期刊
NATURE
卷 586, 期 7827, 页码 42-+出版社
NATURE RESEARCH
DOI: 10.1038/s41586-020-2752-4
关键词
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资金
- Samsung Science and Technology Foundation [SSTFBA1702-05]
- Ministry of Economy and Competitiveness of Spain through the Severo Ochoa programme for Centres of Excellence in RD [SE5-0522]
- Fundacio Privada Cellex
- Fundacio Privada Mir-Puig
- La Caixa Foundation
- Army Research Laboratory Institute for Soldier Nanotechnologies programme [W911NF-18-2-0048]
- US Army Research Laboratory [W911NF-17-1-0435]
- Elemental Strategy Initiative by MEXT, Japan [JPMXP0112101001]
- JSPS KAKENHI [JP20H00354]
- CREST, JST [JPMJCR15F3]
- US Army Research Office [W911NF-17-1-0574]
- Generalitat de Catalunya through the CERCA programme
- H2020 Programme [820378]
- National Research Foundation of Korea [4199990114237] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Sensitive microwave detectors are essential in radioastronomy(1), dark-matter axion searches(2)and superconducting quantum information science(3,4). The conventional strategy to obtain higher-sensitivity bolometry is the nanofabrication of ever smaller devices to augment the thermal response(5-7). However, it is difficult to obtain efficient photon coupling and to maintain the material properties in a device with a large surface-to-volume ratio owing to surface contamination. Here we present an ultimately thin bolometric sensor based on monolayer graphene. To utilize the minute electronic specific heat and thermal conductivity of graphene, we develop a superconductor-graphene-superconductor Josephson junction(8-13)bolometer embedded in a microwave resonator with a resonance frequency of 7.9 gigahertz and over 99 per cent coupling efficiency. The dependence of the Josephson switching current on the operating temperature, charge density, input power and frequency shows a noise-equivalent power of 7 x 10(-19) watts per square-root hertz, which corresponds to an energy resolution of a single 32-gigahertz photon(14), reaching the fundamental limit imposed by intrinsic thermal fluctuations at 0.19 kelvin. Our results establish that two-dimensional materials could enable the development of bolometers with the highest sensitivity allowed by the laws of thermodynamics.
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