Bogoliubov quasiparticle
In condensed matter physics, a Bogoliubov quasiparticle[1] or bogolon[2] is a quasiparticle that occurs in superconductivity and superfluidity. They are present in BCS theory of superconductors and in Bose–Einstein (BEC) condensates. These quasiparticles are named after Nikolay Bogolyubov who studied the microscopic model of these systems. Theoretically, bogolons originate from a quadratic Hamiltonian that can be diagonalized through a Bogoliubov transformation.
Sometimes these quasiparticles are also called Majorana modes, in analogy with the equations for Majorana fermions.[3]
Superconductivity
[edit]Whereas superconductivity is characterized by the condensation of Cooper pairs into the same ground quantum state, bogolons are elementary excitations above the ground state,[4] which are superpositions (linear combinations) of the excitations of negatively charged electrons and positively charged electron holes, and are therefore neutral spin-½ fermions.[5] When a Cooper pair breaks, two bogolons form.[4]
When dealing with conventional superconductors, interference between bogolons is hard for a scanning tunneling microscope to see.[6]
Bose gases
[edit]In a weakly interacting Bose gas, the bogolons are resulting quasiparticles that have linear dispersion.[7]
Interaction
[edit]There is evidence that graphene can turn superconducting when interacting with a Bose-Einstein condensate.[2] This is possible through the interactiong between graphene electrons and bogolons of the condensate.[2]
References
[edit]- ^ Ronen, Yuval; Cohen, Yonatan; Kang, Jung-Hyun; Haim, Arbel; Rieder, Maria-Theresa; Heiblum, Moty; Mahalu, Diana; Shtrikman, Hadas (1 January 2016). "Charge of a quasiparticle in a superconductor". Proceedings of the National Academy of Sciences. 113 (7): 1743–1748. arXiv:1505.03147. Bibcode:2016PNAS..113.1743R. doi:10.1073/pnas.1515173113. ISSN 0027-8424. PMC 4763780. PMID 26831071.
- ^ a b c Dumé, Isabelle (2021-08-04). "'Bogolons' make graphene superconducting". Physics World. Retrieved 2025-06-26.
- ^ Beenakker, C. W. J. (2014-02-20). "Annihilation of Colliding Bogoliubov Quasiparticles Reveals their Majorana Nature". Physical Review Letters. 112 (7): 070604. arXiv:1312.2001. Bibcode:2014PhRvL.112g0604B. doi:10.1103/PhysRevLett.112.070604. hdl:1887/51769. ISSN 0031-9007. PMID 24579584. S2CID 28799019.
- ^ a b Zagoskin, Alexandre (2012-12-06). Quantum Theory of Many-Body Systems: Techniques and Applications. Springer Science & Business Media. ISBN 978-1-4612-0595-1.
- ^ Kivelson, S. A.; Rokhsar, D. S. (1 May 1990). "Bogoliubov quasiparticles, spinons, and spin-charge decoupling in superconductors". Physical Review B. 41 (16). American Physical Society (APS): 11693–11696. Bibcode:1990PhRvB..4111693K. doi:10.1103/physrevb.41.11693. ISSN 0163-1829. PMID 9993614.
- ^ Preuss, Paul. "Quasiparticles and more quasiparticles". Lawrence Berkeley Lab. Retrieved 6 March 2025.
- ^ Ko, Dogyun; Sun, Meng; Kovalev, Vadim; Savenko, Ivan (2023-04-19). "Bogolon-mediated light absorption in atomic condensates of different dimensionality". Scientific Reports. 13 (1): 6358. doi:10.1038/s41598-023-33091-5. ISSN 2045-2322.
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