On-Chip Quantum Sensing of Kondo Spins in a High-Mobility Quasi-One-Dimensional Nanoconstriction

The precise nature of Kondo spins has remained enigmatic when extended to multiple spin impurities or, more intriguingly, when the localized spin itself may already be the consequence of many-body interactions in a presumably delocalized open nanoconstriction, such as a quantum point contact (QPC). It is experimentally challenging to distinguish the Kondo state from other coexisting many-body spin states in such a strongly correlated system. Here we lithographically define an all-on-chip electronic resonator (ER) and a QPC in a high-mobility GaAs/AlGaAs heterostructure transistor. Local Kondo screening of the QPC spin and nonlocal spin singlet across the ER-QPC integration is controllable in response to ER occupancy parity. We also show that the 0.7 anomaly, another strongly correlated state in QPCs, not only has a different physical origin but furthermore counteracts the Kondo spin singlet. These results demonstrate a noninvasive quantum method for sensing spontaneous magnetic impurities within an open nanoconstriction.

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Publication Details

Journal
Nano Letters
Published
2025-05-01
DOI
https://doi.org/10.1021/acs.nanolett.5c00560
Primary Topic
Quantum and electron transport phenomena
Type
article
Field-Weighted Citation Impact
0.00

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article

On-Chip Quantum Sensing of Kondo Spins in a High-Mobility Quasi-One-Dimensional Nanoconstriction

I. Farrer, Jun-Hao Chang, G. L. Creeth, Shun‐Tsung Lo et al.
Nano Letters
Quantum and electron transport phenomena
article

On-Chip Quantum Sensing of Kondo Spins in a High-Mobility Quasi-One-Dimensional Nanoconstriction

I. Farrer, Jun-Hao Chang, G. L. Creeth, Shun‐Tsung Lo, L. W. Smith, Chi‐Kuei Wang, Y. L. Hsieh, Chi‐Te Liang, D. A. Ritchie, Shih-Hsiang Chao, J. P. Griffiths, Tse‐Ming Chen, Mingwei Chen, Yi‐Cheng Wu, M. Pepper, Sheng-Chin Ho, G. A. C. Jones, Pei-Tzu Wu
article en

Abstract

The precise nature of Kondo spins has remained enigmatic when extended to multiple spin impurities or, more intriguingly, when the localized spin itself may already be the consequence of many-body interactions in a presumably delocalized open nanoconstriction, such as a quantum point contact (QPC). It is experimentally challenging to distinguish the Kondo state from other coexisting many-body spin states in such a strongly correlated system. Here we lithographically define an all-on-chip electronic resonator (ER) and a QPC in a high-mobility GaAs/AlGaAs heterostructure transistor. Local Kondo screening of the QPC spin and nonlocal spin singlet across the ER-QPC integration is controllable in response to ER occupancy parity. We also show that the 0.7 anomaly, another strongly correlated state in QPCs, not only has a different physical origin but furthermore counteracts the Kondo spin singlet. These results demonstrate a noninvasive quantum method for sensing spontaneous magnetic impurities within an open nanoconstriction.

Nano LettersVol. 25(19)
National Yang Ming Chiao Tung University (TW), National Taiwan University (TW), University of Cambridge (GB), University College London (GB), University of Sheffield (GB), National Cheng Kung University (TW)
Engineering and Physical Sciences Research Council
Affordable and clean energy
Openalex Percentile: Top 93%
Quantum and electron transport phenomena
DOIOpen Access PDFOpenAlex
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