Magnetic-Field Dependence of Tunnel Couplings in Carbon Nanotube Quantum Dots

Abstract

By means of sequential and cotunneling spectroscopy, we study the tunnel couplings between metallic leads and individual levels in a carbon nanotube quantum dot. The levels are ordered in shells consisting of two doublets with strong- and weak-tunnel couplings, leading to gate-dependent level renormalization. By comparison to a one- and two-shell model, this is shown to be a consequence of disorder-induced valley mixing in the nanotube. Moreover, a parallel magnetic field is shown to reduce this mixing and thus suppress the effects of tunnel renormalization.

arXiv comment5 pages, 3 figures; revised version as published

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• Transport mirages in single-molecule devices
• Josephson effect in a few-hole quantum dot
• Heat current across a capacitively coupled double quantum dot for high magnetic field
• Orbital Kondo spectroscopy in a double quantum dot system
• Shaping electron wave functions in a carbon nanotube with a parallel magnetic field
• Nonequilibrium conductance through a benzene molecule in the Kondo regime
• Blocking transport resonances via Kondo entanglement in quantum dots
• The two classes of low energy spectra in finite carbon nanotubes
• Restoring the SU(4) Kondo regime in a double quantum dot system
• Relation between width of the zero-bias anomaly and Kondo temperaure in transport measurements through correlated quantum dots: Effect of asymmetric coupling to the leads
• Kondo effect in a carbon nanotube with spin-orbit interaction and valley mixing: A DM-NRG study
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• Steady-state and quench dependent relaxation of a quantum dot coupled to one-dimensional leads
• Two-stage three-channel Kondo physics for an FePc molecule on the Au(111) surface
• Kondo behavior and conductance through $3d$ impurities in gold chains doped with oxygen
• Intra- and inter-shell Kondo effects in carbon nanotube quantum dots
• Nanoscale magnetic resonance spectroscopy using a carbon nanotube double quantum dot
• Cotunneling renormalization in carbon nanotube quantum dots
• From Transparent Conduction to Coulomb Blockade at Fixed Hole Number
• Nanotube Double Quantum Dot Spin Transducer for Scalable Quantum Information Processing
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