Chemical tuning of spin clock transitions in molecular monomers based on
nuclear spin-free Ni(II)
- URL: http://arxiv.org/abs/2103.03021v1
- Date: Thu, 4 Mar 2021 13:31:40 GMT
- Title: Chemical tuning of spin clock transitions in molecular monomers based on
nuclear spin-free Ni(II)
- Authors: Marcos Rub\'in-Osanz, Fran\c{c}ois Lambert, Feng Shao, Eric Rivi\`ere,
R\'egis Guillot, Nicolas Suaud, Nathalie Guih\'ery, David Zueco, Anne-Laure
Barra, Talal Mallah and Fernando Luis
- Abstract summary: We report the existence of a sizeable quantum tunnelling splitting between the two lowest electronic spin levels of mononuclear Ni complexes.
The level anti-crossing, or magnetic clock transition, associated with this gap has been directly monitored by heat capacity experiments.
The comparison of these results with those obtained for a Co derivative, for which tunnelling is forbidden by symmetry, shows that the clock transition leads to an effective suppression of intermolecular spin-spin interactions.
- Score: 52.259804540075514
- License: http://creativecommons.org/licenses/by-nc-nd/4.0/
- Abstract: We report the existence of a sizeable quantum tunnelling splitting between
the two lowest electronic spin levels of mononuclear Ni complexes. The level
anti-crossing, or magnetic clock transition, associated with this gap has been
directly monitored by heat capacity experiments. The comparison of these
results with those obtained for a Co derivative, for which tunnelling is
forbidden by symmetry, shows that the clock transition leads to an effective
suppression of intermolecular spin-spin interactions. In addition, we show that
the quantum tunnelling splitting admits a chemical tuning via the modification
of the ligand shell that determines the crystal field and the magnetic
anisotropy. These properties are crucial to realize model spin qubits that
combine the necessary resilience against decoherence, a proper interfacing with
other qubits and with the control circuitry and the ability to initialize them
by cooling.
Related papers
- Spin decoherence in VOPc@graphene nanoribbon complexes [5.691318972818067]
Carbon nanoribbon or nanographene qubit arrays can facilitate quantum-to-quantum transduction between light, charge, and spin.
We study spin decoherence due to coupling with a surrounding nuclear spin bath of an electronic molecular spin of a vanadyl phthalocyanine (VOPc) molecule integrated on an armchair-edged graphene nanoribbon (GNR)
We find that the decoherence time $T$ is anisotropic with respect to magnetic field orientation and determined only by nuclear spins on VOPc and GNR.
arXiv Detail & Related papers (2023-07-31T04:55:05Z) - First-order transitions in spin chains coupled to quantum baths [0.0]
We show that tailoring the dissipative environment allows to change the features of continuous quantum phase transitions.
We find that spin couplings to local quantum boson baths in the Ohmic regime can drive the transition from the second to the first order even for a low dissipation strength.
arXiv Detail & Related papers (2022-07-27T20:42:08Z) - Tuning long-range fermion-mediated interactions in cold-atom quantum
simulators [68.8204255655161]
Engineering long-range interactions in cold-atom quantum simulators can lead to exotic quantum many-body behavior.
Here, we propose several tuning knobs, accessible in current experimental platforms, that allow to further control the range and shape of the mediated interactions.
arXiv Detail & Related papers (2022-03-31T13:32:12Z) - Demonstration of electron-nuclear decoupling at a spin clock transition [54.088309058031705]
Clock transitions protect molecular spin qubits from magnetic noise.
linear coupling to nuclear degrees of freedom causes a modulation and decay of electronic coherence.
An absence of quantum information leakage to the nuclear bath provides opportunities to characterize other decoherence sources.
arXiv Detail & Related papers (2021-06-09T16:23:47Z) - Anisotropic electron-nuclear interactions in a rotating quantum spin
bath [55.41644538483948]
Spin-bath interactions are strongly anisotropic, and rapid physical rotation has long been used in solid-state nuclear magnetic resonance.
We show that the interaction between electron spins of nitrogen-vacancy centers and a bath of $13$C nuclear spins introduces decoherence into the system.
Our findings offer new insights into the use of physical rotation for quantum control with implications for quantum systems having motional and rotational degrees of freedom that are not fixed.
arXiv Detail & Related papers (2021-05-16T06:15:00Z) - Probing the coherence of solid-state qubits at avoided crossings [51.805457601192614]
We study the quantum dynamics of paramagnetic defects interacting with a nuclear spin bath at avoided crossings.
The proposed theoretical approach paves the way to designing the coherence properties of spin qubits from first principles.
arXiv Detail & Related papers (2020-10-21T15:37:59Z) - Dynamic modulation of phonon-assisted transitions in quantum defects in
monolayer transition-metal dichalcogenide semiconductors [0.0]
We study the effect of spin-orbit coupling on the electron-phonon interaction in a single chalcogen vacancy defect.
We find that spin-orbit tune the magnitude of the electron-phonon coupling in both optical and charge-state transitions of the defect.
arXiv Detail & Related papers (2020-07-28T18:00:00Z) - Quantum coherent spin-electric control in a molecular nanomagnet at
clock transitions [57.50861918173065]
Electrical control of spins at the nanoscale offers architectural advantages in spintronics.
Recent demonstrations of electric-field (E-field) sensitivities in molecular spin materials are tantalising.
E-field sensitivities reported so far are rather weak, prompting the question of how to design molecules with stronger spin-electric couplings.
arXiv Detail & Related papers (2020-05-03T09:27:31Z)
This list is automatically generated from the titles and abstracts of the papers in this site.
This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.