Competition between local disordering and global ordering fields in nematic liquid crystals

Matej Cvetko (Avtor), Milan Ambrožič (Avtor), Samo Kralj (Avtor)

Povzetek

We study the influence of external electric or magnetic field B on orientational ordering of nematic liquid crystals or of other rod-like objects (e.g. nanotubes immersed in a liquid) in the presence of random anisotropy field type of disorder. The Lebwohl-Lasher lattice type of semi-microscopic approach is used at zero temperature. Therefore, results are valid well below the transition into the isotropic phase. We calculate the correlation function of systems as a function of B, concentration p of impurities imposing random anisotropy field disorder, the disorder strength W and system dimensionality (2D and 3D systems). In order to probe memory effects we calculate correlation length ▫$\xi$▫ for random and homogeneous initial configurations. We determine the crossover fields Bc(p) separating roughly the ordered and disordered regime. Memory effects are apparent only in the latter case, i.e. for B < Bc.

Ključne besede

tekoči kristali;spomin;nered;liquid crystals;memory effect;disorder;

Podatki

Jezik:	Angleški jezik
Leto izida:	2010
Tipologija:	1.01 - Izvirni znanstveni članek
Organizacija:	UM FNM - Fakulteta za naravoslovje in matematiko
UDK:	620.1/.2
COBISS:	17410312
ISSN:	Y506-6603
Št. ogledov:	1895
Št. prenosov:	357
Ocena:	0 (0 glasov)
Metapodatki:

Ostali podatki

Sekundarni jezik:	Slovenski jezik
Sekundarne ključne besede:	nered;teorem Imry-Ma;tekoči kristali;spomin;orientacijski red;
URN:	URN:SI:UM:
Vrsta dela (COBISS):	Znanstveno delo
Strani:	str. 1-14
Letnik:	ǂVol. ǂ6
Zvezek:	ǂno. ǂ2
Čas izdaje:	2010
DOI:	10.3762/bjoc.6.2
ID:	8723831