The Landau–Zener–Stückelberg–Majorana transition in the T2 ≪ T1 limit
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Authors
Boucher, Michael C.
Sun, Peter
Keresztes, Ivan
Harrell, Lee E.
Marohn, John A.
Issue Date
2023-09
Type
journal-article
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Keywords
Landau–Zener–Stückelberg–Majorana transition , Bloch equations , Electron spin resonance , Saturation , Adiabatic rapid passage , Magnetic resonance force microscopy , Force-gradient detected magnetic resonance
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Abstract
Landau–Zener–Stückelberg–Majorana (LZSM) transitions occur between quantum states when parameters in the system’s Hamiltonian are varied continuously and rapidly. In magnetic resonance, losses in adiabatic rapid passage can be understood using the physics of LZSM transitions. Most treatments of LZSM transitions ignore the T2 dephasing of coherences, however. Motivated by ongoing work in magnetic resonance force microscopy, we employ the Bloch equations, coordinate transformation, and the Magnus expansion to derive expressions for the final magnetization following a rapid field sweep at fixed irradiation intensity that include T2 losses. Our derivation introduces an inversion-function, Fourier transform method for numerically evaluating highly oscillatory integrals. Expressions for the final magnetization are given for low and high irradiation intensity, valid in the T2≪T1 limit. Analytical results are compared to numerical simulations and nuclear magnetic resonance experiments. Our relatively straightforward calculation reproduces semiquantitatively the well known LZSM result in the T2→0 limit.
Description
Citation
Michael C. Boucher, Peter Sun, Ivan Keresztes, Lee E. Harrell, John A. Marohn, The Landau–Zener–Stückelberg–Majorana transition in the T2 ≪ T1 limit, Journal of Magnetic Resonance, Volume 354, 2023, 107523, ISSN 1090-7807, https://doi.org/10.1016/j.jmr.2023.107523.
Publisher
Elsevier BV
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PubMed ID
ISSN
1090-7807