Fig. 1: Geometry of the Tb2Pc3 single-molecule transistor and its electronic structure.
From: Increasing the Hilbert space dimension using a single coupled molecular spin
a AFM coloured image of Tb2Pc3 SMM connected to a gold source and drain electrodes through tunnelling barriers, on top of Au/HfO2 gate (adapted from ref. 54). The experimental set-up allows us to control the gate potential VG and the source-drain potential VSD, while performing lock-in measurements through the latter. An enlarged picture of the Tb2Pc3 SMM is given in Supplementary Fig. 1. b Zeeman diagram of Tb2Pc3 SMM derived from Eq. (3) with the applied magnetic field \({{{{\boldsymbol{B}}}}}_{{{{\boldsymbol{\parallel }}}}}\) along the easy axis of the magnetisation the ferromagnetic and antiferromagnetic basic states are respectively represented in red and blue with separation of \(\Delta E\approx 400\) K from the first excited state. c Enlargement of the ground ferromagnetic state and the first excited state (antiferromagnetic) un red and blue, respectively. d Evolution of the energy gap \(\Delta_{m,m'}\) at the anti-crossing as a function of the coupling between the electronic spins of the two terbium ions. The red dashed line marks the \(\Delta_{m,m'} =0.6\) mK and the ferromagnetic coupling C = 92 mK, values employed for simulations (Supplementary Information).
