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Time, momentum, and energy resolved pump probe tunneling spectroscopy of the nonequilibrium electrons in a Landau level (part 1).

ORAL

Abstract

Spectroscopy of nonequilibrium systems can uncover intricate relaxation mechanisms and short-lived metastable states that are hidden in strongly correlated materials. Here, we developed a novel time, momentum, and energy resolved pump-probe tunneling spectroscopy (Tr-MERTS) that allows visualization of nonequilibrium states in a two-dimensional electronic system. Tr-MERTS operates on samples and regimes inaccessible to standard optical pump-probe spectroscopy. First, Tr-MERTS can easily function in the millikelvin temperature range where many correlated electronic phases emerge. In addition, Tr-MERTS permits a precision control of the pumping electron density. Finally, the electrons can be pumped into a specific energy state even for a system with equidistant energy levels, whereas optical methods excite electrons into any available states when a transition energy equals pump photon energy. In this talk, I will discuss the operational principle of Tr-MERTS and describe basic transient features observed in a quantum Hall system.

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Presenters

  • Raymond Ashoori

    Massachusetts Institute of Technology MIT, Physics, Massachusetts Institute of Technology

Authors

  • Raymond Ashoori

    Massachusetts Institute of Technology MIT, Physics, Massachusetts Institute of Technology

  • Heun Mo Yoo

    Massachusetts Institute of Technology MIT

  • Kirk Baldwin

    Princeton Institute for the Science and Technology of Materials (PRISM), Princeton University, Princeton University, Department of Electrical Engineering, Princeton University, Electrical Engineering, Princeton, Electrical Engineering, Princeton University

  • Ken W. West

    Princeton University, Princeton Institute for the Science and Technology of Materials (PRISM), Princeton University, Department of Electrical Engineering, Princeton University, Electrical Engineering, Princeton, Electrical Engineering, Princeton University, Princeton

  • Loren Pfeiffer

    Princeton University, Princeton Institute for the Science and Technology of Materials (PRISM), Princeton University, Department of Electrical Engineering, Princeton University, Electrical Engineering, Princeton, Electrical Engineering, Princeton University, Princeton