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Murzakhanov FF, Sadovnikova MA, Gracheva IN, Mamin GV, Baibekov EI, Mokhov EN. Exploring the properties of theVB-defect in hBN: optical spin polarization, Rabi oscillations, and coherent nuclei modulation. NANOTECHNOLOGY 2024; 35:155001. [PMID: 38154127 DOI: 10.1088/1361-6528/ad1940] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/08/2023] [Accepted: 12/27/2023] [Indexed: 12/30/2023]
Abstract
Optically active point defects in semiconductors have received great attention in the field of solid-state quantum technologies. Hexagonal boron nitride, with an ultra-wide band gapEg= 6 eV, containing a negatively charged boron vacancy (VB-) with unique spin, optical, and coherent properties presents a new two-dimensional platform for the implementation of quantum technologies. This work establishes the value ofVB-spin polarization under optical pumping withλext= 532 nm laser using high-frequency (νmw= 94 GHz) electron paramagnetic resonance (EPR) spectroscopy. In optimal conditions polarization was found to beP≈ 38.4%. Our study reveals that Rabi oscillations induced on polarized spin states persist for up to 30-40μs, which is nearly two orders of magnitude longer than what was previously reported. Analysis of the coherent electron-nuclear interaction through the observed electron spin echo envelope modulation made it possible to detect signals from remote nitrogen and boron nuclei, and to establish a corresponding quadrupole coupling constantCq= 180 kHz related to nuclear quadrupole moment of14N. These results have fundamental importance for understanding the spin properties of boron vacancy.
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Affiliation(s)
- Fadis F Murzakhanov
- Institute of Physics, Kazan Federal University, Kremlyovskaya 18, Kazan 420008, Russia
| | | | - Irina N Gracheva
- Institute of Physics, Kazan Federal University, Kremlyovskaya 18, Kazan 420008, Russia
| | - Georgy V Mamin
- Institute of Physics, Kazan Federal University, Kremlyovskaya 18, Kazan 420008, Russia
| | - Eduard I Baibekov
- Institute of Physics, Kazan Federal University, Kremlyovskaya 18, Kazan 420008, Russia
| | - Evgeniy N Mokhov
- Ioffe Institute, Polytekhnicheskaya, 26, St Petersburg 194021, Russia
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2
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Xiong YC, Wang JN, Wang PC, Zhou Y, Ma Y, Zhou WH, Tong R. Trapping integrated molecular devices via a local transport circulation. Phys Chem Chem Phys 2022; 24:5522-5528. [DOI: 10.1039/d1cp04813a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Interactions between quantum systems and their environments may always result in inevitable decoherence. Isolation of the quantum system from the undesired environment noise brings us a great challenge for an...
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3
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Tsukerblat B, Palii A, Clemente-Juan JM, Coronado E. Modelling the properties of magnetic clusters with complex structures: how symmetry can help us. INT REV PHYS CHEM 2020. [DOI: 10.1080/0144235x.2020.1764778] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Boris Tsukerblat
- Department of Chemistry, Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - Andrew Palii
- Institute of Problems of Chemical Physics, Chernogolovka, Russia
- Institute of Applied Physics, Academy of Sciences of Moldova, Chisinau, Moldova
| | | | - Eugenio Coronado
- Instituto de Ciencia Molecular, Universidad de Valencia Paterna, SpainIn memory of Professor Peter Day
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4
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Zaripov R, Vavilova E, Khairuzhdinov I, Salikhov K, Voronkova V, Abdulmalic MA, Meva FE, Weheabby S, Rüffer T, Büchner B, Kataev V. Tuning the spin coherence time of Cu(II)-(bis)oxamato and Cu(II)-(bis)oxamidato complexes by advanced ESR pulse protocols. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2017; 8:943-955. [PMID: 28546889 PMCID: PMC5433190 DOI: 10.3762/bjnano.8.96] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/31/2017] [Accepted: 03/29/2017] [Indexed: 06/07/2023]
Abstract
We have investigated with the pulsed ESR technique at X- and Q-band frequencies the coherence and relaxation of Cu spins S = 1/2 in single crystals of diamagnetically diluted mononuclear [n-Bu4N]2[Cu(opba)] (1%) in the host lattice of [n-Bu4N]2[Ni(opba)] (99%, opba = o-phenylenebis(oxamato)) and of diamagnetically diluted mononuclear [n-Bu4N]2[Cu(opbon-Pr2)] (1%) in the host lattice of [n-Bu4N]2[Ni(opbon-Pr2)] (99%, opbon-Pr2 = o-phenylenebis(N(propyl)oxamidato)). For that we have measured the electron spin dephasing time Tm at different temperatures with the two-pulse primary echo and with the special Carr-Purcell-Meiboom-Gill (CPMG) multiple microwave pulse sequence. Application of the CPMG protocol has led to a substantial increase of the spin coherence lifetime in both complexes as compared to the primary echo results. It shows the efficiency of the suppression of the electron spin decoherence channel in the studied complexes arising due to spectral diffusion induced by a random modulation of the hyperfine interaction with the nuclear spins. We argue that this method can be used as a test for the relevance of the spectral diffusion for the electron spin decoherence. Our results have revealed a prominent role of the opba4- and opbon-Pr24- ligands for the dephasing of the Cu spins. The presence of additional 14N nuclei and protons in [Cu(opbon-Pr2)]2- as compared to [Cu(opba)]2- yields significantly shorter Tm times. Such a detrimental effect of the opbon-Pr24- ligands has to be considered when discussing a potential application of the Cu(II)-(bis)oxamato and Cu(II)-(bis)oxamidato complexes as building blocks of more complex molecular structures in prototype spintronic devices. Furthermore, in our work we propose an improved CPMG pulse protocol that enables elimination of unwanted echoes that inevitably appear in the case of inhomogeneously broadened ESR spectra due to the selective excitation of electron spins.
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Affiliation(s)
- Ruslan Zaripov
- Kazan E. K. Zavoisky Physical -Technical Institute, Russian Academy of Sciences, 420029 Kazan, Russia
| | - Evgeniya Vavilova
- Kazan E. K. Zavoisky Physical -Technical Institute, Russian Academy of Sciences, 420029 Kazan, Russia
| | - Iskander Khairuzhdinov
- Kazan E. K. Zavoisky Physical -Technical Institute, Russian Academy of Sciences, 420029 Kazan, Russia
| | - Kev Salikhov
- Kazan E. K. Zavoisky Physical -Technical Institute, Russian Academy of Sciences, 420029 Kazan, Russia
| | - Violeta Voronkova
- Kazan E. K. Zavoisky Physical -Technical Institute, Russian Academy of Sciences, 420029 Kazan, Russia
| | - Mohammad A Abdulmalic
- Technische Universität Chemnitz, Fakultät für Naturwissenschaften, Institut für Chemie, Straße der Nationen 62, D-09111 Chemnitz, Germany
| | - Francois E Meva
- Department of Pharmaceutical Sciences, Faculty of Medicine and Pharmaceutical Sciences, University of Douala, BP 2701, Cameroon
| | - Saddam Weheabby
- Technische Universität Chemnitz, Fakultät für Naturwissenschaften, Institut für Chemie, Straße der Nationen 62, D-09111 Chemnitz, Germany
| | - Tobias Rüffer
- Technische Universität Chemnitz, Fakultät für Naturwissenschaften, Institut für Chemie, Straße der Nationen 62, D-09111 Chemnitz, Germany
| | - Bernd Büchner
- Leibniz Institute for Solid State and Materials Research IFW Dresden, D-01171 Dresden, Germany
- Institut für Festkörperphysik, Technische Universität Dresden, D-01062 Dresden, Germany
| | - Vladislav Kataev
- Leibniz Institute for Solid State and Materials Research IFW Dresden, D-01171 Dresden, Germany
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Pedersen KS, Ariciu AM, McAdams S, Weihe H, Bendix J, Tuna F, Piligkos S. Toward Molecular 4f Single-Ion Magnet Qubits. J Am Chem Soc 2016; 138:5801-4. [DOI: 10.1021/jacs.6b02702] [Citation(s) in RCA: 167] [Impact Index Per Article: 20.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Kasper S. Pedersen
- CNRS, CRPP, UPR 8641, F-33600 Pessac, France
- CNRS, ICMCB, UPR 9014, F-33600 Pessac, France
| | - Ana-Maria Ariciu
- School
of Chemistry and Photon Science Institute, The University of Manchester, Manchester M13 9PL, United Kingdom
| | - Simon McAdams
- School
of Chemistry and Photon Science Institute, The University of Manchester, Manchester M13 9PL, United Kingdom
| | - Høgni Weihe
- Department
of Chemistry, University of Copenhagen, DK-2100 Copenhagen, Denmark
| | - Jesper Bendix
- Department
of Chemistry, University of Copenhagen, DK-2100 Copenhagen, Denmark
| | - Floriana Tuna
- School
of Chemistry and Photon Science Institute, The University of Manchester, Manchester M13 9PL, United Kingdom
| | - Stergios Piligkos
- Department
of Chemistry, University of Copenhagen, DK-2100 Copenhagen, Denmark
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Cardona-Serra S, Escalera-Moreno L, Baldoví JJ, Gaita-Ariño A, Clemente-Juan JM, Coronado E. SIMPRE1.2: Considering the hyperfine and quadrupolar couplings and the nuclear spin bath decoherence. J Comput Chem 2016; 37:1238-44. [PMID: 26833799 DOI: 10.1002/jcc.24313] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2015] [Accepted: 01/07/2016] [Indexed: 01/16/2023]
Abstract
SIMPRE is a fortran77 code which uses an effective electrostatic model of point charges to predict the magnetic behavior of rare-earth-based mononuclear complexes. In this article, we present SIMPRE1.2, which now takes into account two further phenomena. First, SIMPRE now considers the hyperfine and quadrupolar interactions within the rare-earth ion, resulting in a more complete and realistic set of energy levels and wave functions. Second, and to widen SIMPRE's predictive capabilities regarding potential molecular spin qubits, it now includes a routine that calculates an upper-bound estimate of the decoherence time considering only the dipolar coupling between the electron spin and the surrounding nuclear spin bath. Additionally, SIMPRE now allows the user to introduce the crystal field parameters manually. Thus, we are able to demonstrate the new features using as examples (i) a Gd-based mononuclear complex known for its properties both as a single ion magnet and as a coherent qubit and (ii) an Er-based mononuclear complex. © 2016 Wiley Periodicals, Inc.
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Affiliation(s)
| | - Luis Escalera-Moreno
- Instituto De Ciencia Molecular (ICMol) Universidad De Valencia, C/Catedrático José Beltrán 2, Paterna, 46980, Spain
| | - José J Baldoví
- Instituto De Ciencia Molecular (ICMol) Universidad De Valencia, C/Catedrático José Beltrán 2, Paterna, 46980, Spain.,Institut De Chimie Moléculaire Et Des Matériaux D'orsay, CNRS, Université De Paris Sud 11, Orsay Cedex, 91405, France
| | - Alejandro Gaita-Ariño
- Instituto De Ciencia Molecular (ICMol) Universidad De Valencia, C/Catedrático José Beltrán 2, Paterna, 46980, Spain
| | - Juan M Clemente-Juan
- Instituto De Ciencia Molecular (ICMol) Universidad De Valencia, C/Catedrático José Beltrán 2, Paterna, 46980, Spain
| | - Eugenio Coronado
- Instituto De Ciencia Molecular (ICMol) Universidad De Valencia, C/Catedrático José Beltrán 2, Paterna, 46980, Spain
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Gaita-Ariño A, Prima-García H, Cardona-Serra S, Escalera-Moreno L, Rosaleny LE, Baldoví JJ. Coherence and organisation in lanthanoid complexes: from single ion magnets to spin qubits. Inorg Chem Front 2016. [DOI: 10.1039/c5qi00296f] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Molecular magnetism is reaching a degree of development that will allow for the rational design of sophisticated systems.
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Affiliation(s)
| | - Helena Prima-García
- Instituto de Ciencia Molecular (ICMol)
- Universidad de Valencia
- 46980 Paterna
- Spain
| | | | | | - Lorena E. Rosaleny
- Instituto de Ciencia Molecular (ICMol)
- Universidad de Valencia
- 46980 Paterna
- Spain
| | - José J. Baldoví
- Instituto de Ciencia Molecular (ICMol)
- Universidad de Valencia
- 46980 Paterna
- Spain
- Institut de Chimie Moléculaire et des Matériaux d'Orsay
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8
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Room temperature quantum coherence in a potential molecular qubit. Nat Commun 2014; 5:5304. [DOI: 10.1038/ncomms6304] [Citation(s) in RCA: 208] [Impact Index Per Article: 20.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2014] [Accepted: 09/18/2014] [Indexed: 12/24/2022] Open
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9
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Gómez-Coca S, Ruiz E. A density functional theory approach to the magnetic properties of a coupled single-molecule magnet (Mn7)2 complex — An entangled qubit pair candidate. CAN J CHEM 2013. [DOI: 10.1139/cjc-2012-0548] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The exchange coupling constants of a Mn14 complex constituted by two weakly coupled Mn7 moieties were calculated using two different density functional theory (DFT) approaches: the Perdew–Burke–Ernzerhof (PBE) functional with a numerical basis set and the hybrid Becke, three-parameter Lee–Yang–Parr (B3LYP) functional employed with a Gaussian basis set. The sign and relative strength of the exchange coupling constants calculated with both methods were consistent; as expected, the values calculated with the PBE functional were slightly overestimated, as corroborated by comparison with the experimental magnetic susceptibility curve. Both methods gave a ground spin configuration of S = 3/2 for the Mn7 moiety, which was weakly antiferromagnetically coupled with the other Mn7 fragment, leading to an S = 0 ground spin configuration for the entire Mn14 complex.
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Affiliation(s)
- Silvia Gómez-Coca
- Departament de Química Inorgànica and Institut de Recerca de Química Teòrica i Computacional, Universitat de Barcelona, Diagonal 647, 08028 Spain
| | - Eliseo Ruiz
- Departament de Química Inorgànica and Institut de Recerca de Química Teòrica i Computacional, Universitat de Barcelona, Diagonal 647, 08028 Spain
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Baldoví JJ, Cardona-Serra S, Clemente-Juan JM, Coronado E, Gaita-Ariño A, Prima-García H. Coherent manipulation of spin qubits based on polyoxometalates: the case of the single ion magnet [GdW30P5O110]14−. Chem Commun (Camb) 2013; 49:8922-4. [DOI: 10.1039/c3cc44838j] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Barbara B. Mesoscopic systems: classical irreversibility and quantum coherence. PHILOSOPHICAL TRANSACTIONS. SERIES A, MATHEMATICAL, PHYSICAL, AND ENGINEERING SCIENCES 2012; 370:4487-4516. [PMID: 22908339 DOI: 10.1098/rsta.2012.0218] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Mesoscopic physics is a sub-discipline of condensed-matter physics that focuses on the properties of solids in a size range intermediate between bulk matter and individual atoms. In particular, it is characteristic of a domain where a certain number of interacting objects can easily be tuned between classical and quantum regimes, thus enabling studies at the border of the two. In magnetism, such a tuning was first realized with large-spin magnetic molecules called single-molecule magnets (SMMs) with archetype Mn(12)-ac. In general, the mesoscopic scale can be relatively large (e.g. micrometre-sized superconducting circuits), but, in magnetism, it is much smaller and can reach the atomic scale with rare earth (RE) ions. In all cases, it is shown how quantum relaxation can drastically reduce classical irreversibility. Taking the example of mesoscopic spin systems, the origin of irreversibility is discussed on the basis of the Landau-Zener model. A classical counterpart of this model is described enabling, in particular, intuitive understanding of most aspects of quantum spin dynamics. The spin dynamics of mesoscopic spin systems (SMM or RE systems) becomes coherent if they are well isolated. The study of the damping of their Rabi oscillations gives access to most relevant decoherence mechanisms by different environmental baths, including the electromagnetic bath of microwave excitation. This type of decoherence, clearly seen with spin systems, is easily recovered in quantum simulations. It is also observed with other types of qubits such as a single spin in a quantum dot or a superconducting loop, despite the presence of other competitive decoherence mechanisms. As in the molecular magnet V(15), the leading decoherence terms of superconducting qubits seem to be associated with a non-Markovian channel in which short-living entanglements with distributions of two-level systems (nuclear spins, impurity spins and/or charges) leading to 1/f noise induce τ(1)-like relaxation of S(z) with dissipation to the bath of two-level systems with which they interact most. Finally, let us mention that these experiments on quantum oscillations are, most of the time, performed in the classical regime of Rabi oscillations, suggesting that decoherence mechanisms might also be treated classically.
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Affiliation(s)
- Bernard Barbara
- Institut Néel, CNRS, associé à l'Université J. Fourier, BP 166, 38042 Grenoble, France.
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