Dresden 2026 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 20: 2D Materials II – Electronic and Transport Properties (joint session HL/TT)
TT 20.3: Talk
Monday, March 9, 2026, 15:30–15:45, POT/0081
Pulsed-gate spectroscopy of the electron-hole block- ade in bilayer graphene double quantum dots — •Lars Mester1,2, Hubert Dulisch1,2, Katrin Hecker1,2, Konstantinos Kontogeorgiou3, Samuel Möller1,2, Leon Stecher1, Kenji Watanabe4, Takashi Taniguchi5, Fabian Hassler3, Christian Volk1,2, and Christoph Stampfer1,2 — 1JARA-FIT and 2nd Institute of Physics, RWTH Aachen University, Aachen, Germany — 2PGI-9, Forschungszentrum Jülich, Jülich, Germany — 3JARA- Institute for Quantum Information, RWTH Aachen University, Aachen, Germany — 4Research Center for Functional Materials, Na- tional Institute for Materials Science, Namiki, Japan — 5International Center for Materials Nanoarchitectonics, National Institute for Materials Science, Namiki, Japan
Pauli blockade is an established read-out mechanism for quantum-dot (QD) spin qubits. Using bilayer graphene (BLG) as a platform offers advantages such as a tunable valley degree of freedom. Recently, a strong spin-valley blockade was demonstrated in an electron-hole BLG double quantum dot (DQD) using time-averaged transport measurements. Here, we employ pulsed-gate spectroscopy by pulsing between the (0e, 0h) and (1e, 1h) charge configurations. Comparison with sim- ulations allows us to identify unconventional higher-order tunneling as the dominant blockade-lifting mechanism, with timescales governed by QD-lead coupling and the number of accessible states. Our results provide direct access to blockade-lifting dynamics in a BLG DQD, offering relavant insights for the development of future BLG-based qubits.
Keywords: quantum dots; bilayer graphene