Spectroscopy of Equilibrium and Non-Equilibrium Charge Transfer in Semiconductor Quantum Structures

Abstract

We investigate equilibrium and non-equilibrium charge-transfer processes by performing high-resolution transport spectroscopy. Using electrostatically defined quantum dots for energy-selective emission and detection, we achieved unprecedented spectral resolution and a high degree of tunability of relevant experimental parameters. Most importantly, we observe that the spectral width of elastically transferred electrons can be substantially smaller than the linewidth of a thermally broadened Coulomb peak. This finding indicates that the charge-transfer process is fast compared to the electron--phonon interaction time. By drawing an analogy to double quantum dots, we argue that the spectral width of the elastic resonance is determined by the lifetime broadening $h\Gamma$ of the emitter and detector states. Good agreement with the model is found also in an experiment in which the charge transfer is in the regime $h\Gamma \gg k_{\mathrm{B}}T$. By performing spectroscopy below the Fermi energy, we furthermore observe elastic and inelastic transfer of holes.

References in corpus (7)

• Electron transport through double quantum dots
• Counting statistics of single-electron transport in a quantum dot
• Non-Equilibrium Edge Channel Spectroscopy in the Integer Quantum Hall Regime
• Energy Relaxation in the Integer Quantum Hall Regime
• Local Thermometry of Neutral Modes on the Quantum Hall Edge
• Weak measurement of cotunneling time
• Ballistic electron spectroscopy

Cited by in corpus (8)

• Transport Spectroscopy of a Spin-Coherent Dot-Cavity System
• Relaxation and revival of quasiparticles injected in an interacting quantum Hall liquid
• Spectroscopic study on hot-electron transport in a quantum Hall edge channel
• Auger-spectroscopy in quantum Hall edge channels: a possible resolution to the missing energy problem
• Cavity-mediated coherent coupling between distant quantum dots
• Hot Carrier Nanowire Transistors at the Ballistic Limit
• Ultrafast energy relaxation of quantum dot-generated 2D hot electrons
• Transport spectroscopy of singlet-triplet quantum dot states coupled to electronic cavities