Electronic Thermal Transport Measurement in Low-Dimensional Materials with Graphene Nonlocal Noise Thermometry
ORAL
Abstract
In low-dimensional systems, the combination of reduced dimensionality, strong interactions, and
topology has led to a growing number of many-body quantum phenomena. Thermal transport, which
is sensitive to all energy-carrying degrees of freedom, provides a discriminating probe of emergent
excitations in quantum materials and devices. However, thermal transport measurements in low
dimensions are dominated by the phonon contribution of the lattice, requiring an experimental
approach to isolate the electronic thermal conductance. Here, we show how the measurement of
nonlocal voltage fluctuations in a multiterminal device can reveal the electronic heat transported
across a mesoscopic, low-dimensional bridge. By using two-dimensional graphene as
a noise thermometer, we demonstrate quantitative electronic thermal conductance measurements of
graphene and carbon nanotubes up to 70 K, achieving a precision of ~1% of the thermal conductance
quantum at 5 K. Employing linear and nonlinear thermal transport, we observe signatures of long range
interaction-mediated energy transport in one-dimensional electron systems, in agreement with a
theoretical model. Our versatile nonlocal noise thermometry allows new experiments probing energy
transport in emergent states of matter and devices in low dimensions.
topology has led to a growing number of many-body quantum phenomena. Thermal transport, which
is sensitive to all energy-carrying degrees of freedom, provides a discriminating probe of emergent
excitations in quantum materials and devices. However, thermal transport measurements in low
dimensions are dominated by the phonon contribution of the lattice, requiring an experimental
approach to isolate the electronic thermal conductance. Here, we show how the measurement of
nonlocal voltage fluctuations in a multiterminal device can reveal the electronic heat transported
across a mesoscopic, low-dimensional bridge. By using two-dimensional graphene as
a noise thermometer, we demonstrate quantitative electronic thermal conductance measurements of
graphene and carbon nanotubes up to 70 K, achieving a precision of ~1% of the thermal conductance
quantum at 5 K. Employing linear and nonlinear thermal transport, we observe signatures of long range
interaction-mediated energy transport in one-dimensional electron systems, in agreement with a
theoretical model. Our versatile nonlocal noise thermometry allows new experiments probing energy
transport in emergent states of matter and devices in low dimensions.
–
Publication: Nature Nanotechnology (2021) (in press) DOI:10.1038/s41565-021-01015-x
Preprint: https://arxiv.org/abs/2101.01737
Presenters
-
Jonah Waissman
- Harvard University