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Communication Dans Un Congrès Année : 2023

Spintronic implementations of quantum information engines to harvest ambient thermal energy: experiment and theory

Résumé

As areas of frontier research in energy, mesoscopic quantum thermodynamics (QTD) offer on-chip (i.e. applicative) solutions to harvest thermal energy with fast (~10GHz) electronic engine strokes, but operate at very low temperature and below the classical Carnot limit[1]. Atomic QTD at room temperature (RT) can exceed the Carnot limit [2] if out-of-equilibrium quantum resources, such as coherent states and non-thermal baths, are involved, but utilize slower (~10MHz) engine strokes and require auxiliary equipment, i.e. remain model experiments. We propose a novel spintronic implementation of QTD that utilizes the generation and manipulation of electrical currents based on the electron spin[3]. Rather than implement classical thermodynamics (e.g. spin Seebeck across the MTJ’s interfaces[4], [5], or harvesting (artificial) RF power[6] from Wifi/GSM signals), we combine spintronics and quantum thermodynamics at an atomic/mesoscopic intersection to harvest thermal fluctuations as a natural source of energy. Our quantum engine implements THz spintronic interactions between fully spin-polarized interfaces and paramagnetic centers that, ultimately, rectify thermal fluctuations on the latter to produce a dc electrical current. I will present our first report[7] of a spintronic engine implementation using an industrially mature device platform: the MgO magnetic tunnel junction (MTJ) that, as a device class, is used in next-generation magnetic memories[3]. We have also studied an implementation using Co phthalocynanine molecules[8], and developped several analytical/computational models[9] that describe how to power such a quantum spintronic engine using either quantum vacuum fluctuations or a phonon bath. References [1] M. Josefsson et al., “A quantum-dot heat engine operating close to the thermodynamic efficiency limits,” Nat. Nanotechnol. 13, 920 (2018). [2] J. Klatzow et al., “Experimental Demonstration of Quantum Effects in the Operation of Microscopic Heat Engines,” Phys. Rev. Lett., 122, 110601 (2019). [3] S. Bhatti, et al. “Spintronics based random access memory: a review,” Materials Today, 20, 530 (2017). [4] A. Boehnke et al., “Large magneto-Seebeck effect in magnetic tunnel junctions with half-metallic Heusler electrodes,” Nat. Commun., 8, 1626 (2017). [5] S. Tu et al., “Record thermopower found in an IrMn-based spintronic stack,” Nat Commun, 11, (2020). [6] A. A. Tulapurkar et al., “Spin-torque diode effect in magnetic tunnel junctions,” Nature,438 339 (2005). [7] K. Katcko et al., “Spin-driven electrical power generation at room temperature,” Communications Physics 2, 116, (2019). [8] B. Chowrira et al., “Quantum Advantage in a Molecular Spintronic Engine that Harvests Thermal Fluctuation Energy,” Adv. Mater., 34 2206688, (2022). [9] M. Lamblin and M. Bowen, “The Quantum Measurement Spintronic Engine: Using Entanglement to Harvest Vacuum Fluctuations.”10.48550/arXiv.2304.13474.
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hal-04274822 , version 1 (08-11-2023)

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  • HAL Id : hal-04274822 , version 1

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Martin Bowen. Spintronic implementations of quantum information engines to harvest ambient thermal energy: experiment and theory. U. Miami Invited Talk, Oct 2023, Miami, United States. ⟨hal-04274822⟩

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