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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 40
    More: Interesting, physics, quantum dots, Department of Physics, gallium arsenide, scientists, excitations, photovoltaics, crystalline structures  
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1442 clicks; posted to Geek » on 05 Mar 2014 at 4:32 PM (24 weeks ago)   |  Favorite    |   share:  Share on Twitter share via Email Share on Facebook   more»



40 Comments   (+0 »)
   
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2014-03-05 03:36:35 PM
Is he a point, or is he a speck?  When he's underwater does he get wet?  Or does the water get him instead?  Nobody knows.
 
2014-03-05 04:18:04 PM
I read that as 'nudity'.
I need to get out more.
 
2014-03-05 04:34:51 PM
Let me fix the headline: Zero dimensional physics investigate nullity, in what must be the best research grant ever as scientists have to deliver exactly
 
2014-03-05 04:45:09 PM
I have not posted in this thread.
 
2014-03-05 04:51:35 PM
.
 
2014-03-05 04:52:29 PM
It's a grant about nothing.

Sort of like Seinfeld but with more asymptotes.
 
2014-03-05 04:54:28 PM
Mr Owl, just how tiny COULD you make a violin to play for the taxpayers?
 
2014-03-05 04:58:38 PM
Nothing?  Absolutely nothing?  Stoooooped, you soooo stooooped.
 
2014-03-05 04:59:09 PM
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.
 
2014-03-05 05:02:19 PM
If these scientists can see farther than some, it is because they stand upon the shoulders of giants...

"Nothin' from nothin' leaves nothin'."

--William E. Preston, PhD and Fifth Beatle
 
2014-03-05 05:09:33 PM
The research also requires copious amounts of Lone Star.

wp.patheos.com.s3.amazonaws.com
 
2014-03-05 05:18:07 PM
Zero equals 98.7%. Zero must equal 100%.
 
2014-03-05 05:18:52 PM

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.


I don't have too much problem with the idea of something existing that eludes my capacity to visualize it, so the possibility of a zero-dimensional state doesn't bother me.  What I find confusing is investigation of variations in the size of a zero-dimensional item.  I suspect the real problem here might be the non-zero gap between actual science and science reporting.
 
2014-03-05 05:22:13 PM
You get nothing! Good day, sir!
 
2014-03-05 05:38:50 PM
Is division involved?
 
2014-03-05 05:40:07 PM

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 05:42:14 PM
What published findings on nullity might look like:

www.pprintz.com
 
2014-03-05 05:50:36 PM
Did someone say my name?
 
2014-03-05 05:52:59 PM

dittybopper: Is he a point, or is he a speck?  When he's underwater does he get wet?  Or does the water get him instead?  Nobody knows.


I do.
 
2014-03-05 05:54:06 PM

Stile4aly: You get nothing! Good day, sir!


Good day to you too!
 
2014-03-05 05:54:48 PM

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.


Mu.
 
2014-03-05 05:59:18 PM

Scrotastic Method: What published findings on nullity might look like:


Isn't there a rule on posting pics of other Farkers?
 
2014-03-05 06:11:55 PM
But what are the implications for 0-D printing?
 
2014-03-05 06:54:24 PM
Haha physicists/mathematicians, Category Theory beats you out by going into negative dimensions..

Classically a point has 0 dimensions, a line 1, a surface 2, etc.

In n-Category theory, an ordinary category is of dimension 1 (a 1-cat) and there are higher analogs (a n-cat).

From this perspective a set is a 0 dimensional category, while a truth-value has -1 dimensions, and the single universal cosmic background has -2 dimensions.

Maybe the numbering is off by 1 but the singular background still needs to be negative.
 
2014-03-05 07:07:29 PM

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?


Not a physicist but I'll take a crack at getting there stepwise.

Suppose you start with a regular cable carrying electric current. As you correctly observe, that cable is three dimensional, current-carrying electrons can move in all three dimensions, and as it turns out all of its electrical properties, such as its resistance, depend on all three dimensions (as well as some other physical things like the conductivity and purity of the material).

Now let's get creative. Imagine that you could somehow confine the electrical field, and therefore the electrical current, to only the surface layer of atoms of the conductor, and prevent them entering the interior. One practical way of doing this might be to create long carbon nanotubes: sheets of carbon, exactly one atom thick, joined edge to edge to make hollow tubes. Now the electrons can't move in the interior: they can only move up and down, and around the tube. As far as describing the behavior of the electrons -- which start to exhibit some interesting and nonintuitive properties, by the way -- is concerned, only two spatial numbers matter: the length of the tube and the circumference of the tube. For all mathematical and physical electrical purposes, this tube is two dimensional even though it still occupies three dimensional space, of course. (There are other ways to do this, by the way, but for me this is the simplest to visualize mechanically.)

Now imagine we could somehow repeat the trick (I won't attempt to explain how) so that the electrons can't move sideways either; they can only move up and down. Now your math -- and for all practical purposes, the electrons' reality -- is one dimensional: only the length of the nanowire matters.

Finally, you crank the handle one more time, so that the electron is confined to a dot. That's your zero dimensional state or "quantum dot"; and it turns out that the mathematics to describe it are not merely perfectly sensible, they actually match experiment, such as being able to precisely tune the energy of the dot.

Now, I should say that in every physical detail that matters, the description above is completely wrong; but it should give you a flavor of what's going on here.
 
2014-03-05 07:12:11 PM

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.


it's the difference between something that is 1 nanometer thick and something that is .999999... nanometers thick. that is one nullity, named after its discoverer Johann Ity.

if you stack an infinite amount of them on top of each other, you get something that is one nanometer thick (1/(1-.9999...)). do that four times, and it's 4 nanometers thick. the problem is that because a nullity has no dimensions, you aren't really sure which way they're stacked (uncertainty principle), which is why they are investigating ways to measure it
 
2014-03-05 07:22:52 PM
The best grant is the "climate change" grant. Make up any shiat in the world, and immediately have the full force of MSNBC and CBS to come up with talking heads to support you, no matter how wrong your predictions are going.

The northern hemisphere is frozen solid? See, global warming!!
 
2014-03-05 07:50:03 PM

SevenizGud: The best grant is the "climate change" grant. Make up any shiat in the world, and immediately have the full force of MSNBC and CBS to come up with talking heads to support you, no matter how wrong your predictions are going.

The northern hemisphere is frozen solid? See, global warming!!


See: record drought in CA and Australia. Troll.

czetie: 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?

PirateKing: 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?


Thank you guys, I have an idea of what you are trying to explain. I don't fully understand it, but now I get the larger concept.
 
2014-03-05 07:57:13 PM
NULL != 0
 
2014-03-05 07:57:55 PM

TheShavingofOccam123: If these scientists can see farther than some, it is because they stand upon the shoulders of giants...

"Nothin' from nothin' leaves nothin'."

--William E. Preston, PhD and Fifth Beatle


"You get nothing for nothin, if that's what you do"
--Axl Rose
 
2014-03-05 08:06:21 PM

SDRR: TheShavingofOccam123: If these scientists can see farther than some, it is because they stand upon the shoulders of giants...

"Nothin' from nothin' leaves nothin'."

--William E. Preston, PhD and Fifth Beatle

"You get nothing for nothin, if that's what you do"
--Axl Rose


"Nothing will come of nothing. Speak again!"
-- King Lear
 
2014-03-05 08:10:35 PM
As I stepped onto the Magtube, a thought struck me: can there be friction where there is no substance? And can substance be tricked into hiding from itself?
Dr. Gail Nimbala, Morgan Industries Researcher

And so we return again to the holy void. Some say this is simply our destiny, but I would have you remember always that the void EXISTS, just as surely as you or I. Is nothingness any less a miracle than substance?
Sister Miriam Godwinson
"We Must Dissent"
 
2014-03-05 09:50:31 PM
They get their money for nothing.
 
2014-03-05 09:54:39 PM

Valiente: I have not posted in this thread.


You will, Valiente, you will.
 
2014-03-05 10:04:59 PM
Is this the dimensionality of configuration space they're talking about?

//And their Higgs for free.
 
2014-03-05 10:46:42 PM

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.


A point
 
2014-03-05 11:00:46 PM

HairBolus: Haha physicists/mathematicians, Category Theory beats you out by going into negative dimensions..


imgs.xkcd.com

 
2014-03-05 11:57:08 PM

Scrotastic Method: What published findings on nullity might look like:

[www.pprintz.com image 400x237]


What, I have to read all of that?  Gimme a break already!
 
2014-03-06 08:10:41 AM

HairBolus: Haha physicists/mathematicians, Category Theory beats you out by going into negative dimensions..

Classically a point has 0 dimensions, a line 1, a surface 2, etc.

In n-Category theory, an ordinary category is of dimension 1 (a 1-cat) and there are higher analogs (a n-cat).

From this perspective a set is a 0 dimensional category, while a truth-value has -1 dimensions, and the single universal cosmic background has -2 dimensions.

Maybe the numbering is off by 1 but the singular background still needs to be negative.


Mm. Went to link. Can't tell if bullshiat.
 
2014-03-07 01:29:58 AM

HoozierDaddy: HairBolus: Haha physicists/mathematicians, Category Theory beats you out by going into negative dimensions..

Classically a point has 0 dimensions, a line 1, a surface 2, etc.

In n-Category theory, an ordinary category is of dimension 1 (a 1-cat) and there are higher analogs (a n-cat).

From this perspective a set is a 0 dimensional category, while a truth-value has -1 dimensions, and the single universal cosmic background has -2 dimensions.

Maybe the numbering is off by 1 but the singular background still needs to be negative.

Mm. Went to link. Can't tell if bullshiat.


Well it depends on on how much bullshiat you can accept. Category Theory is now main-stream cutting-edge mathematics as opposed to being described by the old guard as "abstract nonsense".  Putting n-categories into  a Mendelvian style table  needs a -2  dimensional entry to make the table work.

As the progress of science goes I am sure that some theory will supplant Category Theory and maybe negative dimensions will just evaporate. But unless you have contradictions the table is real for now as the best understanding.
 
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