Berlin 2024 – scientific programme

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O: Fachverband Oberflächenphysik

O 70: Poster: Spins on Surfaces & Surface Magnetism

O 70.15: Poster

Wednesday, March 20, 2024, 18:00–20:00, Poster C

Paramagnetic resonance of individual organic molecules driven by quantum spin torque — Stepan Kovarik¹, Richard Schlitz^1,2, Aishwarya Vishwakarma¹, •Dominic Ruckert¹, Pietro Gambardella¹, and Sebastian Stepanow¹ — ¹ETH Zürich, Zurich, Switzerland — ²Department of Physics, University of Konstanz, Germany

It is well-established that time-dependent electromagnetic fields can excite the spin states of a quantum system. In electron paramagnetic resonance (EPR), an oscillating magnetic field B₁ with RF frequency allows coherent control over the spin state of single atoms or molecules.

However, our research shows an alternative mechanism for initiating spin resonance on a single pentacene molecule locally probed in STM.

Here, the mechanism for driving spin resonance is mediated by spin-polarized transport through a locally probed single molecule on the surface. A spin-polarized current oscillating with RF frequency can drive the precession of the localized magnetic moment as theoretically predicted by Shakirov et al. [1]. This process provides a distinct and complementary perspective to the B₁-driven mechanism [2].

Our findings allow the current induced spin initialization of a single spin and thereby hold promise for advancements in molecular-scale electronics and spintronics

Keywords: Spin torque; paramagnetic resonance; STM; spin-polarized; electron transport