Magnetic Interactions at the Nanoscale in Trilayer Titanates

Cao, Yanwei; Yang, Zhenzhong; Kareev, M.; Liu, Xiaoran; Meyers, D.; Middey, S.; Choudhury, Debraj; Shafer, Padraic; Guo, Jiandong; Freeland, J. W.; Arenholz, Elke; Gu, Lin; Chakhalian, Jak

doi:10.1103/physrevlett.116.076802

Cited by 30 publications

(30 citation statements)

References 74 publications

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“…The conductivity of the AlO/STO heterostructures used in this work is in good agreement with the previous reports 10,32,[37][38][39] , as shown in Sup- with a crystal field gap as large as ∼ 2 eV in the octahedral symmetry 9,[13][14][15][16][17][18] . Additionally, the strong spin-orbit interaction induces the splitting of the Ti 2p core level into 2p 1/2 and 2p 3/2 states.…”

Section: Resultssupporting

confidence: 92%

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Anomalous orbital structure in a spinel–perovskite interface

et al. 2016

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In all archetypical reported (001)-oriented perovskite heterostructures, it has been deduced that the preferential occupation of two-dimensional electron gases is in-plane dxy state. In sharp contrast to this, the investigated electronic structure of a spinel-perovskite heterostructure γ-Al2O3/SrTiO3 by resonant soft X-ray linear dichroism, demonstrates that the preferential occupation is out-of-plane dxz/dyz states for interfacial electrons. Moreover, the impact of strain further corroborates that this anomalous orbital structure can be linked to the altered crystal field at the interface and symmetry breaking of the interfacial structural units. Our findings provide another interesting route to engineer emergent quantum states with deterministic orbital symmetry.

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Section: Resultssupporting

confidence: 92%

“…In this geometry, both E H and E V are parallel to the interfacial plane and the intensities of linearly polarized XAS should be % of XAS, see Fig. 1c) indicating the splitting of e g and t 2g subbands with the lineshape that agrees well with the previous measurements and calculations 9,[13][14][15][16][17][18] .…”

Section: Resultssupporting

confidence: 88%

Anomalous orbital structure in a spinel–perovskite interface

et al. 2016

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“…Third, since the large quantum dot is characterized by a reduced level spacing, it may be possible to define a singlet-triplet rotating frame on the multielectron dot that is charge-noise insensitive (as demonstrated in Ref. 69) but doesn't suffer from impractically high operating frequencies (analogous to the quantum dot hybrid qubit 5,9 ). Fourth, a larger size of the multielectron quantum dot implies a reduction of the Overhauser field experienced by the electrons, and therefore a reduced dephasing rate 73 .…”

Section: Discussionmentioning

confidence: 99%

“…These parameters depend on mesoscopic details of the multielectron dot, and hence cannot be easily controlled by the choice of geometry alone. 5. The strength of the exchange interaction must provide a competitive timescale for two-qubit gates.…”

Section: Introductionmentioning

confidence: 99%

Spin of a Multielectron Quantum Dot and Its Interaction with a Neighboring Electron

et al. 2018

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We investigate the spin of a multielectron GaAs quantum dot in a sequence of nine charge occupancies, by exchange coupling the multielectron dot to a neighboring two-electron double quantum dot. For all nine occupancies, we make use of a leakage spectroscopy technique to reconstruct the spectrum of spin states in the vicinity of the interdot charge transition between a single-and a multielectron quantum dot. In the same regime we also perform time-resolved measurements of coherent exchange oscillations between the single-and multielectron quantum dot. With these measurements, we identify distinct characteristics of the multielectron spin state, depending on whether the dot's occupancy is even or odd. For three out of four even occupancies we do not observe any exchange interaction with the single quantum dot, indicating a spin-0 ground state. For the one remaining even occupancy, we observe an exchange interaction that we associate with a spin-1 multielectron quantum dot ground state. For all five of the odd occupancies, we observe an exchange interaction associated with a spin-1/2 ground state. For three of these odd occupancies, we clearly demonstrate that the exchange interaction changes sign in the vicinity of the charge transition. For one of these, the exchange interaction is negative (i.e. triplet-preferring) beyond the interdot charge transition, consistent with the observed spin-1 for the next (even) occupancy. Our experimental results are interpreted through the use of a Hubbard model involving two orbitals of the multielectron quantum dot. Allowing for the spin correlation energy (i.e. including a term favoring Hund's rules) and different tunnel coupling to different orbitals, we qualitatively reproduce the measured exchange profiles for all occupancies.

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“…Particular designed systems are based on charge [22][23][24] or spin [25,26] degrees of freedom. Non-adiabatic control, which depends exclusively on the electric field control, has been demonstrated in GaAs double quantum dot (DQD) charge qubit [27,28].…”

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confidence: 99%

Universal non-adiabatic geometric manipulation of pseudo-spin charge qubits

Mousolou

2017

EPL

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Reliable quantum information processing requires high fidelity universal manipulation of quantum systems within the characteristic coherence times. Non-adiabatic holonomic quantum computation offers a promising approach to implement fast, universal, and robust quantum logic gates particularly useful in nano-fabricated solid-state architectures, which typically have short coherence times. Here, we propose an experimentally feasible scheme to realize high-speed universal geometric quantum gates in nano-engineered pseudo-spin charge qubits. We use a system of three coupled quantum dots containing a single electron, where two computational states of a double quantum dot charge qubit interact through an intermediate quantum dot. The additional degree of freedom introduced into the qubit makes it possible to create a geometric model system, which allows robust and efficient single-qubit rotations through careful control of the inter-dot tunneling parameters. We demonstrate that a capacitive coupling between two charge qubits permits a family of non-adiabatic holonomic controlled two-qubit entangling gates, and thus provides a promising procedure to maintain entanglement in charge qubits and a pathway toward faulttolerant universal quantum computation. We estimate the feasibility of the proposed structure by analyzing the gate fidelities to some extent.

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Magnetic Interactions at the Nanoscale in Trilayer Titanates

Cited by 30 publications

References 74 publications

Anomalous orbital structure in a spinel–perovskite interface

Anomalous orbital structure in a spinel–perovskite interface

Spin of a Multielectron Quantum Dot and Its Interaction with a Neighboring Electron

Universal non-adiabatic geometric manipulation of pseudo-spin charge qubits

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