Imaging the Ettingshausen effect and cryogenic thermoelectric cooling in a van der Waals semimetal
arXiv:2312.05850 · doi:10.1038/s41567-024-02417-z
Abstract
Attaining viable thermoelectric cooling at cryogenic temperatures is of major fundamental and technological interest for novel electronics and quantum materials applications. In-device temperature control can provide a more efficient and precise thermal environment management as compared to the conventional global cooling. Here we develop nanoscale cryogenic imaging of a magneto-thermoelectric effect and demonstrate absolute cooling and an ultrahigh Ettingshausen effect in exfoliated WTe2 Weyl semimetal flakes at liquid He temperatures. Application of a current and perpendicular magnetic field gives rise to cooling via generation of electron-hole pairs on one side of the sample and heating by their recombination at the opposite side. In contrast to bulk materials, the cooling process is found to be nonmonotonic in magnetic field and device size. The derived model of magneto-thermoelectricity in mesoscopic semimetal devices shows that the cooling efficiency and the induced temperature profiles are governed by the interplay between sample geometry, electron-hole recombination length, magnetic field, and flake and substrate heat conductivities. The findings open the way for direct integration of microscopic thermoelectric cooling and for temperature landscape engineering in novel van der Waals devices.
References in corpus (35)
- Van der Waals heterostructures
- Titanic Magnetoresistance in WTe2
- Hot Carrier-Assisted Intrinsic Photoresponse in Graphene
- Opportunities for mesoscopics in thermometry and refrigeration: Physics and applications
- Thermoelectric and Magnetothermoelectric Transport Measurements of Graphene
- Large and tunable photo-thermoelectric effect in single-layer MoS2
- Photo-Thermoelectric Effect at a Graphene Interface Junction
- Scanning nano-SQUID with single electron spin sensitivity
- The thermopower and Nernst Effect in graphene in a magnetic field
- Quantum oscillations, thermoelectric coefficients and the Fermi surface of semi-metallic WTe2
- Nanoscale thermal imaging of dissipation in quantum systems
- Enhanced Thermoelectric Power in Graphene: Violation of the Mott Relation By Inelastic Scattering
- High Thermoelectric Power Factor in Graphene/hBN Devices
- Micrometre-scale refrigerators
- Tuning Magnetotransport in a Compensated Semimetal at the Atomic Scale
- Self-aligned nanoscale SQUID on a tip
- Dirac dispersion generates large Nernst effect in Weyl semimetals
- Imaging resonant dissipation from individual atomic defects in graphene
- Enhanced Thermoelectric Power in Dual-Gated Bilayer Graphene
- Magnetoresistance in two-component systems
- Quantized Thermoelectric Hall Effect Induces Giant Power Factor in a Topological Semimetal
- Imaging work and dissipation in the quantum Hall state in graphene
- Thermoelectric Transport of Massive Dirac Fermions in Bilayer Graphene
- Large Nernst Power Factor over a Broad Temperature Range in Polycrystalline Weyl Semimetal NbP
- Long-range nontopological edge currents in charge-neutral graphene
- Colossal Nernst power factor in topological semimetal NbSb
- Direct electronic measurement of Peltier cooling and heating in graphene
- Magnetoresistance of compensated semimetals in confined geometries
- Interaction driven giant thermopower in magic-angle twisted bilayer graphene
- Photo-Nernst current in graphene
- Large Nernst effect and field enhanced transversal ZT in ZrTe5
- Emergence of broken-symmetry states at half-integer band fillings in twisted bilayer graphene
- Direct Mapping of Local Seebeck Coefficient in 2D Material Nanostructures via Scanning Thermal Gate Microscopy
- Sputtered MoRe SQUID-on-tip for high-field magnetic and thermal nanoimaging
- Synthesis of Ultra-Thin Superionic Cu2Se and New Aspects of the Low-Temperature Crystal Configurations