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Universal quantized thermal conductance in graphene

Srivastav, Saurabh Kumar and Sahu, Manas Ranjan and Watanabe, K and Taniguchi, T and Banerjee, Sumilan and Das, Anindya (2019) Universal quantized thermal conductance in graphene. In: SCIENCE ADVANCES, 5 (7).

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Official URL: https://dx.doi.org/10.1126/sciadv.aaw5798


The universal quantization of thermal conductance provides information on a state's topological order. Recent measurements revealed that the observed value of thermal conductance of the 5/2 state is inconsistent with either Pfaftian or anti-Pfaftian model, motivating several theoretical articles. Analysis has been made complicated by the presence of counter-propagating edge channels arising from edge reconstruction, an inevitable consequence of separating the dopant layer from the GaAs quantum well and the resulting soft confining potential. Here, we measured thermal conductance in graphene with atomically sharp confining potential by using sensitive noise thermometry on hexagonal boron-nitride encapsulated graphene devices, gated by either SiO2/Si or graphite back gate. We find the quantization of thermal conductance within 5% accuracy for nu =1;4/3;2 and 6 plateaus, emphasizing the universality of flow of information. These graphene quantum Hall thermal transport measurements will allow new insight into exotic systems like even-denominator quantum Hall fractions in graphene.

Item Type: Journal Article
Additional Information: copyright for this article belongs to AMER ASSOC ADVANCEMENT SCIENCE
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 06 Sep 2019 10:03
Last Modified: 06 Sep 2019 10:03
URI: http://eprints.iisc.ac.in/id/eprint/63501

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