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- Quantum_spin_tunneling abstract "Quantum spin tunneling, or quantum tunneling of magnetization, is a physical phenomenon by which the quantum mechanical state that describes the collective magnetization of a nanomagnet is a linear superposition of two states with well defined and opposite magnetization. Classically, the magnetic anisotropy favors either of the two states with opposite magnetization, so that the system has two equivalent ground states.Because of the quantum spin tunneling, an energy splitting between the bonding and anti-bonding linear combination of states with opposite magnetization classical ground states arises, giving rise to a unique ground state separated by the first excited state by an energy difference known as quantum spin tunneling splitting. The quantum spin tunneling splitting also occurs for pairs of excited states with opposite magnetization.As a consequence of quantum spin tunneling, the magnetization of a system can switch between states with opposite magnetization that are separated by an energy barrier much larger than thermal energy. Thus, quantum spin tunneling provides a pathway to magnetization switching forbidden in classical physics.Whereas quantum spin tunneling shares some properties with quantum tunneling in other two level systems such as a single electron in a double quantum well or in a diatomic molecule, it is a multi-electron phenomena, since more than one electron is required to have magnetic anisotropy. The multi-electron character is also revealed by an important feature, absent in single-electron tunneling: zero field quantum spin tunneling splitting is only possible for integer spins, and is certainly absent for half-integer spins, as ensured by Kramers degeneracy theorem.Initially discussed in the context of magnetization dynamics of magnetic nanoparticles, the concept was known as macroscopic quantum tunneling, a term that highlights both the difference with single electron tunneling and connects this phenomenon with other macroscopic quantum phenomena. In this sense, the problem of quantum spin tunneling lies in the boundary between the quantum and classical descriptions of reality.".
- Quantum_spin_tunneling wikiPageID "48344629".
- Quantum_spin_tunneling wikiPageLength "11223".
- Quantum_spin_tunneling wikiPageOutDegree "11".
- Quantum_spin_tunneling wikiPageRevisionID "707786424".
- Quantum_spin_tunneling wikiPageWikiLink Category:Condensed_matter_physics.
- Quantum_spin_tunneling wikiPageWikiLink Category:Magnetism.
- Quantum_spin_tunneling wikiPageWikiLink Category:Quantum_mechanics.
- Quantum_spin_tunneling wikiPageWikiLink Conical_intersection.
- Quantum_spin_tunneling wikiPageWikiLink Kramers_theorem.
- Quantum_spin_tunneling wikiPageWikiLink Macroscopic_quantum_phenomena.
- Quantum_spin_tunneling wikiPageWikiLink Magnetic_nanoparticles.
- Quantum_spin_tunneling wikiPageWikiLink Nanomagnet.
- Quantum_spin_tunneling wikiPageWikiLink Phthalocyanine.
- Quantum_spin_tunneling wikiPageWikiLink Quantum_tunnelling.
- Quantum_spin_tunneling wikiPageWikiLink Two-state_quantum_system.
- Quantum_spin_tunneling wikiPageWikiLinkText "macroscopic spin tunnelling".
- Quantum_spin_tunneling subject Category:Condensed_matter_physics.
- Quantum_spin_tunneling subject Category:Magnetism.
- Quantum_spin_tunneling subject Category:Quantum_mechanics.
- Quantum_spin_tunneling hypernym Phenomenon.
- Quantum_spin_tunneling type Disease.
- Quantum_spin_tunneling comment "Quantum spin tunneling, or quantum tunneling of magnetization, is a physical phenomenon by which the quantum mechanical state that describes the collective magnetization of a nanomagnet is a linear superposition of two states with well defined and opposite magnetization.".
- Quantum_spin_tunneling label "Quantum spin tunneling".
- Quantum_spin_tunneling wasDerivedFrom Quantum_spin_tunneling?oldid=707786424.
- Quantum_spin_tunneling isPrimaryTopicOf Quantum_spin_tunneling.