Regensburg 2019 – scientific programme

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MA: Fachverband Magnetismus

MA 26: Spin dynamics and transport

MA 26.13: Talk

Wednesday, April 3, 2019, 12:45–13:00, H37

Boolean and quantum nanologic from first principles — •Wolfgang Hübner, Dibyajyoti Dutta, Stefan Sold, and Georgios Lefkidis — Technische Universität Kaiserslautern and Research Center OPTIMAS, Kaiserslautern, Germany

After having established Ni₄ as a paradigm for the theoretical treatment of ultrafast spin dynamics on highly correlated magnetic nanostructures [1], we apply the state-of-the-art equation-of-motion coupled-cluster with single and double excitations (EOM-CCSD) method for the quantum chemical calculations of both Ni₄ and the synthesized Co₃Ni-EtOH [2]. Thus we can enrich our zoo of laser-triggered magnetic logic functionalities, for which we exploit the spin degree of freedom as the sole information carrier. This zoo includes the ERASE functionality (also necessitating breaking of the time reversal symmetry), as well as the Boolean OR, AND, and the universal CNOT gates.

Due to the high precision of EOM-CCSD, we can go beyond classical logic and consider not only the direction and localization of the spin but also its quantum nature. Thus we additionally find the which path interference effect, in which the phase of the spin reveals information about the exact path traveled in a laser-induced spin transfer process [3], and construct the universal √NOT quantum logic gate (analogue to the Hadamard gate). Last but not least we show that laser-induced spin transfer can also reach the actual CMOS length scale.

[1] W. Hübner et al., Phys. Rev. B 96, 184432 (2017)

[2] D. Dutta et al., Phys. Rev. B 97, 224404 (2018)

[3] D. Chaudhuri et al., Phys. Rev. B 96, 184413 (2017)