Electron spin resonance-scanning tunneling microscopy

Balatsky, Alexander V.; Nishijima, Michiharu; Manassen, Yishay

doi:10.1080/00018732.2012.668775

Cited by 61 publications

(70 citation statements)

References 47 publications

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“…Moreover, a similar situation takes place at high temperatures k B T F , when one can disregard the Pauli exclusion principle and assume that all electrons are uncorrelated. Figure 7 shows that the experimentally obtained integrated noise power depends on temperature linearly, in agreement with (125), but has a finite offset value at T = 0 in agreement with (126).…”

Section: 13supporting

confidence: 80%

The theory of spin noise spectroscopy: a review

Sinitsyn¹,

Pershin²

2016

Rep. Prog. Phys.

115

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Direct measurements of spin fluctuations are becoming the mainstream approach for studies of complex condensed matter, molecular, nuclear, and atomic systems. This review covers recent progress in the field of optical spin noise spectroscopy (SNS) with an additional goal to establish an introduction into its theoretical foundations. Various theoretical techniques that have been recently used to interpret results of SNS measurements are explained alongside examples of their applications.

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Section: 13supporting

confidence: 80%

The theory of spin noise spectroscopy: a review

Sinitsyn¹,

Pershin²

2016

Rep. Prog. Phys.

115

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“…Finding other magnetic atoms and surfaces that permit STM-EPR experiments, beyond Fe on MgO, will be be another milestone for the development of this field. From the theory side it will be important to understand in detail the mechanisms that make it possible to couple ac electric fields to the spin of the surface atoms [196,197]. Another challenge for theory is to have a realistic description of the system on two counts.…”

Section: Outlook and Conclusionmentioning

confidence: 99%

Spin decoherence of magnetic atoms on surfaces

Delgado

Fernández-Rossier

2017

Progress in Surface Science

105

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We review the problem of spin decoherence of magnetic atoms deposited on a surface. Recent breakthroughs in scanning tunnelling microscopy (STM) make it possible to probe the spin dynamics of individual atoms, either isolated or integrated in nanoengineered spin structures. Transport pump and probe techniques with spin polarized tips permit measuring the spin relaxation time T 1 , while novel demonstration of electrically driven STM single spin resonance has provided a direct measurement of the spin coherence time T 2 of an individual magnetic adatom. Here we address the problem of spin decoherence from the theoretical point of view. First we provide a short general overview of decoherence in open quantum systems and we discuss with some detail ambiguities that arise in the case of degenerate spectra, relevant for magnetic atoms. Second, we address the physical mechanisms that allows probing the spin coherence of magnetic atoms on surfaces. Third, we discuss the main spin decoherence mechanisms at work on a surface, most notably, Kondo interaction, but also spin-phonon coupling and dephasing by Johnson noise. Finally, we briefly discuss the implications in the broader context of quantum technologies.

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“…In this regard, electron paramagnetic resonance (EPR) is an established method [14] that has found diverse applications such as the identification of free radicals in chemical reactions [15], detection of spin-labeled molecules in biological systems [16], or the study of molecular nanomagnets [17]. Following early attempts [18,19], Baumann et al [20] were the first to convincingly demonstrate EPR of single atoms on a surface using STM. In these experiments [20][21][22][23], the authors studied single Fe, Ti, and Cu atoms on a thin insulating MgO layer grown on Ag (100) (see Fig.…”

Section: Introductionmentioning

confidence: 99%

Single-atom electron paramagnetic resonance in a scanning tunneling microscope driven by a radio-frequency antenna at 4 K

Seifert

Kovarik

Nistor

et al. 2020

Phys. Rev. Research

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Combining electron paramagnetic resonance (EPR) with scanning tunneling microscopy (STM) enables detailed insight into the interactions and magnetic properties of single atoms on surfaces. A requirement for EPR-STM is the efficient coupling of microwave excitations to the tunnel junction. Here, we achieve a coupling efficiency of the order of unity by using a radiofrequency antenna placed parallel to the STM tip, which we interpret using a simple capacitive-coupling model. We further demonstrate the possibility to perform EPR-STM routinely above 4 K using amplitude as well as frequency modulation of the radiofrequency excitation. We directly compare different acquisition modes on hydrogenated Ti atoms and highlight the advantages of frequency and magnetic field sweeps as well as amplitude and frequency modulation in order to maximize the EPR signal. The possibility to tune the microwave-excitation scheme and to perform EPR-STM at relatively high temperature and high power opens this technique to a broad range of experiments, ranging from pulsed EPR spectroscopy to coherent spin manipulation of single atom ensembles.

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Electron spin resonance-scanning tunneling microscopy

Cited by 61 publications

References 47 publications

The theory of spin noise spectroscopy: a review

The theory of spin noise spectroscopy: a review

Spin decoherence of magnetic atoms on surfaces

Single-atom electron paramagnetic resonance in a scanning tunneling microscope driven by a radio-frequency antenna at 4 K

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