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21-WS-Nanophysics

On the nanometer scale many materials exhibit size-dependent electronic, optical, and magnetic properties, which are governed by quantum mechanical effects. In this lecture, we will take the journey from three-dimensional, to two-dimensional, one-dimensional and zero-dimensional objects. Our main focus will lie on the understanding of their electronic properties. We will discuss experimental techniques to explore some of the exciting phenomena occuring in low-dimensional systems and explain the physical concepts.The lecture will proceed along the following chapters:

Chapter 1: Repetition of Basic Solid State Physics
- Band structure: free electron model, tight binding
- Density of states

Chapter 2: Carbon-based materials
- Graphene
- Carbon nanotubes

Chapter 3: Semiconductor physics and device applications
- Repetition of semiconductor physics
- Fundamentals of MOSFET devices
- Novel devices

Chapter 4: 2-dimensional electron systems
- 2D electron gas in electric and magnetic field
- Quantum Hall Effect (Landau levels,..)

Chapter 5: 1-dimensional electron systems – quantum wires
- Ballistic transport
- Landauer formula and scattering theory
- Quantum point contacts (MBJ measurement)

Chapter 6: Quantum interference
- Wave-particle duality
- Aharonov-Bohm effect
- Weak localisation
- Universal conductance fluctuations

Chapter 7: Single electron effects and quantum dots
- Coulomb blockade
- Single electron box and single electron transistor (Coulomb diamonds)
- Quantum dots (fabrication, “artificial atoms”)

Chapter 8: Molecular electronics
- Functions
- Contacting
- First test systems

Chapter 9: Magnetism and magnetotransport in 2-dimensional structures
- Introduction and background
- Interlayer Exchange coupling
- GMR/TMR

Chapter 10: Magnetism in 0-dimension
- Single magnetic atoms
- Kondo effect


Starting dates:

We will start with the first lecture on Monday, 18. October, 10:15 am in room 1.1.16 in Arnimallee 14.

The first excercise class will take place on Friday, 29. October, at 10:15 in room 1.4.03, seminar room T2 in Arnimalle 14.


Lecture and exercises:

The semester is scheduled for in-person meetings in the department. 3G rules apply for entering the building.


Exercises:

The exercises will comprise the discussion of recent literature related to the concepts explained in the lecture.


Formalities:

You need to register for the class via KVV and Campus Management.


Suggested Literature:

The Physics of Low-Dimensional Semiconductors - An Introduction, John H. Davies

Electron Transport in Mesoscopic Systems, Datta

Electron Transport in Nanostructures and Mesoscopic Devices, Thierry Ouisse

Mesoscopic Electronics in Solid State Nanostructures, Thomas Heinzel


Exam:

Oral exams during the last week of semester.