Dr. Sebastian Heeg

Dr. Sebastian Heeg erforscht optische und mechanische Eigenschaften von eindimensionalen Kohlenstoffstrukturen (Carbin) und zweidimensionalen Halbleitermaterialien, insbesondere Übergangsmetal-Dichalkogenide. Sein aktueller Fokus liegt auf der Kontrolle von Exzitonen – Elektron-Loch-Paaren, die Lichtemission bestimmen – durch mechanische Dehnung und Spektroskopie. Die Arbeiten ermöglichen es, optische und elektronische Zustände in Nanomaterialien gezielt zu manipulieren und zu charakterisieren, was für die Entwicklung von Quantenelektronik, optischen Sensoren und Informationsverarbeitung auf Basis von Quanteneigenschaften relevant ist. Seine Methoden kombinieren Raman-Spektroskopie, Nanomechanik und optische Messtechniken zur Untersuchung von Materialien im Nanobereich.

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• NW Emmy Nother Gruppe Carbin für Optoelektronik/Optomechanik

  Quelle ↗

  Förderer: DFG Nachwuchsgruppe Zeitraum: 03/2021 - 10/2025 Projektleitung: Dr. Sebastian Heeg

• ESB: IPF Nonlinearities in carbyne

  Quelle ↗

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

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

  Quelle ↗

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

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

  2018

  Repository for Publications and Research Data (ETH Zurich) · 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 · 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.