Spectroscopy
Gold dithiolene radical holds a 21 μs spin qubit
Open access · cc by · source: Europe PMC
Neutral [Au(adt)2] stores the unpaired electron on the ligand, giving phase-memory times up to 21 μs in low-spin solvents and 1.44 μs when doped into a nickel molecular semiconductor.
How this study connects
Role on claims
Each row is a claim on a concept or method page where this paper supports, challenges, or qualifies the statement. Roles are hand-checked — not a model guess.
A gold dithiolene ligand radical is indexed with this method, but the quoted observables are XRD/EPR and coherence: TM reaches 21 μs in 4:1 CS₂/CCl₄ and 15.6–17.6 μs at 10 K in other glasses; Ni dilution shortens TM to 1.44 μs at 10 K. SOC still kills coherence above ~80 K. Those are spin-qubit figures, not Raman peak positions.
Evidence for the claim as stated.
A method-index tag is not a guarantee that the teaching numbers came from Raman. The gold adt radical’s 21 μs TM is pulsed EPR in a glass; the Zn gap is DFT; the battery retention is galvanostatic cycling. Raman can be in the characterisation stack without being the quantity you should quote in an exam answer.
Evidence for the claim as stated.
Open questions
Tensions this paper is part of
From concept pages' “where studies disagree.” Disagreement means the same question; scope means different assays, populations, or outcomes.
A method-index tag is not a guarantee that the teaching numbers came from Raman. The gold adt radical’s 21 μs TM is pulsed EPR in a glass; the Zn gap is DFT; the battery retention is galvanostatic cycling. Raman can be in the characterisation stack without being the quantity you should quote in an exam answer.
- Supports · A new Zn phenanthroline–maleate crystal
- Supports · Stibnite in carbon sheets stores sodium better
Study at a glance
- Design
- Other — EPR spin-relaxation of [Au(adt)2]−/0 diluted in glassy solvents and isoelectronic Ni matrix
- N
- Molecular spin-qubit materials study — no sample N
- Population
- Gold dithiolene radical complexes in frozen solutions and Ni dilution solids
- Outcome
- Phase-memory times enabling single-qubit addressability
Structured fields used in claim comparison tables when every cited study has a complete layer.
Inspect source passages
Gold dithiolene radical holds a 21 μs spin qubit
These passages occur verbatim in the stored paper text. They support the points listed below; they do not verify every statement in the explanation.
TM was 15.6 μs at 10 K and 17.6 μs at gz.
An exceedingly long phase memory time of 15.6 μs is recorded for 2 at 10 K, and this increases to 17.6 μs when the field position is shift to 375.7 mT corresponding to g z , an increase of 12% which aligns with the orientation dependence observed for T 1,s ( vide supra ).
Ni-host dilution gave TM of 1.44 μs at 10 K.
The solid dilution of 2 in [Ni(adt) 2 ] afforded the shortest T M,s of 1.44 μs at 10 K, an order of magnitude smaller than for the frozen solution samples ().
Key findings
TM reaches 21 μs in 4:1 CS2/CCl4 and 15.6–17.6 μs at 10 K in other glasses. Solid Ni dilution shortens TM to 1.44 μs at 10 K via faster T1 in the semiconductor. Hyperfine is tiny versus Au quadrupole because 5d admixture is small.
Methodology
Authors prepared [Au(adt)2]−/0, assigned Au(III) ligand-radical character by XRD/EPR, measured T1 and TM from 5–80 K in CS2/CCl4-type solvents, and diluted the S=1/2 molecule in isoelectronic [Ni(adt)2].
Limitations
SOC still kills coherence above ~80 K; room-temperature addressable qubits are not demonstrated.
Related papers in this topic
Same topic cluster — not a recommendation engine.