dorsal/arxiv
View SchemaCoherent Mechanism of Robust Population Inversion
| Authors | Jiri Vala, Ronnie Kosloff |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0012062 |
| URL | https://arxiv.org/abs/quant-ph/0012062 |
| DOI | 10.1364/OE.8.000238 |
Abstract
A coherent mechanism of robust population inversion in atomic and molecular systems by a chirped field is presented. It is demonstrated that a field of sufficiently high chirp rate imposes a certain relative phase between a ground and excited state wavefunction of a two-level system. The value of the relative phase angle is thus restricted to be negative and close to 0 or $-\pi$ for positive and negative chirp, respectively. This explains the unidirectionality of the population transfer from the ground to the excited state. In a molecular system composed of a ground and excited potential energy surface the symmetry between the action of a pulse with a large positive and negative chirp is broken. The same framwork of the coherent mechanism can explain the symmetry breaking and the population inversion due to a positive chirped field.
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"abstract": "A coherent mechanism of robust population inversion in atomic and molecular\nsystems by a chirped field is presented. It is demonstrated that a field of\nsufficiently high chirp rate imposes a certain relative phase between a ground\nand excited state wavefunction of a two-level system. The value of the relative\nphase angle is thus restricted to be negative and close to 0 or $-\\pi$ for\npositive and negative chirp, respectively. This explains the unidirectionality\nof the population transfer from the ground to the excited state. In a molecular\nsystem composed of a ground and excited potential energy surface the symmetry\nbetween the action of a pulse with a large positive and negative chirp is\nbroken. The same framwork of the coherent mechanism can explain the symmetry\nbreaking and the population inversion due to a positive chirped field.",
"arxiv_id": "quant-ph/0012062",
"authors": [
"Jiri Vala",
"Ronnie Kosloff"
],
"categories": [
"quant-ph"
],
"doi": "10.1364/OE.8.000238",
"title": "Coherent Mechanism of Robust Population Inversion",
"url": "https://arxiv.org/abs/quant-ph/0012062"
},
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