How is there such a thing as Negative Temperature?
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There is no such thin as negative temperature/energy.We just take a measurement as standard limit and if the temperature/energy is below the standard limit it is represented in negative.For example:-standard limit of temperature is 0 degree Celsius(freezing point of water) but for scientific use we take kelvin(+273).
Negative temperature is a statistical mechanical concept - for more information see the book Física Molecular of Kikoin and Kikoin
ok so ive done a lil bit of research,
and it turns out that when there is an inversion layer (the electrons are more likely to be in the excited state ) this is called negative temperature. it kinda makes sense because heat will flow from the specie at negative temp.
It gets a bit confusing when you also have a high energy state (positive temp), because the high energy state will be receiving the heat flow form the negative temperature specie.
If a specie is in a negative temperature state it effectively has more energy that any positive state.
Without negative temperature , LASERs would not be possible