Landau-Zener-Stückelberg-Majorana Interferometry of a Single Hole

We perform Landau-Zener-Stückelberg-Majorana (LZSM) spectroscopy on a system with strong spin-orbit interaction (SOI), realized as a single hole confined in a gated double quantum dot. Analogous to electron systems, at a magnetic field B=0 and high modulation frequencies, we observe photon-assisted...

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Bibliographic Details
Published in:Physical review letters 2018-05, Vol.120 (20), p.207701-207701
Main Authors: Bogan, Alex, Studenikin, Sergei, Korkusinski, Marek, Gaudreau, Louis, Zawadzki, Piotr, Sachrajda, Andy S, Tracy, Lisa, Reno, John, Hargett, Terry
Format: Article
Language:English
Subjects:
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Interference
Magnetic fields
Quantum dots
Spectrum analysis
Spin-orbit interactions
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Summary:We perform Landau-Zener-Stückelberg-Majorana (LZSM) spectroscopy on a system with strong spin-orbit interaction (SOI), realized as a single hole confined in a gated double quantum dot. Analogous to electron systems, at a magnetic field B=0 and high modulation frequencies, we observe photon-assisted tunneling between dots, which smoothly evolves into the typical LZSM funnel-shaped interference pattern as the frequency is decreased. In contrast to electrons, the SOI enables an additional, efficient spin-flip interdot tunneling channel, introducing a distinct interference pattern at finite B. Magnetotransport spectra at low-frequency LZSM driving show the two channels to be equally coherent. High-frequency LZSM driving reveals complex photon-assisted tunneling pathways, both spin conserving and spin flip, which form closed loops at critical magnetic fields. In one such loop, an arbitrary hole spin state is inverted, opening the way toward its all-electrical manipulation.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.120.207701