Momentum and energy The photoemission process is governed by the photon, described as a plane wave, and the electron. What one sees from the photoemission experiment is the intensity according to ...

Samgeori Park (2026. 06. 13)

Chapter 1. Philosophy and Politics What Russell is trying to say in chapter 1 is that (1) there is no need to ‘always’ endure present unpleasantness for the sake of doubtful future good, (2) one d...

On Death — Annotated Draft ⚠️ A Note on the Essay This is not an essay written from the standpoint of a philosopher with a finished doctrine. I am writing this essay as someone who finds death ...

Starting Point This note asks why scientists do research. There are two answers given: Curiosity and the welfare of human beings. Kaczynski, in his book “Industrial Society and Its Future”, denied...

Quantum geometry tensors are derived by computing the (gauge-invariant) inner product of two quantum states transformed over a parameter space. Quantum distance The quantum distance is defined a...

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Bogoliubov transformation 초전도체에서 두 전자는 Cooper pair를 형성하는데, spin-singlet ($s$-wave or $d$-wave)인 pair에 대해서 mean-field BCS Hamiltonian은 아래와 같다: [\begin{equation} H^{\rm MF}{\rm BCS} = \sum{\mathbf{...

Deploying an app for testing It is recommended to read Managing Signing Hash before reading this document. If one wants to run a Flutter project in release mode or build an APK file for the r...

Sublattice Interference Mechanism Introduction van Hove singularity에서는 density of states가 divergent하고 Fermi surface nesting이 발생할 수 있기 때문에 SDW나 $d$-wave 초전도와 같은 Fermi surface instabilities를 trig...