why in case of Graphene and other 2D materials spin is called as psuedospin?
and how to we get other degree of freedom called valley degree of freedom?
Please give simple explanation! Thank you
because it refers to the sub-lattice degree of freedom, thus it is not a proper spin: it does not follow the same symmetries, for example is not inverted by time reversal. Nevertheless it has been suggested that it is related to angular momentum: Article Spin and the Honeycomb Lattice: Lessons from Graphene
because it refers to the sub-lattice degree of freedom, thus it is not a proper spin: it does not follow the same symmetries, for example is not inverted by time reversal. Nevertheless it has been suggested that it is related to angular momentum: Article Spin and the Honeycomb Lattice: Lessons from Graphene
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