4 papers
Spectral taxonomy for quartic systems: fundamental clock, parity, and continuum
Teepanis Chachiyo
A symmetric quartic potential is a physics motif with incredibly expansive applications, ranging from broadband energy harvesters, quantum tunneling in molecules and the early univ…
Simple and accurate complete elliptic integrals for the full range of modulus
Teepanis Chachiyo
The complete elliptic integral of the first and second kind, K(k) and E(k), appear in a multitude of physics and engineering applications. Because there is no known closed-form, th…
Universal spectral structure in pendulum-like systems
Teepanis Chachiyo
Pendulum-like dynamics is a universal motif across many areas of physics, underlying systems ranging from classical nonlinear oscillators to superconducting qubits and cold-atom tu…
Understanding electron correlation energy through density functional theory
Teepanis Chachiyo, Hathaithip Chachiyo
A curious behavior of electron correlation energy is explored. Namely, the correlation energy is the energy that tends to drive the system toward that of the uniform electron gas.…