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000189771 1001_ $$0P:(DE-HGF)0$$aVolk, Christian$$b0
000189771 245__ $$aProbing relaxation times in graphene quantum dots
000189771 260__ $$aLondon$$bNature Publishing Group$$c2013
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000189771 520__ $$aGraphene 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.
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000189771 7001_ $$0P:(DE-Juel1)156572$$aNeumann, Christoph$$b1
000189771 7001_ $$0P:(DE-HGF)0$$aKazarski, Sebastian$$b2
000189771 7001_ $$0P:(DE-HGF)0$$aFringes, Stefan$$b3
000189771 7001_ $$0P:(DE-HGF)0$$aEngels, Stephan$$b4
000189771 7001_ $$0P:(DE-HGF)0$$aHaupt, Federica$$b5
000189771 7001_ $$0P:(DE-HGF)0$$aMüller, André$$b6
000189771 7001_ $$0P:(DE-HGF)0$$aStampfer, Christoph$$b7$$eCorresponding Author
000189771 773__ $$0PERI:(DE-600)2553671-0$$a10.1038/ncomms2738$$gVol. 4, p. 1753 -$$p1753 $$tNature Communications$$v4$$x2041-1723$$y2013
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000189771 9141_ $$y2014
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