Quantum oscillations of nonlinear electrical transport in a topological Dirac semimetal

Quantum oscillations have long served as a powerful probe of fundamental electronic properties. Traditionally, such studies have been limited to linear electrical transport, where the signal remains unchanged under reversal of magnetic field polarity. This work presents the first experimental evidence of quantum oscillations in nonlinear transport, which instead show polarity-dependent responses and reveal key Fermi-surface features beyond the reach of linear-transport quantum-oscillation studies. Using α-Sn, a topological Dirac semimetal supporting both linear and nonlinear transport, we show that nonlinear-transport oscillations are highly sensitive to the Fermi contour’s geometry and spin texture, with distinct magnetic field and temperature dependencies. These findings establish nonlinear-transport quantum oscillations as a transformative tool for exploring Fermi-surface physics and open new avenues for uncovering exotic electronic states., , , # Data from: Quantum oscillations of nonlinear electrical transport in a topological Dirac semimetal

Dataset DOI: [10.5061/dryad.3r2280gvt](10.5061/dryad.3r2280gvt)

## Description of the data and file structure

All uploaded data files are named according to the corresponding figure numbers in the manuscript titled *“Quantum oscillations of nonlinear electrical transport in a topological Dirac semimetal.”* Complete experimental details and measurement protocols are provided in the main manuscript and/or in the Supplementary Materials section. We would be happy to answer any additional questions or provide further assistance if you contact the corresponding author via email.

### Files and variables

#### File: Figure_2a.xlsx

**Description:** This dataset contains the measured first-harmonic resistance (R~₁ω~) of a 5-nm α-Sn film as a function of magnetic field, along with the polynomial background used to isolate the oscillatory component. These data demonstrate quantum oscillations ...,