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(Science Daily)   Zero dimensional physics investigate nullity, in what must be the best research grant ever as scientists have to deliver exactly zero   ( sciencedaily.com) divider line
    More: Interesting, physics, quantum dots, Department of Physics, gallium arsenide, scientists, excitations, photovoltaics, crystalline structures  
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1467 clicks; posted to Geek » on 05 Mar 2014 at 4:32 PM (4 years ago)   |   Favorite    |   share:  Share on Twitter share via Email Share on Facebook   more»

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2014-03-05 05:40:07 PM  
2 votes:

phimuskapsi: Can any physicist explain how something that exists can have no dimension? A one dimensional wire 4 nanometers thick? Doesn't that mean that because it has length and some kind of volume it's three dimensional by definition? 

I'm having a hard time dealing with the concepts here.

Not a physicist, but IIRC dimensionality here does not refer to spatial dimensions, at least not directly. A quantum 'well' and a quantum 'wire' are structures that can limit the possible states of an excited particle (or exciton usually) to a given number of degrees of freedom. A quantum well limits the different 'places' that the particle can be to a 2 dimensional zone, a quantum wire to a 1 dimensional line of possible places it could be when you look for it.

Remember that particles don't really have defined positions so much as the probability that when you look at a given area, you'll find it there. A 'zero' dimensional quantum dot is a place where they've really limited the particle to not being able to move much at all, which is the really interesting part, since it opens up a lot of options for very precise control over extremely tiny amounts of charge.

Q-dots are already being used in various applications, like QD-LED screens. Since the color of light is dependent on the wavelength of the photons, if you can precisely engineer the size of the q-dot, you can tune the photons it emits to any color you like, since only some wavelengths can fit in the available space.

This article seems more like the usual terrible science journalism from Science Daily. Someone just got all breathless when they heard 'zero dimension', not realizing that quantum dots have been around for years. This is just a smaller one than usual, using nanowires instead of crystallizing the dots out of chemical solutions.
2014-03-05 07:57:13 PM  
1 vote:
NULL != 0
2014-03-05 04:45:09 PM  
1 vote:
I have not posted in this thread.
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