TY - JOUR
T1 - Quantum dynamics of an Ising spin chain in a random transverse field
AU - Jia, Xun
AU - Chakravarty, Sudip
PY - 2006
Y1 - 2006
N2 - We consider an Ising spin chain in a random transverse magnetic field and compute the zero temperature wave vector and frequency dependent dynamic structure factor numerically by using Jordan-Wigner transformation. Two types of distributions of magnetic fields are introduced. For a rectangular distribution, a dispersing branch is observed, and disorder tends to broaden the dispersion peak and close the excitation gap. For a binary distribution, a nondispersing branch at almost zero energy is obtained, in addition to a dispersing branch. We discuss the relationship of our work to the neutron scattering measurement in LiHo F4.
AB - We consider an Ising spin chain in a random transverse magnetic field and compute the zero temperature wave vector and frequency dependent dynamic structure factor numerically by using Jordan-Wigner transformation. Two types of distributions of magnetic fields are introduced. For a rectangular distribution, a dispersing branch is observed, and disorder tends to broaden the dispersion peak and close the excitation gap. For a binary distribution, a nondispersing branch at almost zero energy is obtained, in addition to a dispersing branch. We discuss the relationship of our work to the neutron scattering measurement in LiHo F4.
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U2 - 10.1103/PhysRevB.74.172414
DO - 10.1103/PhysRevB.74.172414
M3 - Article
AN - SCOPUS:33845269355
SN - 1098-0121
VL - 74
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 17
M1 - 172414
ER -