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journal article·2025-10Open access

Observation of Magnetic Pseudogap Behavior in Phosphorus‐Doped Silicon

Suheon Lee, Sangeun Cho, Yongcheol Jo, Wonjun Lee, Jae Min Kim, Hong Gu Lee, Yugo Oshima, Taku Matsushita, Hiroki Ikegami, Jonas A. Krieger, Christoper Baines, Thomas J. Hicken, Hubertus Luetkens, Eundeok Mun, Jungseek Hwang, Hyunsik Im, Kwang‐Yong Choi

Advanced Science· Volume 12· Issue 39
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Source abstract

Abstract

Abstract The recent discovery of a Kondo condensate in phosphorus‐doped silicon (Si:P) presents its significant potential for achieving novel many‐body quantum states. Si:P exhibits Kondo condensation, characterized by an energy gap in the electronic density of states, while the precise nature of its magnetic state has yet to be determined. Here, we utilize electron and muon spin resonance (ESR and µ SR) techniques, optical spectroscopy, and specific heat measurements to unravel the magnetic ground state and spin dynamics of Si:P. Both optical and ESR spectroscopy reveal the onset of spin correlations below 150 K. Furthermore, the muon spin relaxation rate exhibits a power‐law increase, λ ZF ∼ T −0.26(5) , below T KC ≈ 0.2 K, indicating the emergence of critical spin fluctuations within the Kondo condensate state. Strikingly, the concomitant occurrence of a Bardeen‐Cooper‐Schrieffer‐like charge gap and power‐law magnetic fluctuations closely parallels the pseudogap phases observed in doped Mott insulators. These findings evince that the critical spin fluctuations of the Kondo condensate state act as a driving force for pseudogap formation within inhomogeneous Kondo clouds.
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Research context

OpenAlex topics: Semiconductor materials and interfaces · ZnO doping and properties · Semiconductor materials and devices

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Center for Artificial Low Dimensional Electronic Systems Institute for Basic Science Pohang 37673 Republic of Korea

Division of System Semiconductor Dongguk University Seoul 04620 Republic of Korea

Research Center for Dielectric and Advanced Matter Physics Pusan National University Busan 46241 Republic of Korea

Department of Physics Sungkyunkwan University Suwon 16419 Republic of Korea

Nuclear Spectroscopy Laboratory RIKEN Pioneering Research Institute Hirosawa 2‐1, Wako Saitama 351‐0198 Japan

Department of Physics Nagoya University Chikusa‐ku Nagoya 464‐8602 Japan

Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China

PSI Center for Neutron and muon Sciences CNM Villigen 5232 Switzerland

Department of Physics Simon Fraser University Burnaby British Columbia V5A 1S6 Canada

Funding

Institute for Basic Science · Ministry of Science and ICT, South Korea · Japan Society for the Promotion of Science · National Natural Science Foundation of China

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