Charge and spin transport on surfaces and atomic layers measured by multi-probe techniques

Hasegawa, Shuji

doi:10.1088/1361-648x/ab0bf4

Cited by 5 publications

(6 citation statements)

References 66 publications

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“…26) This was measured in situ using a four-point probe operating in UHV to preserve the ML structure without oxidation/contamination. 56,57) This is called Rashba superconductivity, which can be beyond the conventional superconductivity of the BCS theory, because the BCS theory is based on spin degeneracy.…”

Section: Symmetry Breaking At Surfaces and Interfacesmentioning

confidence: 99%

Surface and interface physics driven by quantum materials

Hasegawa

2024

Appl. Phys. Express

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Electronic states at boundaries of crystals, such as surfaces, interfaces, edges, hinges, corners, and extremities, play crucial roles in emerging quantum materials like graphene and similar monatomic-layer materials, van der Waals crystals, and topological insulators. Electronic states at such boundaries are different from those inside the three- or two-dimensional crystals, not only due to the truncation of crystal lattices, but also due to space-inversion-symmetry breaking and difference of topology in band structures across the boundaries. Such quantum materials are expected to advance energy-saving/-harvesting technology as well as quantum computing/information technology because of exotic phenomena such as electron’s spin-momentum locking, pure spin current, dissipation-less charge current, non-reciprocal current, possible Majorana fermions, and so on. In this review, their fundamental concepts are introduced from the viewpoint of surface physics, in which atomic and electronic structures as well as charge/spin transport properties are directly probed using state-of-art techniques.

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Section: Symmetry Breaking At Surfaces and Interfacesmentioning

confidence: 99%

Surface and interface physics driven by quantum materials

Hasegawa

2024

Appl. Phys. Express

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“…Therefore, multiprobe (MP) microscopy techniques were introduced, [2][3][4][5][6][7] which can accurately control the positions of multiple probes on the μmto -nm scale. For example, local inplane electrical conduction, including anisotropy, can be directly measured.…”

Section: Introductionmentioning

confidence: 99%

Laser-combined multiprobe microscopy and its application to the materials with atomic layer thickness

Mogi

Wang

Kuroda

et al. 2022

Jpn. J. Appl. Phys.

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We have developed a method of evaluating the photoinduced carrier dynamics of nanostructures by combining optical technologies with multiprobe microscopy techniques. Using multiple probes, measurement can be carried out even for a small sample without complicated pretreatments, such as attaching electrode structures. Using transition metal dichalcogenides (TMDCs) as a sample and a continuous laser or an ultrashort pulse laser as the light source, we demonstrated analyses of the carrier dynamics related to trap levels in a millisecond to second time domain and the ultrafast photoexcited carrier dynamics in the picosecond region.

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“…Researches on two-dimensional (2D) superconductors have greatly progressed in recent years thanks to various kinds of highly crystalline atomic-layer materials found [1,2] and in situ transport measurement techniques in ultrahigh vacuum (UHV) at low temperature [3]. There are many intriguing phenomena already found in the 2D superconducting systems, for example, the superconductor-insulator transition (SIT) in Bi thin films and others [4], the SIT mediated by a quantum metal phase [5,6], and higher critical temperatures (T c ) than those of bulk materials [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Superconducting proximity effect in a Rashba-type surface state of Pb/Ge(111)

Huang

Toyama

Bondarenko

et al. 2020

Supercond. Sci. Technol.

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The Rashba superconductor, in which spin-splitting bands become superconducting, is fascinating as a novel superconducting system in low dimensional systems. Here, we present the results of in-situ transport measurements on a Rashba-type surface state of the striped incommensurate (SIC) phase of a Pb atomic layer on Ge(111) surface with additional Pb islands/clusters on it. We found that two-step superconducting transitions at around 7 K and 3 K occurred. The latter superconducting transition is suggested to be induced at the non-superconducting Rashba SIC area because of the lateral proximity effect caused by the superconducting Pb clusters. Our results propose a new type of Rashba superconductor, which is a new platform to understand the Rashba superconducting systems.

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Charge and spin transport on surfaces and atomic layers measured by multi-probe techniques

Cited by 5 publications

References 66 publications

Surface and interface physics driven by quantum materials

Surface and interface physics driven by quantum materials

Laser-combined multiprobe microscopy and its application to the materials with atomic layer thickness

Superconducting proximity effect in a Rashba-type surface state of Pb/Ge(111)

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