The experiments were carried out in a 3He-cooled low-temperature STM system (USM-1300S, Unisoku, Japan) operating at T = 360 mK under UHV conditions. Spectroscopic data were obtained by measuring the differential tunneling conductance (dI/dU) using a standard lock-in technique with a bias modulation voltage of 20 μVrms and a frequency of 841 Hz with opened feedback loop. The bias voltage was applied to the sample, and the tunneling current was measured through the tip using a commercially available controller (Nanonis, SPECS, Swiss).

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