Comment on `Six-state clock model on the square lattice: Fisher zeroapproach with Wang-Landau sampling'

• Hwang in [Phys. Rev. E {\bf{80}}, 042103 (2009)] suggested that the two transitions of the six-state clock model on the square lattice are\emph{not} of the Kosterlitz-Thouless type. Here we show from simulations thatat the upper transition, the helicity modulus does make a discontinuous jumpto zero. This gives strong evidence for a Kosterlitz-Thoulesstransition.

Ämnesord

NATURVETENSKAP  -- Fysik -- Den kondenserade materiens fysik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences -- Condensed Matter Physics (hsv//eng)

Nyckelord

six-state clock model

Kosterlitz-Thouless transition

helicity modulus

Critical phenomena (phase transitions)

Kritiska fenomen (fasövergångar)

teoretisk fysik

Theoretical Physics

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