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Tailoring molecular island shapes:influence of microscopic interaction on mesostructure

Nano Research 2020年第3期13卷 843-852页

作者： Simon aeschlimann Lu Lyu Benjamin Stadtmuller martin aeschlimann Angelika Kuhnle Institute of Physical Chemistry Johannes Gutenberg University MainzDuesbergweg 10-14Mainz55099Germany Graduate School Materials Science in Mainz Staudingerweg 9Mainz55128Germany Department of Physics and Research Center OPTIMAS University of KaiserslauternErwin-Schrödinger-Straße 46Kaiserslautern67663Germany Graduate School Materials Science in Mainz Erwin-Schrodinger-Straße 46Kaiserslautern67663Germany Physical Chemistry I Faculty of ChemistryBielefeld UniversityUniversitätsstraße 25Bielefeld33615Germany

Controlling the structure formation of molecules on surfaces is fundamental for creating molecular nanostructures with tailored properties and functionalities and relies on tuning the subtle balance between intermolecular and molecule-surface *** far,however,reliable rules of design are largely lacking,preventing the controlled fabrication of self-assembled functional structures on *** addition,while so far many studies focused on varying the molecular building blocks,the impact of systematically adjusting the underlying substrate has been less frequently ***,we elucidate the potential of tailoring the mesoscopic island shape by tuning the interactions at the molecular *** a model system,we have selected the molecule dimolybdenum tetraacetate on three prototypical surfaces,Cu(111),Au(111)and CaF2(111).While providing the same hexagonal geometry,compared to Cu(111),the lattice constants of Au(111)and CaF2(111)differ by a factor of 1.1 and 1.5,*** high-resolution scanning probe microscopy images reveal molecular-level information on the resulting islands and elucidate the molecular-level design principles for the observed mesoscopic island *** study demonstrates the capability to tailor the mesoscopic island shape by exclusively tuning the substrate lattice constant,in spite of the very different electronic structure of the substrates *** work provides insights for developing general design strategies for controlling molecular mesostructures on surfaces.

关键词： scanning tunneling microscopy(STM) self-assembly island shape mesostmcture scanning probe microscopy(SPM) twodimensionBl structures

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Progress on band structure engineering of twisted bilayer and two-dimensional moiré heterostructures

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Chinese Physics B 2020年第12期29卷 5-16页

作者：姚维 martin aeschlimann 周树云 Department of Physics and Research Center OPTIMAS University of Kaiserslautern67663 KaiserslauternGermany State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics Tsinghua UniversityBeijing 100084China

Artificially constructed van der Waals heterostructures(vdWHs)provide an ideal platform for realizing emerging quantum phenomena in condensed matter *** methods for building vdWHs have been developed:stacking two-dimensional(2D)materials into a bilayer structure with different lattice constants,or with different *** interlayer coupling stemming from commensurate or incommensurate superlattice pattern plays an important role in vdWHs for modulating the band structures and generating new electronic *** this article,we review a series of novel quantum states discovered in two model vdWH systems—graphene/hexagonal boron nitride(hBN)hetero-bilayer and twisted bilayer graphene(tBLG),and discuss how the electronic structures are modified by such stacking and *** also provide perspectives for future studies on hetero-bilayer materials,from which an expansion of 2D material phase library is expected.

关键词： twisted bilayer graphene van der Waals heterostructure band structure engineering

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Tracing the formation of oxygen vacancies at the conductive LaAlO3/SrTiO3 interface via photoemission

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Opto-Electronic Science 2022年第7期1卷 33-40页

作者： Junyan Chen Tobias Eul Lu Lyu Yaolong Li Xiaoyong Hu Xingkun Ning Shufang Wang martin aeschlimann Qihuang Gong State Key Laboratory for Mesoscopic Physics&Department of Physics Collaborative Innovation Center of Quantum Matter&Frontiers Science Center for Nano-optoelectronicsBeijing Academy of Quantum Information SciencesPeking UniversityBeijing 100871China Department of Physics and Research Center OPTIMAS University of KaiserslauternKaiserslautern 67663Germany College of Physics Science&Technology Hebei UniversityBaoding 071002China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China

The two-dimensional electron gas(2DEG)generated at the LaAlO3/SrTiO3 interface has been in the focus of oxides re-search since its first *** oxygen vacancies play an important role in the generation of the insulator-to-metal transition of the SrTiO3 bare surface,their contribution at the LaAlO3/SrTiO3 interface remains *** this work,we investigated a LaAlO3/SrTiO3 heterostructure with regional distribution of defect-based localized polar sites at the *** static and time-resolved threshold photoemission electron microscopy,we prove that oxygen vacan-cies are induced near those polar sites,resulting in the increase of carrier density of the 2DEG *** addition,oxy-gen-related surface states were uncovered,which we attributed to the release of lattice oxygen during the formation of oxygen *** effects are mainly found spatially located around the defect sites at the buried interface,while other regions remain *** results confirm that the itinerant electrons induced by oxygen vacancies can coex-ist with the charge transfer mechanism in the LaAlO3/SrTiO3 heterostructure,together leading to the formation of the metallic *** observations provide fundamental insights into the nature of LaAlO3/SrTiO3 interface based 2DEG and unique perspectives for potential applications.

关键词： two-dimensional electron gas photoemission electron microscopy strontium titanate defect states

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Cavity-assisted ultrafast long-range periodic energy transfer between plasmonic nanoantennas

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Light(Science & Applications) 2017年第1期6卷 144-149页

作者： martin aeschlimann Tobias Brixner Mirko Cinchetti Benjamin Frisch Bert Hecht Matthias Hensen Bernhard Huber Christian Kramer Enno Krauss Thomas H Loeber Walter Pfeiffer martin Piecuch Philip Thielen Fachbereich Physik and Research Center OPTIMAS University of KaiserslauternErwin-Schrödinger-Str.46Kaiserslautern 67663Germany Institut für Physikalische und Theoretische Chemie Universität WürzburgAm HublandWürzburg 97074Germany Röntgen Research Center for Complex Material Systems(RCCM) Universität WürzburgAm HublandWürzburg 97074Germany Experimentelle Physik VI Fakultät PhysikTechnische Universität DortmundDortmund 44221Germany Nano‐Optics and Bio‐Photonics Group Department of Experimental Physics 5Universität WürzburgAm HublandWürzburg 97074Germany Fakultät für Physik Universität BielefeldUniversitätsstr.25Bielefeld 33615Germany Nano Structuring Centre and Research Center OPTIMAS Erwin-Schrödinger-Str.13Kaiserslautern 67663Germany Graduate School of Excellence Materials Science in Mainz Gottlieb-Daimler-Str.47Kaiserslautern 67663Germany

Radiationless energy transfer is at the core of diverse phenomena,such as light harvesting in photosynthesis1,energy-transfer-based microspectroscopies2,nanoscale quantum entanglement3 and photonic-mode ***,the transfer is efficient only for separations that are much shorter than the diffraction *** hampers its application in optical communication and quantum information processing,which require spatially selective ***,we demonstrate highly efficient radiationless coherent energy transfer over a distance of twice the excitation wavelength by combining localized and delocalized5 plasmonic *** to the Tavis–Cummings model,two whispering-gallery-mode antennas6 placed in the foci of an elliptical plasmonic cavity7 fabricated from single-crystal gold plates act as a pair of oscillators coupled to a common cavity ***-resolved two-photon photoemission electron microscopy(TR 2P-PEEM)reveals an ultrafast long-range periodic energy transfer in accordance with the *** observations open perspectives for the optimization and tailoring of mesoscopic energy transfer and long-range quantum emitter coupling.

关键词： transfer periodic quantum

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利用飞秒双光子光电子发射研究GaAs(100)的自旋动力学过程

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物理学报 2005年第7期54卷 3200-3205页

作者：郭立俊 Jan-Peter Wüstenberg Andreyev Oleksiy Michael Bauer martin aeschlimann 凯泽斯劳腾大学物理系

超短激光技术的发展为研究材料中的超快光动方学过程提供了重要的实验手段,也使得人们能够更为深入地研究电子的自旋动力学行为.GaAs(100)表面由于费米钉扎而会导致能带弯曲,位于该区域的电子及其自旋特性将会明显不同于体相材料中的情... 详细信息

超短激光技术的发展为研究材料中的超快光动方学过程提供了重要的实验手段,也使得人们能够更为深入地研究电子的自旋动力学行为.GaAs(100)表面由于费米钉扎而会导致能带弯曲,位于该区域的电子及其自旋特性将会明显不同于体相材料中的情况.利用时间分辨和自旋分辨的双光子光电子发射技术研究了p型掺杂GaAs(100)表面的电子极化动力学过程.结果表明,由费米钉扎而引起的能带弯曲明显影响电子的自旋弛豫过程,从实验上观察到了GaAs(100)表面能带弯曲区域的电子自旋翻转时间存在近2个量级的差异(从几纳秒到几十皮秒),基于电子_自旋交换相互作用的BAP机理在自旋弛豫过程中起着主导作用.

关键词：动力学过程双光子光电子发射飞秒能带弯曲交换相互作用弛豫过程动力学行为实验手段激光技术电子极化 P型掺杂发射技术时间分辨电子自旋主导作用表面 BAP 材料钉扎费米

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