Mark-- For some reason I have not received Axil's comments, however, the
definition of coherence needs to be clarified.
I have always thought that coherence means that a quantum system exists of
various matter with one quantum state and a single wave function. In a BEC
there is only only wave function that exists at a time. That batch of
matter--the BEC--acts like a single particle of matter. Its coupling is with
other wave functions (associated with other matter or EM fields) that overlap
and may or may not change its wave function. EM fields can be dynamic and
moving field like in a photon or static fields like that associated with a
group of static charges or coordinated moving charges.
The idea of a "strong pumping mechanism" IMO means that the effective coupling
happens when quantum state transitions (new wave functions) of the BEC change
rapidly.
Do these ideas differ from your concept.
Bob
----- Original Message -----
From: MarkI-ZeroPoint
To: vortex-l@eskimo.com
Sent: Monday, December 29, 2014 8:55 PM
Subject: [Vo]:Re: [Vo]:FYI: Strong light–matter coupling in two-dimensional
atomic crystals
Axil,
A few of your statements may not be entirely true, depending on the
prevailing conditions…
“Coherence in these half matter half light systems is a function on the
strength of the pumping mechanism.
Coherence can occur at any temperature as long as the incoming pumping
energy is strong enough.
When we have a BEC fed with incoming pumped nuclear energy, very high
temperatures can be reached.”
The coherence that I’m referring to, of any significant scale, is highly
unlikely in condensed matter above a few K. Inside a void in a crystal
lattice, is entirely a different thing. If you’re referring to a BEC inside a
void or microcavity, then I’m ok with the above statements…
Assume you already have a BEC consisting of 100 Cs atoms… all of their wave
functions are coherent.
Now introduce a single photon of heat. That photon will be absorbed by *only
a single atom*, thus, changing its wave function and vibrational amplitude.
It’s wave function is now somewhat discordant with the remaining 99 atoms.
From here, there are a couple of possibilities:
1) the single atom sheds a photon which is then absorbed by one of the other
99 atoms. This process can go on for however long until the photon gets shed
and exits the BEC entirely.
2) if the heat energy is enough, the wave function is so discordant that the
atom gets ejected from the BEC before it can shed the photon.
3) ?
The more coherence between a set of waves, the stronger the coupling between
them; the more discordant, the weaker the coupling.
-mark iverson
From: Axil Axil [mailto:janap...@gmail.com]
Sent: Monday, December 29, 2014 8:30 PM
To: vortex-l
Subject: [Vo]:Re: [Vo]:FYI: Strong light–matter coupling in two-dimensional
atomic crystals
Casimir forces in a Plasma: Possible Connections to Yukawa Potentials
http://arxiv.org/pdf/1409.1032v1.pdf
Because of the vacuum energy, a plasma of virtual electron positron pairs
exists in the space between two subatomic particles. Mesons form as excitons
in this plasma. This is where pions come from in the nucleus that bind protons
and neutrons together in a mutual pion mediated transmutation dance.
I suspect the same plasma formation happens in larger cavities and is a
direct result of the uncertainty principle in quantum mechanics,
Coherence in these half matter half light systems is a function on the
strength of the pumping mechanism. Coherence can occur at any temperature as
long as the incoming pumping energy is strong enough.
When we have a BEC feed with incoming pumped nuclear energy, very high
temperatures can be reached.
On Mon, Dec 29, 2014 at 10:53 PM, MarkI-ZeroPoint <zeropo...@charter.net>
wrote:
FYI:
Article being referenced is at the bottom, however, I wanted to toss
something out to The Collective first…
One of the things that caught my eye in the article is the ‘room temperature’
condition…
As we all know, atoms at room temp are vibrating like crazy since they
contain the equivalent of 273degC of energy above their lowest state. Thus,
‘coherent’ states in condensed matter above absolute zero is almost never seen.
The article’s experiment was done in material at room temp, so the observed
behavior is a bit of a surprise. Perhaps what they have not yet thought about
is that the ‘microcavities’ have no temperature, as I will explain below.
This ties in with a point I tried to explain to Dr. Storms, and although I
think he realizes my point had merit, he glossed right over it and went off on
a different tangent. This was in a vortex discussion about 9 to 12 months ago.
The point is this:
The ‘temperature’ inside a ‘void’ in a crystal lattice is most likely that of
the vacuum of space; i.e, absolute zero, or very close to it. Because,
temperature is nothing more than excess energy imparted to atoms from
neighboring atoms; atoms have temperature; space/vacuum does not. Without
atoms (physical matter), you have no temperature. In a lattice void, if it is
large enough (whatever that dimension is), there is NO ‘temperature’ inside
since the void contains no atoms. If an atom diffuses into that void, it
enters with whatever energy it had when it entered, so it has a temperature.
At this time, I have not heard any discussion as to whether the atoms which
make up the walls of the void shed IR photons which could get absorbed by an
atom in the void and increase its temperature, however, would that atom want to
immediately shed that photon to get back to its lowest energy level??? So
voids in crystals likely provide an ideal environment for the formation of BECs.
-mark iverson
ARTICLE BEING REFERENCED
Strong light–matter coupling in two-dimensional atomic crystals
http://www.nature.com/nphoton/journal/v9/n1/full/nphoton.2014.304.html
Abstract
“Two-dimensional atomic crystals of graphene, as well as transition-metal
dichalcogenides, have emerged as a class of materials that demonstrate strong
interaction with light. This interaction can be further controlled by embedding
such materials into optical microcavities. When the interaction rate is
engineered to be faster than dissipation from the light and matter entities,
one reaches the ‘strong coupling’ regime. This results in the formation of
half-light, half-matter bosonic quasiparticles called microcavity polaritons.
Here, we report evidence of strong light–matter coupling and the formation of
microcavity polaritons in a two-dimensional atomic crystal of molybdenum
disulphide (MoS2) embedded inside a dielectric microcavity at room temperature.
A Rabi splitting of 46 ± 3 meV is observed in angle-resolved reflectivity and
photoluminescence spectra due to coupling between the two-dimensional excitons
and the cavity photons. Realizing strong coupling at room temperature in
two-dimensional materials that offer a disorder-free potential landscape
provides an attractive route for the development of practical polaritonic
devices.”
