The multi-photon induced Fano effect

K. L. Litvinenko (), Nguyen H. Le, B. Redlich, C. R. Pidgeon, N. V. Abrosimov, Y. Andreev, Zhiming Huang and B. N. Murdin
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K. L. Litvinenko: Advanced Technology Institute, University of Surrey
Nguyen H. Le: Advanced Technology Institute, University of Surrey
B. Redlich: Institute for Molecules and Materials, Radboud University
C. R. Pidgeon: Heriot-Watt University
N. V. Abrosimov: Leibniz-Institut für Kristallzüchtung (IKZ)
Y. Andreev: Institute of Monitoring of Climatic and Ecological Systems of SB RAS
Zhiming Huang: Shanghai Institute of Technical Physics, CAS
B. N. Murdin: Advanced Technology Institute, University of Surrey

Nature Communications, 2021, vol. 12, issue 1, 1-9

Abstract: Abstract The ordinary Fano effect occurs in many-electron atoms and requires an autoionizing state. With such a state, photo-ionization may proceed via pathways that interfere, and the characteristic asymmetric resonance structures appear in the continuum. Here we demonstrate that Fano structure may also be induced without need of auto-ionization, by dressing the continuum with an ordinary bound state in any atom by a coupling laser. Using multi-photon processes gives complete, ultra-fast control over the interference. We show that a line-shape index q near unity (maximum asymmetry) may be produced in hydrogenic silicon donors with a relatively weak beam. Since the Fano lineshape has both constructive and destructive interference, the laser control opens the possibility of state-selective detection with enhancement on one side of resonance and invisibility on the other. We discuss a variety of atomic and molecular spectroscopies, and in the case of silicon donors we provide a calculation for a qubit readout application.

Date: 2021
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DOI: 10.1038/s41467-020-20534-0

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