Wigner-molecularization-enabled dynamic nuclear field programming
- URL: http://arxiv.org/abs/2207.11655v1
- Date: Sun, 24 Jul 2022 04:14:16 GMT
- Title: Wigner-molecularization-enabled dynamic nuclear field programming
- Authors: Wonjin Jang, Jehyun Kim, Jaemin Park, Gyeonghun Kim, Min-Kyun Cho,
Hyeongyu Jang, Sangwoo Sim, Byoungwoo Kang, Hwanchul Jung, Vladimir Umansky,
and Dohun Kim
- Abstract summary: We show efficient control of spin transfer between an artificial three-electron WM and the nuclear environment in a GaAs double QD.
We confirm the multiplet spin structure of a WM, paving the way for active control of newly emerging correlated electron states for application in mesoscopic environment engineering.
- Score: 2.545763876632975
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Multielectron semiconductor quantum dots (QDs) provide a novel platform to
study the role of Coulomb correlations in finite quantum systems and their
impact on many-body energy spectra. An example is the formation of
interaction-driven, spatially localized electron states of Wigner molecules
(WMs). Although Wigner molecularization has been confirmed by real-space
imaging and coherent spectroscopy, the open system dynamics of the
strongly-correlated states with the environment are not yet well understood.
Here, we demonstrate efficient control of spin transfer between an artificial
three-electron WM and the nuclear environment in a GaAs double QD. A
Landau-Zener sweep-based polarization sequence and low-lying anti-crossings of
spin multiplet states enabled by Wigner molecularization are utilized. An
efficient polarization rate of 2.58 $h \cdotp kHz \cdotp (g^* \cdotp
\mu_B)^{-1}$ per electron spin flip and, consequently, programmable nuclear
polarization by controlled single-electron tunneling are achieved. Combined
with coherent control of spin states, we achieve control of magnitude,
polarity, and site dependence of the nuclear field. It is demonstrated that the
same level of control cannot be achieved in the non-interacting regime. Thus,
we confirm the multiplet spin structure of a WM, paving the way for active
control of newly emerging correlated electron states for application in
mesoscopic environment engineering.
Related papers
- Tuning the coherent interaction of an electron qubit and a nuclear magnon [30.432877421232842]
A central spin qubit interacting coherently with an ensemble of proximal spins can be used to engineer entangled collective states or a multi-qubit register.
We demonstrate tuning of the interaction between the electron qubit and the nuclear many-body system in a GaAs quantum dot.
arXiv Detail & Related papers (2024-04-30T16:13:01Z) - Spin decoherence in VOPc@graphene nanoribbon complexes [5.691318972818067]
Carbon nanoribbon or nanographene qubit arrays can facilitate quantum-to-quantum transduction between light, charge, and spin.
We study spin decoherence due to coupling with a surrounding nuclear spin bath of an electronic molecular spin of a vanadyl phthalocyanine (VOPc) molecule integrated on an armchair-edged graphene nanoribbon (GNR)
We find that the decoherence time $T$ is anisotropic with respect to magnetic field orientation and determined only by nuclear spins on VOPc and GNR.
arXiv Detail & Related papers (2023-07-31T04:55:05Z) - Controlling quantum effects in enhanced strong-field ionisation with
machine-learning techniques [0.0]
We study quantum interference in enhanced ionisation of diatomic molecules in strong laser fields using machine learning techniques.
We find optimal conditions for enhanced ionisation in static fields and controlled ionisation release for two-colour driving fields.
This controlled ionisation manifests itself as a step-like behaviour in the time-dependent autocorrelation function.
arXiv Detail & Related papers (2022-05-06T12:43:56Z) - Molecular formations and spectra due to electron correlations in
three-electron hybrid double-well qubits [0.0]
Wigner molecules (WMs) form in three-electron hybrid qubits based on GaAs asymmetric double quantum dots.
FCI calculations enable prediction of the energy spectra and the intrinsic spatial and spin structures of the many-body wave functions.
FCI methodology can be straightforwardly extended to treat valleytronic two-band Si/SiGe hybrid qubits.
arXiv Detail & Related papers (2022-04-05T14:28:14Z) - Relativistic aspects of orbital and magnetic anisotropies in the
chemical bonding and structure of lanthanide molecules [60.17174832243075]
We study the electronic and ro-vibrational states of heavy homonuclear lanthanide Er2 and Tm2 molecules by applying state-of-the-art relativistic methods.
We were able to obtain reliable spin-orbit and correlation-induced splittings between the 91 Er2 and 36 Tm2 electronic potentials dissociating to two ground-state atoms.
arXiv Detail & Related papers (2021-07-06T15:34:00Z) - Demonstration of electron-nuclear decoupling at a spin clock transition [54.088309058031705]
Clock transitions protect molecular spin qubits from magnetic noise.
linear coupling to nuclear degrees of freedom causes a modulation and decay of electronic coherence.
An absence of quantum information leakage to the nuclear bath provides opportunities to characterize other decoherence sources.
arXiv Detail & Related papers (2021-06-09T16:23:47Z) - Controlled coherent dynamics of [VO(TPP)], a prototype molecular nuclear
qudit with an electronic ancilla [50.002949299918136]
We show that [VO(TPP)] (vanadyl tetraphenylporphyrinate) is a promising system suitable to implement quantum computation algorithms.
It embeds an electronic spin 1/2 coupled through hyperfine interaction to a nuclear spin 7/2, both characterized by remarkable coherence.
arXiv Detail & Related papers (2021-03-15T21:38:41Z) - Chemical tuning of spin clock transitions in molecular monomers based on
nuclear spin-free Ni(II) [52.259804540075514]
We report the existence of a sizeable quantum tunnelling splitting between the two lowest electronic spin levels of mononuclear Ni complexes.
The level anti-crossing, or magnetic clock transition, associated with this gap has been directly monitored by heat capacity experiments.
The comparison of these results with those obtained for a Co derivative, for which tunnelling is forbidden by symmetry, shows that the clock transition leads to an effective suppression of intermolecular spin-spin interactions.
arXiv Detail & Related papers (2021-03-04T13:31:40Z) - Electrically tuned hyperfine spectrum in neutral
Tb(II)(Cp$^{\rm{iPr5}}$)$_2$ single-molecule magnet [64.10537606150362]
Both molecular electronic and nuclear spin levels can be used as qubits.
In solid state systems with dopants, an electric field was shown to effectively change the spacing between the nuclear spin qubit levels.
This hyperfine Stark effect may be useful for applications of molecular nuclear spins for quantum computing.
arXiv Detail & Related papers (2020-07-31T01:48:57Z) - Quantum coherent spin-electric control in a molecular nanomagnet at
clock transitions [57.50861918173065]
Electrical control of spins at the nanoscale offers architectural advantages in spintronics.
Recent demonstrations of electric-field (E-field) sensitivities in molecular spin materials are tantalising.
E-field sensitivities reported so far are rather weak, prompting the question of how to design molecules with stronger spin-electric couplings.
arXiv Detail & Related papers (2020-05-03T09:27:31Z)
This list is automatically generated from the titles and abstracts of the papers in this site.
This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.