Hanchul Kim

Toshiro Takabatake2
Myung-Hwa Jung2
Kyujoon Lee2
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We present an algorithm to reduce the computational complexity for plane-wave codes used in electronic structure calculations. Our proposed algorithm avoids the diagonalization of large Hermitian matrices arising in such problems. The computational time for the diagonalization procedure typically grows as the cube of the number of atoms, or the number of(More)
Predicting the electronic structure of complex systems is an outstanding problem in materials science. If the electronic structure of a given material is known, then many physical and chemical properties can be accurately determined without resorting to experiment. At present, the optical and structural properties of simple solid phases can be predicted(More)
There are many interests to achieve long-range magnetic order in topological insulators of Bi2Se3 or Bi2Te3 by doping magnetic transition metals such as Fe and Mn. The transition metals act as not only magnetic dopants but also electric dopants because they are usually divalent. However, if the doping elements are rare-earth metals such as Gd, which are(More)
The recently developed spin-dependent pseudopotentials markedly improve the description of the energetics of isolated transition metal atoms ͓S.dependent pseudopotentials are obtained from a combination of spin-neutral and fully polarized atomic pseudo-potentials, employing the self-consistent local spin polarization to adapt to different environments.(More)
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