Gate-dependent non-linear Hall effect at room temperature in topological semimetal GeTe

Abstract

We experimentally investigate non-linear Hall effect as zero-frequency and second-harmonic transverse voltage responses to ac electric current for topological semimetal GeTe. A thick single-crystal GeTe flake is placed on the Si/SiO${}_2$ substrate, where the p-doped Si layer serves as a gate electrode. We confirm, that electron concentration is not gate-sensitive in thick GeTe flakes due to the gate field screening by bulk carriers. In contrast, by transverse voltage measurements, we demonstrate that the non-linear Hall effect shows pronounced dependence on the gate electric field at room temperature. Since the non-linear Hall effect is a direct consequence of a Berry curvature dipole in topological media, our observations indicate that Berry curvature can be controlled by the gate electric field. This experimental observation can be understood as a result of the known dependence of giant Rashba splitting on the external electric field in GeTe. For possible applications, the zero-frequency gate-controlled non-linear Hall effect can be used for the efficient broad-band rectification.

References in corpus (12)

• Band signatures for strong nonlinear Hall effect in bilayer WTe${}_2$
• Giant $c$-axis nonlinear anomalous Hall effect in T${}_d$-MoTe${}_2$ and WTe${}_2$
• Strong Room-Temperature Bulk Nonlinear Hall Effect in a Spin-Valley Locked Dirac Material
• Control over Berry Curvature Dipole with Electric Field in WTe2
• Probing quantum criticality using nonlinear Hall effect in a metallic Dirac system
• Photocurrents in gyrotropic Weyl semimetals
• Enhanced Thermoelectric Properties of Dirac Semimetal Cd3As2
• Interface superconductivity in a type-II Dirac semimetal NiTe${}_2$
• Thermoelectric transport in two-dimensional topological insulator state based on HgTe quantum well
• Thermopower of a Two-Dimensional Semimetal in a HgTe Quantum Well
• Dynamic negative capacitance regime in GeTe Rashba ferroelectric
• Second-harmonic response as a tool to detect spin textures in magnetic nodal-line semimetal Fe${}_3$GeTe${}_2$

Cited by in corpus (6)

• Non-linear Hall Effects: Mechanisms and Materials
• Reentrant proximity-induced superconductivity for GeTe semimetal
• Electronic transport and Fermi surface of Weyl semimetal WTe2: quantum oscillations and first-principles study
• Spin-valve effect for spin-polarized surface states in topological semimetals
• Surface spin polarization in the magnetic response of GeTe Rashba ferroelectric
• Fermi surface and topology of multiband superconductor BeAu