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Time, momentum, and energy resolved pump-probe tunneling spectroscopy of two-dimensional electron systems

Author

Listed:
  • H. M. Yoo

    (Massachusetts Institute of Technology)

  • M. Korkusinski

    (National Research Council of Canada)

  • D. Miravet

    (University of Ottawa)

  • K. W. Baldwin

    (Princeton University)

  • K. West

    (Princeton University)

  • L. Pfeiffer

    (Princeton University)

  • P. Hawrylak

    (University of Ottawa)

  • R. C. Ashoori

    (Massachusetts Institute of Technology)

Abstract

Real-time probing of electrons can uncover intricate relaxation mechanisms and many-body interactions in strongly correlated materials. Here, we introduce time, momentum, and energy resolved pump-probe tunneling spectroscopy (Tr-MERTS). The method allows the injection of electrons at a particular energy and observation of their subsequent decay in energy-momentum space. Using Tr-MERTS, we visualize electronic decay processes, with lifetimes from tens of nanoseconds to tens of microseconds, in Landau levels formed in a GaAs quantum well. Although most observed features agree with simple energy-relaxation, we discovered a splitting in the nonequilibrium energy spectrum in the vicinity of a ferromagnetic state. An exact diagonalization study suggests that the splitting arises from a maximally spin-polarized state with higher energy than a conventional equilibrium skyrmion. Furthermore, we observe time-dependent relaxation of the splitting, which we attribute to single-flipped spins forming skyrmions. These results establish Tr-MERTS as a powerful tool for studying the properties of a 2DES beyond equilibrium.

Suggested Citation

  • H. M. Yoo & M. Korkusinski & D. Miravet & K. W. Baldwin & K. West & L. Pfeiffer & P. Hawrylak & R. C. Ashoori, 2023. "Time, momentum, and energy resolved pump-probe tunneling spectroscopy of two-dimensional electron systems," Nature Communications, Nature, vol. 14(1), pages 1-6, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-43268-1
    DOI: 10.1038/s41467-023-43268-1
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    References listed on IDEAS

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    1. Hope M. Bretscher & Paolo Andrich & Prachi Telang & Anupam Singh & Luminita Harnagea & A. K. Sood & Akshay Rao, 2021. "Ultrafast melting and recovery of collective order in the excitonic insulator Ta2NiSe5," Nature Communications, Nature, vol. 12(1), pages 1-8, December.
    2. O. E. Dial & R. C. Ashoori & L. N. Pfeiffer & K. W. West, 2007. "High-resolution spectroscopy of two-dimensional electron systems," Nature, Nature, vol. 448(7150), pages 176-179, July.
    3. O. E. Dial & R. C. Ashoori & L. N. Pfeiffer & K. W. West, 2010. "Anomalous structure in the single particle spectrum of the fractional quantum Hall effect," Nature, Nature, vol. 464(7288), pages 566-570, March.
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