Timeline for The Hund's J - Why can this be quantified?
Current License: CC BY-SA 4.0
7 events
| when toggle format | what | by | license | comment | |
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| Dec 31, 2020 at 4:24 | comment | added | Nike Dattani | Sorry, in the last comment I meant these unanswered questions: mattermodeling.stackexchange.com/q/1548/5, mattermodeling.stackexchange.com/q/1678/5 | |
| Dec 31, 2020 at 4:12 | history | edited | Nike Dattani | CC BY-SA 4.0 | added 92 characters in body |
| Dec 31, 2020 at 4:10 | comment | added | Nike Dattani | As the number one user of our "model Hamiltonians" tag, I wonder if you might be able to answer this one? It's one of the oldest unanswered questions on our entire site! Also this answer is so good that it deserves a bounty, though I think my edit just now (adding the necessary numbering of the equations in case someone else wants to refer to them in their answer or journal publication) will bring you at least 50 points from all the users that joined since July who hadn't seen this yet :) | |
| Jul 3, 2020 at 16:25 | comment | added | Anyon | @livars98 Thank you. Actually, what people tend to call "direct exchange interaction" in materials is the inter-site version of $J_{m_1m_2}$ above, so the Hund's coupling and the direct exchange have essentially the same structure. From that perspective, calling $J$ an intra-site "direct exchange effect" is reasonable, although potentially confusing. However, note that the inter-site direct exchange also depends on the Coulomb force. You generally need some force/potential to induce a finite energy splitting between two otherwise degenerate states like these spin states. | |
| Jul 3, 2020 at 4:19 | comment | added | livars98 | Very well-written answer. Thank you.I just wanted to clarify one thing. You say that 'J' is a combined effect of Coulombic forces and Pauli's principle - this implies that my previous impression that 'J' is purely a direct exchange effect, is erroneous, right? | |
| Jul 3, 2020 at 4:15 | vote | accept | livars98 | ||
| Jun 30, 2020 at 21:26 | history | answered | Anyon | CC BY-SA 4.0 |