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This fact is known as spin-charge separation.
Spin-charge separation is one of the most unusual manifestations of the concept of quasiparticles.
In a two-component Bose gas in 1D, strong interactions can produce a maximal form of spin-charge separation.
This was then developed by Joaquin Mazdak Luttinger in 1963 with an exactly solvable model which demonstrated spin-charge separation.
Other examples include half charges in polyacetylene, spin-charge separation, and emergent magnetic monopoles in spin ice (which is well described by a classical statistical model).
Although Haldane treated spinless fermions, the extension to spin- fermions and associated spin-charge separation was clear so that the promised follow-up paper did not appear.
The theory of spin-charge separation originates with the work of Sin-Itiro Tomonaga who developed an approximate method for treating one-dimensional interacting quantum systems in 1950.
The key features of the findings are the presence in Herbertsmithite of spin-charge separation and SCQSL formed with itinerant spinons.
One difficulty of the spin-charge separation is that while spinon and chargon are not gauge-invariant quantities, i.e. unphysical objects, there are no direct physical probes to observe them.
In the case of spin-charge separation, for example, the electron can be viewed as a bound state of a 'spinon' and a 'chargon', which under certain conditions can become free to move separately.
Because of the spin-charge separation, heat transport, thermodynamic and relaxation properties at low temperatures of the SCI Herbertsmithite are similar to those of heavy-fermion metals rather than of insulators.
The reason we obtain radically different answers from these two formalisms is probably because of the wrong mean field solution we choose, which means that we are dealing with the spin-charge separation in a wrong way.
In condensed matter physics, spin-charge separation is an unusual behavior of electrons in some materials in which they 'split' into three independent particles, the spinon, orbiton and the chargon (or its antiparticle, the holon).
Orbitons are one of three quasiparticles, along with holons and spinons, that electrons in solids are able to split into during the process of spin-charge separation, when extremely tightly confined at temperatures close to absolute zero.
A team of researchers working at the Advanced Light Source (ALS) of the U.S. Department of Energy's Lawrence Berkeley National Laboratory also observed peak spectral structures of spin-charge separation around the same time.