Two-level system coupled to phonons: Full analytical solution

We propose an analytical procedure to fully solve a two-level system coupled to phonons. Instead of using the common formulation in terms of linear and quadratic system-phonon couplings, we introduce different phonons depending on the system electronic level. We use this approach to recover known re...

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Veröffentlicht in:Physical review. B 2019-01, Vol.99 (1), p.1-382, Article 014302
Hauptverfasser: Chenu, Aurélia, Shiau, Shiue-Yuan, Combescot, Monique
Format: Artikel
Sprache:eng
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Zusammenfassung:We propose an analytical procedure to fully solve a two-level system coupled to phonons. Instead of using the common formulation in terms of linear and quadratic system-phonon couplings, we introduce different phonons depending on the system electronic level. We use this approach to recover known results for the linear-coupling limit in a simple way. More importantly, we derive results for the quadratic coupling induced by a phonon frequency change, a problem considered up to now as not analytically solvable.
ISSN:2469-9950
1098-0121
2469-9969
1550-235X
DOI:10.1103/PhysRevB.99.014302