dorsal/arxiv
View SchemaA Foray into Quantum Dynamics
| Authors | Ross C. O'Connell |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0212092 |
| URL | https://arxiv.org/abs/quant-ph/0212092 |
Abstract
The dynamics of a quantum mechanical particle in a time-independent potential are found to contain many interesting phenomena. These are direct consequences of the (typical) existence of more than one time scale governing the problem. This gives rise to full revivals of initial wavepackets, fractional revivals (multiple wavepackets appearing at fractions of the revival time) and the striking quantum carpets. A variety of analytic techniques are used to consider the interference that gives rise to these phenomena while skirting calculations involving cross-terms. Novel results include a new theorem on the weighting coefficients $a_m$ that govern fractional revivals, a demonstration that $\Psi_{cl}$, the function that governs the distribution and features of these fractional revivals, really does behave classically, a treatment of the wavepacket dephasing in the infinite square well by means of the Poisson summation formula, and a correct analysis of the spatial distribution of intermode traces. Also, this work presents a coherent treatment of these phenomena, which before now did not exist.
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"abstract": "The dynamics of a quantum mechanical particle in a time-independent potential\nare found to contain many interesting phenomena. These are direct consequences\nof the (typical) existence of more than one time scale governing the problem.\nThis gives rise to full revivals of initial wavepackets, fractional revivals\n(multiple wavepackets appearing at fractions of the revival time) and the\nstriking quantum carpets. A variety of analytic techniques are used to consider\nthe interference that gives rise to these phenomena while skirting calculations\ninvolving cross-terms. Novel results include a new theorem on the weighting\ncoefficients $a_m$ that govern fractional revivals, a demonstration that\n$\\Psi_{cl}$, the function that governs the distribution and features of these\nfractional revivals, really does behave classically, a treatment of the\nwavepacket dephasing in the infinite square well by means of the Poisson\nsummation formula, and a correct analysis of the spatial distribution of\nintermode traces. Also, this work presents a coherent treatment of these\nphenomena, which before now did not exist.",
"arxiv_id": "quant-ph/0212092",
"authors": [
"Ross C. O\u0027Connell"
],
"categories": [
"quant-ph"
],
"title": "A Foray into Quantum Dynamics",
"url": "https://arxiv.org/abs/quant-ph/0212092"
},
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