form and deplete the magneto-optic trap.
    • Employed low electrical power (∼100 mW).

    Main Results:

    • Achieved a trapped-atom number of 5×106.
    • Demonstrated MOT formation and depletion timescales of approximately 1 second.
    • Showcased a fast, reversible, and low-power trapping mechanism.

    Conclusions:

    • The developed solid-state alkali-atom source offers a significant advancement for cold-atom systems.
    • This technology is suitable for both tabletop and portable applications.
    • The core technology is adaptable to other alkali and alkaline-earth elements for various uses.