A theoretical review on the single-impurity electron spin resonance on surfaces

Delgado, Fernando; Lorente, Nicolás

doi:10.1016/j.progsurf.2021.100625

Cited by 19 publications

(11 citation statements)

References 76 publications

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“…Larger values of Ω have been achieved using ESR-STM, where several different driving mechanisms other than Zeeman interaction with the AC field have been proposed. [41][42][43][44] For Ti-H on MgO, and S = 1/2 spin system, AC magnetic fields up to 1 mT have been reported, 40 with an induced Rabi frequency Ω/2π ∼ 10 MHz in continuous mode, while Rabi frequencies up to 30 MHz have been demonstrated in pulsed ESR-STM 45 or using double resonance under large AC voltages. 46 Moreover, these conditions can be achieved while keeping the Ω 2 T 1 T 2 factor larger than one.…”

Section: Estimate Of Maximal DC Currentmentioning

confidence: 99%

Electrically-detected single-spin resonance with Quantum Spin Hall edge states

Delgado¹,

Fernández-Rossier²

2022

Preprint

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Detection is most often the main impediment to reduce the number of spins in paramagnetic resonance experiments. Here we propose a new route to carry out electrically-detected spin resonance of an individual spin, placed at the edge of a quantum spin Hall insulator (QSHI). The edges of a QSHI host a one dimensional electron gas with perfect spin-momentum locking. Therefore, the spin relaxation induced by emission of an electron-hole pair at the edge state of the QSHI can generate current. Here we demonstrate that driving the system with an AC signal, a nonequilibrium occupation can be induced in the absence of applied bias voltage, resulting in a DC measurable current. We compute the DC current as a function of the Rabi frequency Ω, the spin relaxation and decoherence times, T1 and we discuss the feasibility of this experiment with state of the art instrumentation.

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Section: Estimate Of Maximal DC Currentmentioning

confidence: 99%

Electrically-detected single-spin resonance with Quantum Spin Hall edge states

Delgado¹,

Fernández-Rossier²

2022

Preprint

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“…There are numerous other ESR-STM mechanisms that have been proposed (for a recent review, see Ref. [92]). Direct driving from oscillating magnetic fields in the tunnel junction was estimated to be negligible compared to the observed Rabi rates [74,70], although a careful RF simulation of the tunnel junction has yet to be performed.…”

Section: Single Spin Control In Esr-stm and Its Mechanismmentioning

confidence: 99%

Harnessing the Quantum Behavior of Spins on Surfaces

Chen,

Bae,

Heinrich

2021

Preprint

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The desire to control and measure individual quantum systems such as atoms and ions in a vacuum has led to significant scientific and engineering developments in the past decades that form the basis of today's quantum information science. Single atoms and molecules on surfaces, on the other hand, are heavily investigated by physicists, chemists, and material scientists in search of novel electronic and magnetic functionalities. These two paths crossed in 2015 when it was first clearly demonstrated that individual spins on a surface can be coherently controlled and read out in an all-electrical fashion. The enabling technique is a combination of scanning tunneling microscopy (STM) and electron spin resonance (ESR), which offers unprecedented coherent controllability at the Angstrom length scale. This review aims to illustrate the essential ingredients that allow the quantum operations of single spins on surfaces. Three domains of applications of surface spins, namely quantum sensing, quantum control, and quantum simulation, are discussed with physical principles explained and examples presented. Enabled by the atomically-precise fabrication capability of STM, single spins on surfaces might one day lead to the realization of quantum nanodevices and artificial quantum materials at the atomic scale.

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“…The recent development of STM-based single-atom electron paramagnetic/spin resonance (EPR/ESR) [34,35,36,19,37,38,39,40,41,23,24,42] led to several breakthroughs and enabled the possibility of detecting the weak hyperfine interaction associated to single Ti, Fe, Cu adatoms and Ti dimer on MgO/Ag(001) [43,1,2]. We note that a deep understanding of the mechanism enabling the STM-based EPR/ESR experiment is still a puzzle under heavy investigation [44,45,46,47,41,48,49]. Regarding the hyperfine interactions, it is interesting that they were detected, so far, on a limited set of adatoms on a bilayer of MgO film.…”

Section: Introductionmentioning

confidence: 98%

Interplay of magnetic states and hyperfine fields of iron dimers on MgO(001)

Shehada,

Dias,

Abusaa

et al. 2022

Preprint

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Individual nuclear spin states can have very long lifetimes and could be useful as qubits. Progress in this direction was achieved on MgO/Ag(001) via detection of the hyperfine interaction (HFI) of Fe, Ti and Cu adatoms using scanning tunneling microscopy (STM) [1,2]. Previously, we systematically quantified from first-principles the HFI for the whole series of 3d transition adatoms (Sc-Cu) deposited on various ultra-thin insulators, establishing the trends of the computed HFI with respect to the filling of the magnetic s-and d-orbitals of the adatoms and on the bonding with the substrate [3]. Here we explore the case of dimers by investigating the correlation between the HFI and the magnetic state of free standing Fe dimers, single Fe adatoms and dimers deposited on a bilayer of MgO(001). We find that the magnitude of the HFI can be controlled by switching the magnetic state of the dimers. For short Fe-Fe distances, the antiferromagnetic state enhances the HFI with respect to that of the ferromagnetic state. By increasing the distance between the magnetic atoms, a transition towards the opposite behavior is observed. Furthermore, we demonstrate the ability to substantially modify the HFI by atomic control of the location of the adatoms on the substrate. Our results establish the limits of applicability of the usual hyperfine hamiltonian and we propose an extension based on multiple scattering processes.

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A theoretical review on the single-impurity electron spin resonance on surfaces

Cited by 19 publications

References 76 publications

Electrically-detected single-spin resonance with Quantum Spin Hall edge states

Electrically-detected single-spin resonance with Quantum Spin Hall edge states

Harnessing the Quantum Behavior of Spins on Surfaces

Interplay of magnetic states and hyperfine fields of iron dimers on MgO(001)

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