Prof. J. C. Seamus Davis: Publications

Imaging the energy gap modulations of the cuprate pair-density-wave state

Nature Springer Nature 580:7801 (2020) 65-70

Authors:

Zengyi Du, Hui Li, Sang Hyun Joo, Elizabeth P Donoway, Jinho Lee, JC Séamus Davis, Genda Gu, Peter D Johnson, Kazuhiro Fujita

Momentum-resolved superconducting energy gaps of Sr2RuO4 from quasiparticle interference imaging

Proceedings of the National Academy of Sciences of the United States of America Proceedings of the National Academy of Sciences 117:10 (2020) 5222-5227

Authors:

Rahul Sharma, Stephen D Edkins, Zhenyu Wang, Andrey Kostin, Chanchal Sow, Yoshiteru Maeno, Andrew P Mackenzie, JC Séamus Davis, Vidya Madhavan

The Physics of Pair-Density Waves: Cuprate Superconductors and Beyond

Annual Review of Condensed Matter Physics Annual Reviews 11:1 (2020) 231-270

Authors:

Daniel F Agterberg, JC Séamus Davis, Stephen D Edkins, Eduardo Fradkin, Dale J Van Harlingen, Steven A Kivelson, Patrick A Lee, Leo Radzihovsky, John M Tranquada, Yuxuan Wang

Fractionalized pair density wave in the pseudogap phase of cuprate superconductors

Physical Review B American Physical Society (APS) 100:22 (2019) 224511

Authors:

D Chakraborty, M Grandadam, MH Hamidian, JCS Davis, Y Sidis, C Pépin

Magnetic monopole noise

Nature Springer Nature 571:7764 (2019) 234-239

Authors:

R Dusad, Franziska Kirschner, JC Hoke, BR Roberts, A Eyal, F Flicker, GM Luke, Stephen Blundell, James Davis

Abstract:

Magnetic monopoles1-3 are hypothetical elementary particles with quantized magnetic charge. In principle, a magnetic monopole can be detected by the quantized jump in magnetic flux that it generates upon passage through a superconducting quantum interference device (SQUID)4. Following the theoretical prediction that emergent magnetic monopoles should exist in several lanthanide pyrochlore magnetic insulators5,6, including Dy2Ti2O7, the SQUID technique has been proposed for their direct detection6. However, this approach has been hindered by the high number density and the generation-recombination fluctuations expected of such thermally generated monopoles. Recently, theoretical advances have enabled the prediction of the spectral density of magnetic-flux noise from monopole generation-recombination fluctuations in these materials7,8. Here we report the development of a SQUID-based flux noise spectrometer and measurements of the frequency and temperature dependence of magnetic-flux noise generated by Dy2Ti2O7 crystals. We detect almost all of the features of magnetic-flux noise predicted for magnetic monopole plasmas7,8, including the existence of intense magnetization noise and its characteristic frequency and temperature dependence. Moreover, comparisons of simulated and measured correlation functions of the magnetic-flux noise indicate that the motions of magnetic charges are strongly correlated. Intriguingly, because the generation-recombination time constant for Dy2Ti2O7 is in the millisecond range, magnetic monopole flux noise amplified by SQUID is audible to humans.

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