Dr. Sebastian Heeg

Profil

Zusammenfassung

Dr. Sebastian Heeg erforscht die optischen und mechanischen Eigenschaften von eindimensionalen und zweidimensionalen Nanomaterialien, insbesondere Carbyne, Kohlenstoffnanoröhren und 2D-Halbleiter. Seine Expertise liegt in der Charakterisierung dieser Materialien durch spektroskopische Methoden wie Raman-Spektroskopie und Nahfeld-Mikroskopie sowie in der Kontrolle ihrer Eigenschaften durch mechanische Dehnung. Diese Kompetenzen sind für die Entwicklung von optoelektronischen Bauelementen und Sensoren relevant.

Skills

Name

Dr. Sebastian Heeg

Titel

Dr.

Fakultät

Mathematisch-Naturwissenschaftliche Fakultät

Institut

Institut für Physik

Arbeitsgruppe

NWG Physik niedrigdimensionaler Systeme

E-Mail

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HU-FIS-Profil

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Zuletzt gescrapt

28.6.2026, 01:06:27

• Carbin für Optoelektronik und Optomechanik

  Quelle ↗

  Förderer: DFG Nachwuchsgruppe Zeitraum: 03/2021 - 02/2027 Projektleitung: Dr. Sebastian Heeg

• ESB: IPF Nonlinearities in carbyne

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  Förderer: ESB: International Postdoctoral Fellow Zeitraum: 11/2023 - 02/2027 Projektleitung: Dr. Sebastian Heeg

• Forum Junge Spitzenforschung „Sensoren und Datenanalyse im praktischen Einsatz“

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  Förderer: Andere inländische Stiftungen Zeitraum: 11/2023 - 02/2027 Projektleitung: Dr. Sebastian Heeg

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• Minimizing residues and strain in 2D materials transferred from PDMS

  2018

  Repository for Publications and Research Data (ETH Zurich) · 174 Zitationen · DOI

  Integrating layered two-dimensional (2D) materials into 3D heterostructures offers opportunities for novel material functionalities and applications in electronics and photonics. In order to build the highest quality heterostructures, it is crucial to preserve the cleanliness and morphology of 2D material surfaces that come in contact with polymers such as PDMS during transfer. Here we report that substantial residues and up to ~0.22% compressive strain can be present in monolayer MoS2 transferred using PDMS. We show that a UV-ozone pre-cleaning of the PDMS surface before exfoliation significantly reduces organic residues on transferred MoS2 flakes. An additional 200 ◦C vacuum anneal after transfer efficiently removes interfacial bubbles and wrinkles as well as accumulated strain, thereby restoring the surface morphology of transferred flakes to their native state. Our recipe is important for building clean heterostructures of 2D materials and increasing the reproducibility and reliability of devices based on them.

• Polarized Plasmonic Enhancement by Au Nanostructures Probed through Raman Scattering of Suspended Graphene

  2012

  Nano Letters · 159 Zitationen · DOI

  We characterize plasmonic enhancement in a hotspot between two Au nanodisks using Raman scattering of graphene. Single layer graphene is suspended across the dimer cavity and provides an ideal two-dimensional test material for the local near-field distribution. We detect a Raman enhancement of the order of 10(3) originating from the cavity. Spatially resolved Raman measurements reveal a near-field localization one order of magnitude smaller than the wavelength of the excitation, which can be turned off by rotating the polarization of the excitation. The suspended graphene is under tensile strain. The resulting phonon mode softening allows for a clear identification of the enhanced signal compared to unperturbed graphene.

• Evaluating arbitrary strain configurations and doping in graphene with Raman spectroscopy

  2017

  2D Materials · 140 Zitationen · DOI

  The properties of graphene depend sensitively on strain and doping affecting its behavior in devices and allowing an advanced tailoring of this material. A knowledge of the strain configuration, i.e. the relative magnitude of the components of the strain tensor, is particularly crucial, because it governs effects like band-gap opening, pseudo-magnetic fields, and induced superconductivity. It also enters critically in the analysis of the doping level. We propose a method for evaluating unknown strain configurations and simultaneous doping in graphene using Raman spectroscopy. In our analysis we first extract the bare peak shift of the G and 2D modes by eliminating their splitting due to shear strain. The shifts from hydrostatic strain and doping are separated by a correlation analysis of the 2D and G frequencies, where we find $\Delta \omega_{\rm 2D}/\Delta \omega_{\rm G} = 2.21 \pm 0.05$ for pure hydrostatic strain. We obtain the local hydrostatic strain, shear strain and doping without any assumption on the strain configuration prior to the analysis, as we demonstrate for two model cases: Graphene under uniaxial stress and graphene suspended on nanostructures that induce strain. Raman scattering with circular corotating polarization is ideal for analyzing frequency shifts, especially for weak strain when the peak splitting by shear strain cannot be resolved.

• Freie Universität Berlin

  SFB 1772/1: Nanoskalige optische Abbildung und Spektroskopie von mol2Dmat-Heterostrukturen (TP B02)

  university