The Role of Multilevel Landau-Zener Interference in Extreme Harmonic Generation

TL;DR

This paper investigates how multilevel Landau-Zener interference explains multiphoton electric dipole spin resonance in a driven quantum dot system, revealing complex resonance behaviors and population transfer mechanisms.

Contribution

It introduces a theoretical model showing that multilevel Landau-Zener interference accounts for observed multiphoton resonances in a double quantum dot.

Findings

Reproduces experimental multiphoton resonances up to 8 photons

Identifies odd-even dependence in resonance strength

Shows oscillations in electric dipole spin resonance signal

Abstract

Motivated by the observation of multiphoton electric dipole spin resonance processes in InAs nanowires, we theoretically study the transport dynamics of a periodically driven five-level system, modeling the level structure of a two-electron double quantum dot. We show that the observed multiphoton resonances, which are dominant near interdot charge transitions, are due to multilevel Landau-Zener-Stuckelberg-Majorana interference. Here a third energy level serves as a shuttle that transfers population between the two resonant spin states. By numerically integrating the master equation we replicate the main features observed in the experiments: multiphoton resonances (as large as 8 photons), a robust odd-even dependence, and oscillations in the electric dipole spin resonance signal as a function of energy level detuning.