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Fataftah MS, Bayliss SL, Laorenza DW, Wang X, Phelan BT, Wilson CB, Mintun PJ, Kovos BD, Wasielewski MR, Han S, Sherwin MS, Awschalom DD, Freedman DE. Trigonal Bipyramidal V 3+ Complex as an Optically Addressable Molecular Qubit Candidate. J Am Chem Soc 2020; 142:20400-20408. [PMID: 33210910 DOI: 10.1021/jacs.0c08986] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Synthetic chemistry enables a bottom-up approach to quantum information science, where atoms can be deterministically positioned in a quantum bit or qubit. Two key requirements to realize quantum technologies are qubit initialization and read-out. By imbuing molecular spins with optical initialization and readout mechanisms, analogous to solid-state defects, molecules could be integrated into existing quantum infrastructure. To mimic the electronic structure of optically addressable defect sites, we designed the spin-triplet, V3+ complex, (C6F5)3trenVCNtBu (1). We measured the static spin properties as well as the spin coherence time of 1 demonstrating coherent control of this spin qubit with a 240 GHz electron paramagnetic resonance spectrometer powered by a free electron laser. We found that 1 exhibited narrow, near-infrared photoluminescence (PL) from a spin-singlet excited state. Using variable magnetic field PL spectroscopy, we resolved emission into each of the ground-state spin sublevels, a crucial component for spin-selective optical initialization and readout. This work demonstrates that trigonally symmetric, heteroleptic V3+ complexes are candidates for optical spin addressability.
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Affiliation(s)
- Majed S Fataftah
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - Sam L Bayliss
- Pritzker School of Molecular Engineering, University of Chicago, Chicago, Illinois 60637, United States
| | - Daniel W Laorenza
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - Xiaoling Wang
- Institute for Terahertz Science and Technology, University of California, Santa Barbara, Santa Barbara, California 93106, United States
- Department of Physics, University of California, Santa Barbara, Santa Barbara, California 93106, United States
| | - Brian T Phelan
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
- The Institute for Sustainability and Energy at Northwestern, Northwestern University, Evanston, Illinois 60208, United States
| | - C Blake Wilson
- Institute for Terahertz Science and Technology, University of California, Santa Barbara, Santa Barbara, California 93106, United States
- Department of Physics, University of California, Santa Barbara, Santa Barbara, California 93106, United States
| | - Peter J Mintun
- Pritzker School of Molecular Engineering, University of Chicago, Chicago, Illinois 60637, United States
| | - Berk D Kovos
- Pritzker School of Molecular Engineering, University of Chicago, Chicago, Illinois 60637, United States
| | - Michael R Wasielewski
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
- The Institute for Sustainability and Energy at Northwestern, Northwestern University, Evanston, Illinois 60208, United States
| | - Songi Han
- Department of Chemical Engineering, University of California, Santa Barbara, Santa Barbara, California 93106, United States
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, Santa Barbara, California 93106, United States
- Institute for Terahertz Science and Technology, University of California, Santa Barbara, Santa Barbara, California 93106, United States
| | - Mark S Sherwin
- Institute for Terahertz Science and Technology, University of California, Santa Barbara, Santa Barbara, California 93106, United States
- Department of Physics, University of California, Santa Barbara, Santa Barbara, California 93106, United States
| | - David D Awschalom
- Pritzker School of Molecular Engineering, University of Chicago, Chicago, Illinois 60637, United States
- Department of Physics, University of Chicago, Chicago, Illinois 60637, United States
- Center for Molecular Engineering and Materials Science Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Danna E Freedman
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
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Wilson CB, Edwards DT, Clayton JA, Han S, Sherwin MS. Dressed Rabi Oscillation in a Crystalline Organic Radical. PHYSICAL REVIEW LETTERS 2020; 124:047201. [PMID: 32058731 DOI: 10.1103/physrevlett.124.047201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/16/2019] [Revised: 10/04/2019] [Indexed: 06/10/2023]
Abstract
Free electron laser-powered pulsed electron paramagnetic resonance experiments performed at 240 GHz/8.56 T on the crystalline organic radical 1,3-bisdiphenylene-2-phenylallyl reveal a tip-angle dependent resonant frequency. Frequency shifts as large as 11 MHz (45 ppm) are observed during a single Rabi oscillation. We attribute the frequency shifts to a "dressing" of the nutation by spin-spin interactions. A nonlinear semiclassical model which includes a temperature- and sample-geometry-dependent demagnetizing field reproduces experimental results. Because experiments are performed without a cavity, radiation damping, the most common nonlinear interaction in magnetic resonance, is negligible in our experiments.
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Affiliation(s)
- C Blake Wilson
- Department of Physics, University of California, Santa Barbara, Santa Barbara, California, USA
- Institute for Terahertz Science and Technology, University of California, Santa Barbara, Santa Barbara, California, USA
| | - Devin T Edwards
- Department of Physics, University of California, Santa Barbara, Santa Barbara, California, USA
- Institute for Terahertz Science and Technology, University of California, Santa Barbara, Santa Barbara, California, USA
| | - Jessica A Clayton
- Department of Physics, University of California, Santa Barbara, Santa Barbara, California, USA
- Institute for Terahertz Science and Technology, University of California, Santa Barbara, Santa Barbara, California, USA
| | - Songi Han
- Institute for Terahertz Science and Technology, University of California, Santa Barbara, Santa Barbara, California, USA
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, Santa Barbara, California, USA
| | - Mark S Sherwin
- Department of Physics, University of California, Santa Barbara, Santa Barbara, California, USA
- Institute for Terahertz Science and Technology, University of California, Santa Barbara, Santa Barbara, California, USA
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Maryasov AG, Bowman MK, Fedin MV, Veber SL. Theoretical Basis for Switching a Kramers Single Molecular Magnet by Circularly-Polarized Radiation. MATERIALS (BASEL, SWITZERLAND) 2019; 12:ma12233865. [PMID: 31771118 PMCID: PMC6926751 DOI: 10.3390/ma12233865] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/01/2019] [Revised: 11/19/2019] [Accepted: 11/20/2019] [Indexed: 06/10/2023]
Abstract
The d-group Kramers ions, having strong zero field splitting (ZFS) with axial symmetry and a negative D value for the ZFS Hamiltonian, are widely considered as candidates for use as single molecular magnets (SMMs). An important need is the means to switch the SMM between its states in a reasonably short and predictable period of time, which is generally not available. We propose an approach, Zeeman-far infrared (ZeFIR) double resonance, in which circularly polarized alternating magnetic fields in the far infrared (FIR) range induce selective magnetic dipole transitions between different Kramers doublets of the SMM and polarized microwave (mw) pulses transfer excitation inside the upper Kramers doublet. A combination of FIR and mw pulses allows unidirectional switching between +S and -S states of the ion. The proposed approach is considered for a model quartet system with total spin S = 3/2, which seems to be the most promising object for selective resonance manipulations of its states by circularly polarized radiation.
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Affiliation(s)
- Alexander G. Maryasov
- Voevodsky Institute of Chemical Kinetics and Combustion of the Siberian Branch of the Russian Academy of Sciences, 630090 Novosibirsk, Russia
| | - Michael K. Bowman
- Department of Chemistry & Biochemistry, The University of Alabama, Tuscaloosa, AL 35487, USA;
- Novosibirsk Institute of Organic Chemistry of the Siberian Branch of the Russian Academy of Sciences, 630090 Novosibirsk, Russia
| | - Matvey V. Fedin
- International Tomography Center of the Siberian Branch of the Russian Academy of Sciences, 630090 Novosibirsk, Russia;
- Department of Physics, Novosibirsk State University, 630090 Novosibirsk, Russia
| | - Sergey L. Veber
- International Tomography Center of the Siberian Branch of the Russian Academy of Sciences, 630090 Novosibirsk, Russia;
- Department of Physics, Novosibirsk State University, 630090 Novosibirsk, Russia
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