Under the title «At the crossroads of molecular spin studies and applications» an online special issue of the journal «Low Temperature Physics» was published, dedicated to the 30th anniversary of the discovery of the macroscopic quantum tunneling effect of magnetization in single-molecule magnets, which defined the possibilities of their quantum applications.
The results of an international team of leading experts presented in the issue contribute to the creation of a new roadmap for biomimetic design of qubits operable at nitrogen temperatures. A wide range of topics is considered, from controlling spin relaxation in a predictive "bottom-up" approach to creating quantum superposition states and entangled spin states, their initialization, stabilization, and quantum control driven by magnetic anisotropy phenomena. Also studied are architectures of composite spin carriers and their environment to support quantum coherence and efficient functioning. The following topics concern electron spin control and feedback at various stages of predictive modeling: Preparation of a multi-well spin-degenerate state and initialization by lifting degeneracy: Studies of relaxation at very low temperatures of new molecules based on rare-earth elements (A. B. Arauzo, J. Rubín, L. Badía-Romano, J. Luzón, F. Luis, E. Burzurí, and J. Bartolomé, Very low-temperature magnetic relaxation processes of “butterfly” {Fe3TbO2} molecules). Layered cadmium iodide crystals demonstrating the influence of planar anisotropy defects on luminescence and phototransport (M. Rudka and N. Tovstyuk, Peculiarities of charge transfer in layered crystals of cadmium iodides). Chiral graphene nanoribbons grown on a monolayer EuAu2 alloy on Au(111) substrate, demonstrating electron-doped charge state (D. Serrate, E. Peláez-Sifonte, F. López-Tejeira, L. Fernández, F. Romero-Lara, K. Vaxevani, and Frederick Schiller, Synthesis of chiral magnetic graphene nanoribbons on ferromagnetic EuAu2). Magnetotransport properties of Bi88.08Mn11.92 and Bi95.69Mn3.69Fe0.62 depending on different contents of magnetic α-BiMn phase (A. V. Terekhov, V. M. Yarovyi, Yu. A. Kolesnichenko, K. Rogacki, E. Lähderanta, E. V. Khristenko, and A. L. Solovjov, Specific features of the magnetic-field dependences of electrical resistivity in Bi–Mn solid solutions with low Mn content). Hybrid organic and inorganic materials including the tetrachloroferrate(III) anion to demonstrate the effect of substituent changes in quinolinium-based cations (F. Scé, C. Piquer, L. Falvello, I. de Pedro, and J. Campo, Magneto-structural studies in π···π stacking hybrid organic-inorganic compounds based on quinolinium cation and tetrachloroferrate(III) ions). Transition from dielectric to metallic and superconducting states under pressure (W. Pik, S. S. Saxena, and C. R. S. Haines, 10 years of pressure tuning the two-dimensional transition metal phosphorus trichalcogenides (MPX3): Review and outlook). Control: High-temperature superconductivity arising from a complex, disorder-prone landscape of cuprates (E. Yu. Beliayev, Y. K. Mishra, I. A. Chichibaba, I. G. Mirzoiev, V. A. Horielyi, and A. V. Terekhov, Emergent coherence and percolative transport at the edge of magnetism in low-doped ). Relativistic spin Hall effect in Al and Pt — a key factor in spintronics (Yu. N. Chiang and M. O. Dzyuba, Relativistic spin Hall effect in an external magnetic field in Al and Pt). Quantum Zeno effect (J. G. Esteve and F. Falceto, The Zeno effect in a quantum computer). Implementation: Hybrid superconducting biological molecular resonators and their interaction (C. del Rio, S. Roca-Jerat, P. Pakulski, J. L. García Palacios, M. C. Pallarés, J. Sesé, D. Pinkowicz, A. Lostao, D. Zueco, and F. Luis, Microwave transmission and dynamical response of three on-chip superconducting resonators coupled to the same molecular spin ensemble). Review of stable flavin semiquinone free radicals along with their electron exchange processes, including a proposal for designing singlet-triplet qubits with optical initialization (V. Sirenko and J. Bartolomé, Biomimetic engineering spin relaxation in flavin radical pairs for singlet–triplet qubits). Electronic structure and magnetic properties of the neutral semiquinone state in flavoproteins (I. García-Rubio, M. Martínez-Júlvez, M. Medina, and J. I. Martínez, Flavodoxin: A platform for characterizing the electronic structure and magnetic properties of the neutral semiquinone state in flavoproteins). Proposal for the development of an artificial brain (P. Mikheenko, Artificial quantum brain: A bold proposal).
We invite you to familiarize yourself with the publications of the special issue via the link.
Follow updates on the website of the American Institute of Physics (AIP).
Information provided by the B. I. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine