Nonadiabatic Landau–Zener–Stückelberg–Majorana transitions, dynamics, and interference

Ivakhnenko, Oleh V.; Shevchenko, S. N.; Nori, Franco

doi:10.1016/j.physrep.2022.10.002

Cited by 95 publications

(59 citation statements)

References 601 publications

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“…1b, right). The spin-flip probability is given by the celebrated Landau-Zener expression [38][39][40][41][42][43], which in our case takes the form…”

Section: Resultsmentioning

confidence: 99%

Vibronic Effects on the Quantum Tunnelling of Magnetisation in Single-Molecule Magnets

Mattioni¹,

Staab²,

Blackmore³

et al. 2023

Preprint

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Single-molecule magnets are among the most promising platforms for achieving molecular-scale data storage and processing. Their magnetisation dynamics are determined by the interplay between electronic and vibrational degrees of freedom, which can couple coherently, leading to complex vibronic dynamics. Building on an ab initio description of the electronic and vibrational Hamiltonians, we formulate a non-perturbative vibronic model of the low-energy magnetic degrees of freedom in a single-molecule magnet, which we benchmark against field-dependent magnetisation measurements. Describing the low-temperature magnetism of the complex in terms of magnetic polarons, we are able to quantify the vibronic contribution to the quantum tunnelling of the magnetisation. Despite collectively enhancing magnetic relaxation, we observe that specific vibrations suppress quantum tunnelling by enhancing the magnetic axiality of the complex. Finally, we discuss how this observation might impact the current paradigm to chemical design of new high-performance single-molecule magnets, promoting vibrations to an active role rather than just regarding them as sources of noise and decoherence.

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“…1b, right). The spin-flip probability is given by the celebrated Landau-Zener expression [38][39][40][41][42][43], which in our case takes the form…”

Section: Resultsmentioning

confidence: 99%

Vibronic Effects on the Quantum Tunnelling of Magnetisation in Single-Molecule Magnets

Mattioni¹,

Staab²,

Blackmore³

et al. 2023

Preprint

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show abstract

“…Der Übergang zwischen Valenz‐ und Leitungsband, also Interband‐Dynamik, kann im Fall hoher Feldstärken auch jenseits einer resonanten Bandlücke stattfinden. Bei nichtresonanten Bandübergängen tunnelt ein Elektron in Landau‐Zener‐Übergängen innerhalb eines Bruchteils einer optischen Periode ins Leitungsband – oder auch reversibel zurück ins Valenzband [4, 5, 13]. Die Wahrscheinlichkeit für solch einen Tunnelübergang hängt von mehreren Parametern ab: Sie wächst einerseits mit der Feldstärke, andererseits mit der Periodendauer des Laserimpulses; je länger ein optischer Zyklus dauert, desto mehr Zeit bleibt dem Elektron, um vollständig zu tunneln.…”

Section: Lichtfeld‐kontrolle Von Elektronenunclassified

Elektronik auf Lichtfrequenzen

Boolakee

Hommelhoff

2023

Physik in unserer Zeit

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“…Using basis states | T + ⟩, | T 0 ⟩, | T – ⟩, and | S ⟩ associated with the triplet and singlet states, respectively, the system Hamiltonian for the magnetic field pointing along the perpendicular axis takes the form Ĥ ⊥ = ( lefttrue a m I − J b 0 0 b − J b a m I 0 b − a m I − J 0 0 a m I 0 J ) where a = A ∥ /2 and b = ω 0 / 2 ; a similar expression applies for the parallel orientation (see SI). The scenario encoded in these representation matrices resembles a Landau–Zener–Stückelberg–Majorana (LZSM) transition, − where the relevant states of the avoided crossing are | S ⟩ and | T 0 ⟩ that have a constant coupling via the hyperfine interaction for m I ≠ 0.…”

Section: Driven Model Of Magnetoreceptionmentioning

confidence: 99%

Driven Radical Motion Enhances Cryptochrome Magnetoreception: Toward Live Quantum Sensing

Smith

Chowdhury

Iona

et al. 2022

J. Phys. Chem. Lett.

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The mechanism underlying magnetoreception has long eluded explanation. A popular hypothesis attributes this sense to the quantum coherent spin dynamics and spin-selective recombination reactions of radical pairs in the protein cryptochrome. However, concerns about the validity of the hypothesis have been raised because unavoidable inter-radical interactions, such as the strong electron–electron dipolar coupling, appear to suppress its sensitivity. We demonstrate that sensitivity can be restored by driving the spin system through a modulation of the inter-radical distance. It is shown that this dynamical process markedly enhances geomagnetic field sensitivity in strongly coupled radical pairs via Landau–Zener–Stückelberg–Majorana transitions between singlet and triplet states. These findings suggest that a “live” harmonically driven magnetoreceptor can be more sensitive than its “dead” static counterpart.

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Nonadiabatic Landau–Zener–Stückelberg–Majorana transitions, dynamics, and interference

Cited by 95 publications

References 601 publications

Vibronic Effects on the Quantum Tunnelling of Magnetisation in Single-Molecule Magnets

Vibronic Effects on the Quantum Tunnelling of Magnetisation in Single-Molecule Magnets

Elektronik auf Lichtfrequenzen

Driven Radical Motion Enhances Cryptochrome Magnetoreception: Toward Live Quantum Sensing

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