Homepage of the 2nd Institute of Physics, RWTH Aachen - Experiments and instructions

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Experiments and Instructions

  • Every group completes seven days of experiments (experiment days ED).
  • Single day experiments (M2, M3, M6, M7):
    These will take place on Wednesday during term time.
  • Two-day experiments (M1, M4, M5):
    The first day will be a Wednesday during term time; the second day will take place within one week (latest on the following Tuesday), in accordance with the tutor.
  • Depending on the number of participants, some dates might be during the semester break.
  • Single day lab experiments in Aachen (Lxx):
    Each group 1 ED: The date for the experiment has to be aranged with the tutor. A Wednesday during the term is preferred.
  • Single day lab experiments in Jülich:
    Depending on the number of participants, each group will conduct 1-2 days: The experiments take place as part of the JARA-FIT Ferienpraktikums "Nanoelektronik" in the week 23.03.2020 - 30.03.2020 in Jülich. All participants have to take part in the full-day introduction lecture on 23.03.2020.
  • The e-mail addresses of the tutors can be found by clicking the respective link.
  • Most student labs are in the Modulbau (MB) next to the physics hall in front of tower 26. The laboratory experiments take place in the Physikzentrum.

Overview: Experiments

Experiments (Solid state physics)

M1 Atomic (magnetic) force microscopy (AFM/MFM) (2 days)
Room: MB 007, Details / Instructions

Download:
icon fr Acrobat pdf Instructions
Paper Templates

Please note that the protocol has the be written as a publication in the APS style (5 to 7 pages long). Download the file "Paper Templates". Open the file "scientificwriting.pdf" and read it carefully before the experiment day. The content of "scientificwriting.pdf" will be part of the discussion prior the experiment.

M2 Quantum Transport
Room: MB 009, Details / Instructions
M3 Superconductivity and SQUID
Room: MB 012, Details / Instructions

Download:
icon fr Acrobat pdf Anleitung

M4 Photoluminescence
Room: MB 006, Details / Instructions

Download:
icon fr Acrobat pdf Instructions

M5 Ultrasound (2 days)
Room: MB 009, Details / Instructions

Download:
icon fr Acrobat pdf M5 ultrasound instructions
Paper Templates
Video-Tutorial

Please note that the protocol has the be written as a publication in the APS style (5 to 7 pages long). Download the file "Paper Templates". Open the file "scientificwriting.pdf" and read it carefully before the experiment day. The content of "scientificwriting.pdf" will be part of the discussion prior the experiment.

M6 Microwave experiments
Room: 28 C 104, Details / Instructions
M7 Mass spectrometry
Room: MB 009, Details / Instructions

Download:
icon fr Acrobat pdf M7 mass spectrometry instructions

This lab course experiment teaches the physics and handling of a quadrupole mass spectrometer and the interpretation of mass spectra. In addition the participant should get first-hand experience with ultra-high vacuum technology, which is very important in surface science research.

M8 Fabrication and Characterization of Pseudo-MOSFETs (2 days)
Room: 24C203, Details / Instructions

Download:
icon fr Acrobat pdf M8 PseudoMOSFET
video tutorial

In recent years, microelectronics has undergone an enormous evolution with a steadily increasing performance and complexity of integrated circuits. This has been made possible by modern CMOS technology and in particular the down-scaling of the structural dimensions of the metal-oxide-semiconductor field-effect transistor (MOSFET) devices. However, scaling leads to the appearance of so-called short-channel effects (SCEs) that result in excessive leakage current and thus lead to an increased power consumption. Employing silicon-on-insulator (SOI) with ultrathin silicon thickness, SCEs can effectively be suppressed. The manufacturing process of SOI, however, is rather involved and can result in deteriorated carrier transport properties. Therefore, so-called pseudo-MOSFET are fabricated that facilitate a characterization of the electronic transport after a very short fabrication cycle. Using the silicon handle wafer as a large area back-gate allows manufacturing the pseudo-MOSFETs with only two lithography and etching process steps. Within this two-day experiment students will fabricate and characterize pseudo-MOSFETs. The Experiment starts always on Tuesday, the day before the date given the schedule. The 2nd day is the Wednesday, the date of which is given in the schedule.

Experiments (Laboratory)

L01 Scanning tunneling microscope
Room: , Details / Instructions

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During this laboratory experiment, you will learn about a state of the art scanning tunnelling microscope which is in use in the Morgenstern group. This microscope is used to study the complex electron and spin systems with a high energy resolution and a spatial resolution down to the atomic scale. Currently the electronic and mechanic properties of single layer graphene, low dimensional semiconductor hetereostructures, spin chain systems, magnetic domain structures and phase change materials are under investigation. The exact topic of this experiment will be set by the tutor shortly before the experiment takes place. (For instructions contact the respective tutor)

L02 Mechanical characterization of graphene
Room: 28 A 005, Details / Instructions

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During this laboratory experiment, you will fabricate freely suspended graphene devices. After this, the mechanical properties of the device will be characterized using an atomic force microscope (AFM), which has a special mode called the “peak force tapping” mode. This allows one to locally push on the suspended drum and extract the force-deflection curves. From these force-deflection curves, you can determine the mechanical properties (tension, Young’s modulus) of the graphene. After completing the experiment you should be able to fabricate suspended graphene drums using exfoliation techniques, use peak force tapping mode in the AFM, and apply mechanical models to analyse your data.

L04 Spin coherence in 2D semiconductors
Room: 28 A 312, Details / Instructions

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In this laboratory experiment you learn about time resolved optical measurement techniques for the injection and detection of coherent spin states in 2D semiconductors such as WSe2. The investigation of spin coherence and dephasing properties is of special interest in the research areas of spin electronic and spin quantum information. (For instructions contact the respective tutor)

L05 Raman characterization of CVD grown graphene and 2D material based heterostructures
Room: , Details / Instructions

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Chemical vapor deposition (CVD) of graphene and other 2D materials offers scalability for industrial applications. An ongoing research topic is still how to bring graphene of the highest quality to industry. Using the fast and non-invasive optical technique of Raman spectroscopy to investigate and quantify the different steps of the fabrication process, we will look into such questions as: How does CVD grown graphene look directly after growth compared with being encapsulated in a thin layer of hBN? What is the difference between exfoliated and CVD grown graphene? What physical quantities, such as nanometer-scale strain or doping, change for the graphene depending on what substrate it is placed?

L08 Micro- and nano-lithography
Room: 28 A 314, Details / Instructions

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In this laboratory experiment you will learn about optical lithography and the scanning electron microscope (SEM) of the 2nd Institute of Physics. Using optical lithography, you will make electrical contacts for nano structures. In the second part of the experiment, you will use the SEM to look at biological samples and learn about the usage of the SEM. (For instructions contact the respective tutor)

L10 Microwave readout of a SQUID
Room: 28 C 106, Details / Instructions

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In this experiment, you will use the techniques from experiment M6(Hochfrequenzmesstechnik) to characterize a SQUID (highly sensitive magnetic field detector) with microwave readout at 4 K. You will first measure the resonance curve of the device and its dependence on the magnetic flux to be sensed. By measuring the dependence on the microwave excitation power, you will then study nonlinear effects in the device and how they can be utilized to achieve optimum sensitivity. You will learn about modern microwave and cryogenic experimental techniques. You should complete experiment M6 before this one. (Anleitung beim Betreuer)

L12 Electron spin qubits
Room: 28 C 106, Details / Instructions

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Single electron spins confined to semiconductor quantum dots are used to define a quantum bit. In this experiment you learn about one aspect of these complex experiments e.g. testing the quantum chips at cryogenic temperatures or use radio-frequency driven single electron transistors as single electron charge meters. Ask the tutor for literature at least 1 week prior to the experiment.

 

Phone

Our staff can be reached via phone

from inside the RWTH: use the listed 5-digit direct dial
from Aachen use a prefix: 80-(direct dial)
from Germany use a prefix: 0241-80-(direct dial)
from outside Germany use a prefix: +49-241-80-(direct dial)