Thermal properties of the superconductor-quantum Hall interfaces
arXiv:2406.00850 · doi:10.1103/PhysRevLett.134.066001
Abstract
An important route of engineering topological states and excitations is to combine superconductors (SC) with the quantum Hall (QH) effect, and over the past decade, significant progress has been made in this direction. While typical measurements of these states focus on electronic properties, little attention has been paid to the accompanying thermal responses. Here, we examine the thermal properties of the interface between a type-II superconducting electrodes and graphene in the QH regime. We use the thermal noise measurement to probe the local electron temperature of the biased interface. Surprisingly, the measured temperature raise indicates that the superconductor provides a significant thermal conductivity, which is linear in temperature. This suggests electronic heat transport and may be unexpected, because the number of the quasiparticles in the superconductor should be exponentially suppressed. Instead, we attribute the measured electronic heat conductivity to the overlap of the normal states in the vortex cores.
Lingfei Zhao, Trevyn F.Q. Larson and Zubair Iftikhar contributed equally to this work
References in corpus (21)
- Observation of half-integer thermal Hall conductance
- Quantum limit of heat flow across a single electronic channel
- Random-matrix theory of Majorana fermions and topological superconductors
- Heat Conduction in the Vortex State of NbSe_2: Evidence for Multi-Band Superconductivity
- Supercurrent in the quantum Hall regime
- Colloquium: Quantum heat transport in condensed matter systems
- Inducing Superconducting Correlation in Quantum Hall Edge States
- Heat Coulomb Blockade of One Ballistic Channel
- Interference of chiral Andreev edge states
- Andreev reflection in the fractional quantum Hall state
- Primary thermometry triad at 6 mK in mesoscopic circuits
- Full control of quantum Hall supercurrent in a side gated graphene Josephson junction
- Evidence for chiral supercurrent in quantum Hall Josephson junctions
- Induced superconducting correlations in the quantum anomalous Hall insulator
- Electronic Thermal Transport Measurement in Low-Dimensional Materials with Graphene Nonlocal Noise Thermometry
- Electron heating in metallic resistors at sub-Kelvin temperature
- Loss and decoherence at the quantum Hall - superconductor interface
- Quantized conductance with non-zero shot noise as a signature of Andreev edge state
- Thermal conductance of Nb thin films at sub-kelvin temperatures
- Heat-mode excitation in a proximity superconductor
- Thermal conductivity in a mixed state of a superconductor at low magnetic fields