Exciton Transport in a Germanium Quantum Dot Ladder
T. K. Hsiao (Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre, TU Delft - QCD/Vandersypen Lab)
P. Cova Fariña (TU Delft - QuTech Advanced Research Centre, TU Delft - QCD/Vandersypen Lab, Kavli institute of nanoscience Delft)
S. D. Oosterhout (TU Delft - BUS/TNO STAFF, TNO, TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft)
D. Jirovec (TU Delft - QuTech Advanced Research Centre, TU Delft - QCD/Vandersypen Lab, Kavli institute of nanoscience Delft)
X. Zhang (TU Delft - QuTech Advanced Research Centre, TU Delft - QCD/Vandersypen Lab, Kavli institute of nanoscience Delft)
C. J. Van Diepen (TU Delft - QuTech Advanced Research Centre, TU Delft - QCD/Vandersypen Lab, Kavli institute of nanoscience Delft)
W. I.L. Lawrie (Kavli institute of nanoscience Delft, TU Delft - QCD/Veldhorst Lab, TU Delft - QuTech Advanced Research Centre)
C. A. Wang (TU Delft - QCD/Veldhorst Lab, Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre)
A. Sammak (Kavli institute of nanoscience Delft, TU Delft - BUS/TNO STAFF, TU Delft - QuTech Advanced Research Centre, TNO)
G. Scappucci (Kavli institute of nanoscience Delft, TU Delft - QCD/Scappucci Lab, TU Delft - QuTech Advanced Research Centre)
M. Veldhorst (Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre, TU Delft - QN/Veldhorst Lab)
L. M.K. Vandersypen (TU Delft - QN/Vandersypen Lab, Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre)
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Abstract
Quantum systems with engineered Hamiltonians can be used to study many-body physics problems to provide insights beyond the capabilities of classical computers. Semiconductor gate-defined quantum dot arrays have emerged as a versatile platform for realizing generalized Fermi-Hubbard physics, one of the richest playgrounds in condensed matter physics. In this work, we employ a germanium 4×2 quantum dot array and show that the naturally occurring long-range Coulomb interaction can lead to exciton formation and transport. We tune the quantum dot ladder into two capacitively coupled channels and exploit Coulomb drag to probe the binding of electrons and holes. Specifically, we shuttle an electron through one leg of the ladder and observe that a hole is dragged along in the second leg under the right conditions. This corresponds to a transition from single-electron transport in one leg to exciton transport along the ladder. Our work paves the way for the study of excitonic states of matter in quantum dot arrays.
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