Dark states in a carbon nanotube quantum dot

Abstract

Illumination of atoms by resonant lasers can pump electrons into a coherent superposition of hyperfine levels which can no longer absorb the light. Such superposition is known as dark state, because fluorescent light emission is then suppressed. Here we report an all-electric analogue of this destructive interference effect in a carbon nanotube quantum dot. The dark states are a coherent superposition of valley (angular momentum) states which are decoupled from either the drain or the source leads. Their emergence is visible in asymmetric current-voltage characteristics, with missing current steps and current suppression which depend on the polarity of the applied source-drain bias. Our results demonstrate for the first time coherent-population trapping by all-electric means in an artificial atom.

References in corpus (27)

• Coupling of Spin and Orbital Motion of Electrons in Carbon Nanotubes
• Observation of Quantum Interference in Molecular Charge Transport
• Coherent and Collective Quantum Optical Effects in Mesoscopic Systems
• Quantum transport in carbon nanotubes
• Theory of Transport through Quantum-Dot Spin Valves in the Weak-Coupling Regime
• Electron Transport in Very Clean, As-Grown Suspended Carbon Nanotubes
• Large spin-orbit coupling in carbon nanotubes
• All-electronic coherent population trapping in quantum dots
• Dark states in the magnetotransport through triple quantum dots
• A benzene interference single-electron transistor
• Two-Particle Dark State in the Transport through a Triple Quantum Dot
• Symmetry fingerprints of a benzene single-electron transistor
• Control of Spin Blockade by AC Magnetic Fields in Triple Quantum Dots
• Current Switch by Coherent Trapping of Electrons in Quantum Dots
• Quantum Interference in Off-Resonant Transport through Single Molecules
• Correlation-induced conductance suppression at level degeneracy in a quantum dot
• Quantum Transport through Nanostructures with Orbital Degeneracies
• Coulomb versus spin-orbit interaction in few-electron carbon-nanotube quantum dots
• All-electric-spin control in interference single electron transistors
• Superexchange blockade in triple quantum dots
• Fano stability diagram of a symmetric triple quantum dot
• Coherent spin rotations in open driven double quantum dots
• Valley coupling in finite-length metallic single-wall carbon nanotubes
• The two classes of low energy spectra in finite carbon nanotubes
• Canyon of Current Suppression in an interacting two-level Quantum Dot
• Topographical fingerprints of many-body interference blocking in STM junctions on thin insulating films
• Blocking-state influence on shot noise and conductance in quantum dots

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• Quench dynamics of spin in quantum dots coupled to spin-polarized leads
• Bound states in the continuum in a two-channel Fano-Anderson model
• Relaxation dynamics in double-spin systems
• Pseudospin resonances reveal synthetic spin-orbit interaction
• Counting statistics of dark-state transport through a carbon nanotube quantum dot
• Photo-assisted spin transport in double quantum dots with spin-orbit interaction
• Spin-orbit interaction induces charge beatings in a lightwave-STM single molecule junction
• Intermittent decoherence blockade in a chiral ring environment
• Metastability and quantum coherence-assisted sensing in interacting parallel quantum dots
• Multilevel coherences in quantum dots
• Charge quenching at defect states in transition metal dichalcogenide-graphene van der Waals heterobilayers
• Interference and shot noise in a degenerate Anderson-Holstein model
• Making the Virtual Real: Measurement-Powered Tunneling Engines
• Precession of entangled spin and pseudospin in double quantum dots
• Survival probability of the Grover walk on the ladder graph
• Electric and Magnetic Field Nano-Sensing Using a New, Atomic-like Qubit in a Carbon Nanotube
• Giant Rabi frequencies between qubit and excited hole states in silicon quantum dots
• Dark versus blocking states in electronic transport: a Lee-Yang zero analysis of full counting statistics
• Spontaneous Scattering of Raman Photons from Cavity-QED Systems in the Ultrastrong Coupling Regime