Collective excitations in quantum Hall liquid crystals : Single-mode approximation calculations

Content Provider	Semantic Scholar
Author	Lapilli, Cintia Wexler, Carlos
Copyright Year	2006
Abstract	A variety of recent experiments probing the low-temperature transport properties of quantum Hall systems have suggested an interpretation in terms of liquid crystalline mesophases dubbed quantum Hall liquid crystals. The single mode approximation SMA has been a useful tool for the determination of the excitation spectra of various systems such as phonons in He and in the fractional quantum Hall effect. In this paper we calculate via the SMA the spectrum of collective excitations in a quantum Hall liquid crystal by considering nematic, tetratic, and hexatic generalizations of Laughlin’s trial wave function having twofold, fourfold, and sixfold broken rotational symmetry, respectively. In the limit of zero wave vector q the dispersion of these modes is singular, with a gap that is dependent on the direction along which q=0 is approached for nematic and tetratic liquid crystalline states, but remains regular in the hexatic state, as permitted by the fourth order wave-vector dependence of the projected oscillator strength and static structure factor.
File Format	PDF HTM / HTML
Alternate Webpage(s)	https://mospace.umsystem.edu/xmlui/bitstream/handle/10355/7238/CollectiveExcitationsQuantumHall.pdf?isAllowed=y&sequence=1
Alternate Webpage(s)	http://web.missouri.edu/~wexlerc/Preprints/prb73-085314-sma.pdf
Language	English
Access Restriction	Open
Subject Keyword	Approximation Arabic numeral 0 Excitation Experiment Fractional quantum Hall effect Generalization (Psychology) Laughlin wavefunction Liquid Crystals Oscillator Device Component Phonon Projections and Predictions Quasiparticle Singular Spinal Muscular Atrophy
Content Type	Text
Resource Type	Article