Probing relaxation times in graphene quantum dots

Christian Volk, Christoph Neumann, Sebastian Kazarski, Stefan Fringes, Stephan Engels, Federica Haupt, André Müller and Christoph Stampfer ()
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Christian Volk: JARA-FIT and II. Institute of Physics B, RWTH Aachen
Christoph Neumann: JARA-FIT and II. Institute of Physics B, RWTH Aachen
Sebastian Kazarski: JARA-FIT and II. Institute of Physics B, RWTH Aachen
Stefan Fringes: JARA-FIT and II. Institute of Physics B, RWTH Aachen
Stephan Engels: JARA-FIT and II. Institute of Physics B, RWTH Aachen
Federica Haupt: JARA-FIT and Institute for Theory of Statistical Physics, RWTH Aachen
André Müller: JARA-FIT and II. Institute of Physics B, RWTH Aachen
Christoph Stampfer: JARA-FIT and II. Institute of Physics B, RWTH Aachen

Nature Communications, 2013, vol. 4, issue 1, 1-6

Abstract: Abstract Graphene quantum dots are attractive candidates for solid-state quantum bits. In fact, the predicted weak spin-orbit and hyperfine interaction promise spin qubits with long coherence times. Graphene quantum dots have been extensively investigated with respect to their excitation spectrum, spin-filling sequence and electron-hole crossover. However, their relaxation dynamics remain largely unexplored. This is mainly due to challenges in device fabrication, in particular concerning the control of carrier confinement and the tunability of the tunnelling barriers, both crucial to experimentally investigate decoherence times. Here we report pulsed-gate transient current spectroscopy and relaxation time measurements of excited states in graphene quantum dots. This is achieved by an advanced device design that allows to individually tune the tunnelling barriers down to the low megahertz regime, while monitoring their asymmetry. Measuring transient currents through electronic excited states, we estimate a lower bound for charge relaxation times on the order of 60–100 ns.

Date: 2013
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DOI: 10.1038/ncomms2738

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