Halbleiter-Nanostrukturen und -Quantensysteme

Prof. Jonathan Finley

Forschungsgebiet

Our group explores a wide range of topics related to the fundamental physics of nanostructured materials and their quantum-electronic and -photonic properties. We study the unique electronic, photonic and quantum properties of materials patterned over nanometer lengthscales and explore how sub-components can be integrated together to realise entirely new materials with emergent properties. This convergence of materials-nanotechnology, quantum electronics and photonics is strongly interdisciplinary, spanning topics across the physical sciences, as well as materials science and engineering.

Adresse/Kontakt

Am Coulombwall 4/I
85748 Garching b. München
+49 89 289 12771
Fax: +49 89 289 12704

Mitarbeiterinnen und Mitarbeiter der Arbeitsgruppe

Professorinnen und Professoren

Mitarbeiterinnen und Mitarbeiter

Lehrangebot der Arbeitsgruppe

Lehrveranstaltungen mit Beteiligung der Arbeitsgruppe

Titel und Modulzuordnung
ArtSWSDozent(en)Termine
Applied Quantum Mechanics
Zuordnung zu Modulen:
VO 2 Reinhard, F. Di, 10:00–12:00, WSI 101S
Experimentalphysik 3 in englischer Sprache
Zuordnung zu Modulen:
VO 2 Finley, J. Mo, 14:00–16:00, PH HS1
Nanofabrication and Nanoanalytics
Zuordnung zu Modulen:
VO 2 Koblmüller, G. Di, 09:30–11:00, ZEI 0001
Optics of Semiconductors and their Nanostructures
Zuordnung zu Modulen:
VO 2 Finley, J.
Mitwirkende: Müller, K.
Di, 14:15–16:00, WSI 101S
Photonische Quantentechnologien
Zuordnung zu Modulen:
VO 2 Kaniber, M. Do, 08:30–10:00, ZNN 0.001
Aktuelle Themen der integrierten Quanten-Photonik
Zuordnung zu Modulen:
HS 2 Kaniber, M.
Leitung/Koordination: Finley, J.
Mo, 08:30–10:00, WSI 101S
Aktuelle Themen in nanostrukturierten Materialien
Zuordnung zu Modulen:
PS 1 Finley, J. Mo, 13:15–14:00, WSI 101S
Quantenphotonische und elektronische Bauelemente
Zuordnung zu Modulen:
HS 2 Finley, J.
Mitwirkende: Müller, K.
Do, 10:00–11:30, ZNN 0.001
Exercise to Nanofabrication and Nanoanalytics
Zuordnung zu Modulen:
UE 1
Leitung/Koordination: Koblmüller, G.
Di, 11:00–11:45, ZEI 0001
Exercise to Semiconductor Nanofabrication and Nano-analytical Methods
Zuordnung zu Modulen:
UE 1 Koblmüller, G.
Übung zu Optische Eigenschaften von Halbleitern und deren Nanostrukturen
Zuordnung zu Modulen:
UE 1 Müller, K.
Leitung/Koordination: Finley, J.
Übung zu Photonische Quantentechnologien
Zuordnung zu Modulen:
UE 1 Kaniber, M.
FOPRA-Versuch 01: Ballistischer Transport (Flippern mit Elektronen)
Zuordnung zu Modulen:
PR 1 Finley, J.
Mitwirkende: Koblmüller, G.
FOPRA-Versuch 14: Optische Absorption
Zuordnung zu Modulen:
PR 1 Finley, J.
Mitwirkende: Müller, K.
FOPRA-Versuch 24: Feldeffekt-Transistor (MOSFET)
Zuordnung zu Modulen:
PR 1 Finley, J.
Mitwirkende: Kaniber, M.
FOPRA-Versuch 45: Optische Eigenschaften von Halbleiter-Quantenfilmen
Zuordnung zu Modulen:
PR 1 Finley, J.
Mitwirkende: Simmet, T.
Munich Physics Colloquium
Zuordnung zu Modulen:
KO 2 Finley, J. Krischer, K. Mo, 17:15–19:00
Mo, 17:15–19:00, PH HS2
sowie einzelne oder verschobene Termine
sowie Termine in Gruppen

Ausgeschriebene Angebote für Abschlussarbeiten an der Arbeitsgruppe

Attaching wires to doped GaAs-AlGaAs core-multishell nanowire lasers

Semiconductor nanowires (NW) are rapidly emerging as a new generation of miniaturized on-chip coherent light sources by virtue of their unique geometry. In particular, due to the natural Fabry-Perot resonators formed by guided modes between the NW-endfacets, combined with the possibilities for direct monolithic integration on Si, NW lasers offer attractive applications in future optical interconnects and data communication.

Until now these NW lasers are driven optically, an electrical operation of the device is crucial for all applications. For this purpose, electrical contacts and a precise control of the doping profile in the device is required. The aim of this maswters thesis project is to develop appropriate process technologies to contact doped core-multishell NWs in a lying and standing geometry. This enables the characterization of the devices with respect to their electrical properties. Moreover, a comprehensive 2D-3D TCAD model of the NW laser will be implemented to simulate the electrothermal performance of the device. Adjusting the simulations to the measurement results enables the optimization of the doping profile and the heterostructure design of the NW laser. Experience in the area of clean room fabrication or TCAD modeling is a benefit, but secondary to motivation, commitment and a willingness to work as part of a team.

Applications should be sent to Prof. Finley (finley@wsi.tum.de)with c.c. to Jochen Bissinger (Jochen.Bissinger@wsi.tum.de). Please include a brief CV, a copy of your Bachelor Thesis and a transcript of your grades.

geeignet als
  • Masterarbeit Physik der kondensierten Materie
  • Masterarbeit Applied and Engineering Physics
Themensteller(in): Jonathan Finley
Development of InGaAs-based nanowire lasers for Si photonics

At the Walter Schottky Institut we have recently gained great expertise in exploring nanowire (NW) lasers as the smallest possible semiconductor-based coherent light sources. One of their most promising features is that they can be also integrated onto silicon (Si) platform and thereby provide a nanoscale source for potential operation in Si photonic circuits.

An important step forward towards integration into Si photonic circuits is to control the emission wavelength of the nanowire laser in the technologically relevant spectral range of 1.3 – 1.55 um. For this reason it is necessary to develop new active gain materials in III-V based nanowire lasers, such as InGaAs multi-quantum well structures inside NW Fabry-Perot resonator cavities, and integrate these onto Si-based ridge waveguides.

The aim of this project is to develop long-wavelength InGaAs-based quantum wells incorporated in GaAs-based resonator cavities using sophisticated nanofabrication and characterization methodologies. Interacting closely with a PhD student you will be designing and synthesizing these laser structures using molecular beam epitaxy, and then characterizing their laser metrics by confocal micro-photoluminescence spectroscopy (uPL). The design and characterization may also be supported by state-of-the-art simulations of the laser gain spectrum and optical waveguiding properties. Ultimately, the InGaAs-based NW lasers should be integrated directly onto Si-ridge waveguides. Here, you will be actively exploiting various semiconductor processing techniques to fabricate the desired templates for direct monolithic integration. The coupling and lasing mode propagation between NW laser and Si waveguide will then be investigated by two-axis uPL experiments.

In this thesis, you will be closely working with several other student members in the Nanowire Group at WSI, led by PD. Dr. Gregor Koblmueller. Experience in the area of clean room fabrication or optical spectroscopy is a benefit, but secondary to motivation and commitment. Applications should be sent to Gregor.Koblmueller@wsi.tum.de or Jochen.Bissinger@wsi.tum.de. Please include your CV, a copy of your Bachelor Thesis and a transcript of your grades (Bachelor & Master).

geeignet als
  • Masterarbeit Physik der kondensierten Materie
  • Masterarbeit Applied and Engineering Physics
Themensteller(in): Gregor Koblmüller
Imaging of Neural Action Potentials by Quantum Sensors and/or Deep Learning

Our young lab is using solid state qubits to build sensors, e.g. for magnetic fields. We aim to apply them to various applications, with a particular focus on life sciences.

Most of our projects focus on microscopy methods based on magnetic resonance spectroscopy of small (sub-µm) samples.

We are seeking a MSc student to study a novel application, imaging of electric action potentials of neurons, the cells performing computation in the brain. This should involve the development of a new type of sensor, based on solid state quantum materials, smart signal processing by artificial neural networks, or a combination of both.

Techniques:

* You will learn to prepare microscopy samples of both solid state samples and cell cultures. 

* You will design an experiment to detect the weak optical signals from these samples in one of our existing microscope setups. This will involve development of advanced optics and control software.  

Depending on preference and success of the initial steps you will either

* Study fluoresent quantum materials like red fluorescent diamond and their response to external electric fields. 

* Develop signal processing protocols to enhance these signals in existing devices 

 

geeignet als
  • Masterarbeit Physik der kondensierten Materie
  • Masterarbeit Kern-, Teilchen- und Astrophysik
  • Masterarbeit Biophysik
  • Masterarbeit Applied and Engineering Physics
Themensteller(in): Friedemann Reinhard
Nuclear Magnetic Resonance Microscopy

Magnetic resonance imaging (NMR/MRI), is one of the most powerful techniques to record three-dimensional images of nearly arbitrary samples. Current standard setups, such as those found in hospitals, cannot record details smaller than 1mm.  

Our group aims to push MRI to a microscopy technique by improving its spatial resolution down to the sub-nm range, the scale of single atoms. This ambitious goal has recently become a realistic prospect by a new generation of quantum sensors for magnetic fields. They are based on the nitrogen-vacancy (NV) color defect in diamond and could detect fields as small as the NMR signal of a single molecule [1,2].

We are looking for a MSc student to develop such a magnetic resonance microscope with a resolution in the intermediate (100nm-1µm) range, higher than any conventional technique, but coarser than most of our other (nm-range) projects. 

Techniques:

* You will learn to fabricate microscale electromagnets in one of our clean rooms, and optimize our fabrication techniques for your project and others. 

* You will design a sensor chip for microscale NMR detection and upgrade software and optics of one of our setups to perform the experiment. 

* You will design, implement and analyze quantum control protocols to record microscale MRI images.

[1] T. Staudacher et al., Science 339, 561 (2013)

[2] H.J. Mamin et al., Science 339, 557 (2013)

 
geeignet als
  • Masterarbeit Physik der kondensierten Materie
  • Masterarbeit Biophysik
  • Masterarbeit Applied and Engineering Physics
Themensteller(in): Friedemann Reinhard

Abgeschlossene und laufende Abschlussarbeiten an der Arbeitsgruppe

Dynamics of spins in self-assembled quantum dots
Abschlussarbeit im Masterstudiengang Physics (Applied and Engineering Physics)
Themensteller(in): Jonathan Finley
Planar Scanning Probes: Development of Optical Far-Field Position Control with Nanometer Resolution
Abschlussarbeit im Masterstudiengang Physik (Physik der kondensierten Materie)
Themensteller(in): Friedemann Reinhard
Silicon Nitride Photonics using 2D Nanomaterial
Abschlussarbeit im Masterstudiengang Physics (Applied and Engineering Physics)
Themensteller(in): Jonathan Finley
Studies on superconducting single photon detectors
Abschlussarbeit im Masterstudiengang Physik (Physik der kondensierten Materie)
Themensteller(in): Jonathan Finley

Kondensierte Materie

Wenn Atome sich zusammen tun, wird es interessant: Grundlagenforschung an Festkörperelementen, Nanostrukturen und neuen Materialien mit überraschenden Eigenschaften treffen auf innovative Anwendungen.