TY - JOUR
T1 - Bogoliubov excitations in a Kronig-Penney potential
AU - Danshita, Ippei
AU - Kurihara, Susumu
AU - Tsuchiya, Shunji
PY - 2005/11
Y1 - 2005/11
N2 - With use of the Kronig-Penney model, we study the excitation spectrum of a Bose-Einstein condensate in a one-dimensional periodic potential. We solve the Bogoliubov equations analytically and obtain the band structure of the excitation spectrum for arbitrary values of the lattice depth. We find that the excitation spectrum is gapless and linear at low energies, and that it is due to the anomalous tunneling of low-energy excitations, predicted by Kagan
AB - With use of the Kronig-Penney model, we study the excitation spectrum of a Bose-Einstein condensate in a one-dimensional periodic potential. We solve the Bogoliubov equations analytically and obtain the band structure of the excitation spectrum for arbitrary values of the lattice depth. We find that the excitation spectrum is gapless and linear at low energies, and that it is due to the anomalous tunneling of low-energy excitations, predicted by Kagan
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U2 - 10.1103/PhysRevA.72.053611
DO - 10.1103/PhysRevA.72.053611
M3 - Article
AN - SCOPUS:28844503854
SN - 1050-2947
VL - 72
JO - Physical Review A - Atomic, Molecular, and Optical Physics
JF - Physical Review A - Atomic, Molecular, and Optical Physics
IS - 5
M1 - 053611
ER -