Superconductivity
Superconductivity combines macroscopic quantum behavior, electronic correlations, phase coherence, and some of the most interesting unresolved questions in condensed matter physics.
Explore superconductivity →Condensed Matter • Quantum Materials • Experimental Physics
Physics & Research
Physics is where my interest in fabrication began. Before a device becomes a process flow, it starts with a physical question: how electrons move, how materials organize, how superconductivity emerges, or how a system responds to temperature and magnetic field. This page is where I collect concepts, experiments, and research topics that I have studied or simply find fascinating.
The Bigger Picture
From physical questions to experimental devices
Condensed matter physics sits at an interesting intersection between fundamental science and technology. Questions about electronic structure, magnetism, superconductivity, disorder, phase transitions, and quantum behavior can eventually lead to materials and devices with entirely new functionality.
Experimental physics adds another layer: understanding a phenomenon often requires growing the material, fabricating a device, designing the measurement, and deciding whether the resulting signal really represents the physics being investigated.
That connection between theory, materials, fabrication, and measurement is one of the things I enjoy most about physics.
Research Themes
Topics I keep coming back to
Little–Parks Effect
A beautiful example of quantum interference at a macroscopic scale, where the resistance of a superconducting ring oscillates periodically with applied magnetic flux.
Explore Little–Parks →Electronic Transport
Resistivity, Hall response, magnetoresistance, and nonlinear transport provide indirect but powerful ways to understand the electronic structure and scattering processes inside a material.
Quantum Materials
Correlated electrons, unconventional superconductivity, layered materials, and emergent phases are recurring themes in the systems I enjoy reading and thinking about.
Superconductivity
More than zero resistance
Superconductivity is often introduced through its most striking property: electrical resistance disappears below a critical temperature. But the phenomenon is much richer than simply perfect conductivity.
The superconducting state is characterized by phase coherence, magnetic-field expulsion, flux quantization, and collective quantum behavior. These properties make superconductors a particularly interesting platform for asking how microscopic electronic interactions produce macroscopic quantum states.
In unconventional superconductors, the problem becomes even more interesting because the mechanism responsible for pairing may not follow the simple picture developed for conventional superconductors.
Why cuprates remain interesting
High-temperature cuprate superconductors exhibit a complicated phase diagram in which superconductivity appears alongside strongly correlated electronic behavior.
Understanding how charge carriers evolve across that phase diagram remains closely connected to broader questions about electronic correlations and the origin of superconductivity.
Quantum Interference
The Little–Parks experiment
The Little–Parks effect is one of my favorite examples of how quantum mechanics becomes visible at a device scale.
In a superconducting ring, the phase of the superconducting order parameter must remain consistent around the closed loop. The resulting flux quantization condition produces periodic changes in the superconducting state as magnetic flux threads the ring.
Experimentally, these changes can appear as oscillations in resistance near the superconducting transition.
Electronic Transport
The Hall effect as a probe of electronic behavior
When a current-carrying material is placed in a magnetic field, charge carriers experience a transverse force that produces a Hall voltage. In a simple single-carrier metal, the Hall coefficient can be directly related to the carrier density and carrier sign.
Real materials can be much more complicated. Multiple bands, temperature-dependent scattering, reconstruction of the electronic structure, and interaction effects can all influence the measured Hall response.
That complexity is exactly what makes transport interesting: deviations from the simplest expectation can contain information about the underlying electronic system.
Simple measurement, complicated interpretation
Measuring a transverse voltage is experimentally straightforward in principle. Interpreting what that voltage means can be much more subtle.
Geometry, contact alignment, longitudinal-voltage mixing, magnetic-field antisymmetrization, multiple carriers, and nonlinear field dependence all become important when moving beyond the simplest Hall-effect model.
Experimental Physics
Physics becomes real when you have to measure it
Experimental physics is not simply the verification of theoretical predictions. Often the experiment itself determines what questions can realistically be answered.
Samples have defects. Contacts introduce resistance. Instruments have noise floors. Temperature requires time to stabilize. Magnetic fields have history. Fabrication changes the material. Every measurement therefore contains both the physics of interest and the realities of the experimental system.
Learning to separate those two is one of the most important skills in experimental research.
Understand the instrument
A measurement is easier to interpret when you understand how the instrument actually generates the reported quantity.
Know the measurement limit
Every experiment has finite resolution, noise, calibration uncertainty, and a range over which the measurement remains meaningful.
Look for artifacts
A surprising signal is interesting, but before assigning new physics to it, experimental artifacts need to be ruled out.
Reproduce the result
Repeatability across samples, measurements, or experimental conditions is often what separates a real phenomenon from an accidental observation.
Experimental Tools
Instruments as extensions of the experiment
PPMS
Cryogenic measurement systems make it possible to study resistance, Hall response, magnetoresistance, susceptibility, and other material properties as functions of temperature and magnetic field.
X-Ray Diffraction
XRD connects diffraction to crystal structure, providing information about phase, orientation, lattice parameters, and crystalline quality.
Explore XRD →SQUID Magnetometry
SQUID-based measurements use superconducting quantum interference to detect extremely small magnetic signals and are particularly useful for studying magnetic and superconducting materials.
Nanofabrication
In device-based experiments, fabrication determines the geometry through which the physical system is interrogated. Lithography and pattern transfer therefore become experimental tools themselves.
Explore nanofabrication →More Physics
Other topics I have explored
Twisted Bilayer Graphene
Moiré structures provide a remarkable example of how geometry and electronic structure can combine to create new correlated states.
Read more →Hubbard Model
One of the foundational models for thinking about interacting electrons, competition between kinetic energy and Coulomb repulsion, and correlated electronic phases.
Read more →High-Temperature Superconductors
Cuprates remain one of the central materials families in the study of unconventional superconductivity and strongly correlated electrons.
Read more →Experimental Techniques
A broader collection of tools and ideas used to grow, fabricate, measure, and understand materials in experimental condensed matter physics.
Explore techniques →From Physics to Devices
Physics is the thread connecting the rest of this site
My interests in nanofabrication, thin-film growth, semiconductor processing, and characterization all grew from the same underlying curiosity: understanding how materials behave and how physical ideas can be turned into experiments and devices.