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Akademický článek

Decelerated lattice excitation and absence of bulk phonon modes at surfaces: Ultra-fast electron diffraction from Bi(111) surface upon fs-laser excitation

Autor: V. Tinnemann, C. Streubühr, B. Hafke, T. Witte, A. Kalus, A. Hanisch-Blicharski, M. Ligges, P. Zhou, D. von der Linde, U. Bovensiepen, M. Horn-von Hoegen

Publikováno v: Structural Dynamics, Vol 6, Iss 6, Pp 065101-065101-5 (2019)

Ultrafast reflection high-energy electron diffraction is employed to follow the lattice excitation of a Bi(111) surface upon irradiation with a femtosecond laser pulse. The thermal motion of the atoms is analyzed through the Debye–Waller effect. Wh

Externí odkaz: https://doaj.org/article/8817398fa60a494b9c0b8b6aa128cc07

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Akademický článek

Condensation of ground state from a supercooled phase in the Si(111)-(4 × 1) → (8 × 2)-indium atomic wire system

Autor: B. Hafke, T. Witte, D. Janoschka, P. Dreher, F.-J. Meyer zu Heringdorf, M. Horn-von Hoegen

Publikováno v: Structural Dynamics, Vol 6, Iss 4, Pp 045101-045101-5 (2019)

Strong optical irradiation of indium atomic wires on a Si(111) surface causes the nonthermal structural transition from the (8 × 2) reconstructed ground state to an excited (4 × 1) state. The immediate recovery of the system to the ground state i

Externí odkaz: https://doaj.org/article/1e322dd5b52043ec840b2a8b4d3a4ac8

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Akademický článek

Ultrafast electron diffraction from a Bi(111) surface: Impulsive lattice excitation and Debye–Waller analysis at large momentum transfer

Autor: V. Tinnemann, C. Streubühr, B. Hafke, A. Kalus, A. Hanisch-Blicharski, M. Ligges, P. Zhou, D. von der Linde, U. Bovensiepen, M. Horn-von Hoegen

Publikováno v: Structural Dynamics, Vol 6, Iss 3, Pp 035101-035101-9 (2019)

The lattice response of a Bi(111) surface upon impulsive femtosecond laser excitation is studied with time-resolved reflection high-energy electron diffraction. We employ a Debye–Waller analysis at large momentum transfer of 9.3 Å−1 ≤ Δ k ≤

Externí odkaz: https://doaj.org/article/ba790007fdf94476a73c45b5be73b31b

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Akademický článek

Non-equilibrium lattice dynamics of one-dimensional In chains on Si(111) upon ultrafast optical excitation

Autor: T. Frigge, B. Hafke, T. Witte, B. Krenzer, M. Horn-von Hoegen

Publikováno v: Structural Dynamics, Vol 5, Iss 2, Pp 025101-025101-7 (2018)

The photoinduced structural dynamics of the atomic wire system on the Si(111)-In surface has been studied by ultrafast electron diffraction in reflection geometry. Upon intense fs-laser excitation, this system can be driven in around 1 ps from the in

Externí odkaz: https://doaj.org/article/089e0b40d6ea4a37bae46a97f2295c7c

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Akademický článek

Spot profile analysis and lifetime mapping in ultrafast electron diffraction: Lattice excitation of self-organized Ge nanostructures on Si(001)

Autor: T. Frigge, B. Hafke, V. Tinnemann, T. Witte, M. Horn-von Hoegen

Publikováno v: Structural Dynamics, Vol 2, Iss 3, Pp 035101-035101-10 (2015)

Ultrafast high energy electron diffraction in reflection geometry is employed to study the structural dynamics of self-organized Germanium hut-, dome-, and relaxed clusters on Si(001) upon femtosecond laser excitation. Utilizing the difference in siz

Externí odkaz: https://doaj.org/article/2511a7ce6ce94beeb9213e5ebda050b8

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Measurement of Electropotential Waves in Intact Phloem Sieve Elements Using Microelectrodes

Autor: Matthias R, Zimmermann, Jens B, Hafke, Maria K, Paulmann, Alexandra C U, Furch

Publikováno v: Methods in molecular biology (Clifton, N.J.). 2014

Electropotential waves (EPW) are involved in plant responses to both abiotic and biotic stresses. Three different types of EPWs have been identified: action potential, variation potential, and system potential, all of which have been indicated to par

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=pmid________::c0e163b3d39c2c07219ff1b7e8ff5168
https://pubmed.ncbi.nlm.nih.gov/31197815

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Thermally Induced Crossover from 2D to 1D Behavior in an Array of Atomic Wires: Silicon Dangling-Bond Solitons in Si(553)-Au

Autor: B. Hafke, Björn Sothmann, T. Witte, Steven C. Erwin, C. Brand, M. Horn-von Hoegen

Publikováno v: Physical review letters. 124(1)

The self-assembly of submonolayer amounts of Au on the densely stepped Si(553) surface creates an array of closely spaced ``atomic wires'' separated by 1.5 nm. At low temperature, charge transfer between the terraces and the row of silicon dangling b

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8ff6d7a79810e69f62891a8cb966914f
https://pubmed.ncbi.nlm.nih.gov/31976688

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Adsorbate induced manipulation of 1D atomic wires: Degradation of long-range order in the Si(553)-Au system

Autor: M. Horn-von Hoegen, T. Witte, B. Hafke, C. Brand

Publikováno v: Surface Science. 700:121673

Deposition of Au on vicinal Si(553) surfaces results in the self-assembly of one-dimensional (1D) Au atomic wires. Charge transfer from the Au wire to the Si step edge leads to a chain of Si dangling-bond orbitals with a long range ordered threefold

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::97df46647addba29921b8974e879795f
https://doi.org/10.1016/j.susc.2020.121673

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