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Related Concept Videos

Atomic Nuclei: Types of Nuclear Relaxation01:28

Atomic Nuclei: Types of Nuclear Relaxation

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Nuclear relaxation restores the equilibrium population imbalance and can occur via spin–lattice or spin–spin mechanisms, which are first-order exponential decay processes.
In spin–lattice or longitudinal relaxation, the excited spins exchange energy with the surrounding lattice as they return to the lower energy level. Among several mechanisms that contribute to spin–lattice relaxation, magnetic dipolar interactions are significant. Here, the excited nucleus transfers...
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Atomic Nuclei: Nuclear Relaxation Processes01:23

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In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
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NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of...
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In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
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Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
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We measured long single-electron spin relaxation times (T1) in bilayer graphene quantum dots, exceeding 200 μs. These findings suggest graphene is a promising material for scalable spin qubits.

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Area of Science:

  • Quantum Computing
  • Condensed Matter Physics

Background:

  • Single-electron spin relaxation time (T1) is crucial for solid-state spin qubit information lifetime.
  • Graphene and bilayer graphene (BLG) offer low spin-orbit and hyperfine interactions, making them promising for spin qubits.
  • Spin relaxation dynamics in BLG quantum dots (QDs) remain largely unexplored.

Purpose of the Study:

  • To investigate and report spin relaxation times (T1) of single-electron states in BLG QDs.
  • To assess the potential of BLG as a host material for scalable spin qubits.

Main Methods:

  • Utilized pulsed-gate spectroscopy to measure spin relaxation times.
  • Focused on single-electron states within BLG quantum dots.

Main Results:

  • Extracted spin relaxation times exceeding 200 μs at a 1.9 T magnetic field.
  • Observed a strong dependence of T1 on spin splitting, indicating potential for longer T1 at lower magnetic fields.
  • Achieved T1 values over two orders of magnitude greater than previously reported for carbon-based QDs.

Conclusions:

  • Bilayer graphene quantum dots exhibit exceptionally long spin relaxation times.
  • Graphene shows significant promise as a host material for developing scalable spin qubits with long coherence times.