Nonlinear response of interacting bosons in a quasiperiodic potential

Year: 2023

Authors: Dutta D.; Roy A.; Saha K.

Autors Affiliation: Natl Inst Sci Educ & Res, Jatni 752050, Odisha, India; Homi Bhabha Natl Inst, Training Sch Complex, Mumbai 400094, India; Indian Inst Technol Mandi, Sch Phys Sci, Mandi 175075, HP, India; Univ Trento, Pitaevskii BEC Ctr, CNR INO, Via Sommar 14, I-38123 Trento, Italy; Univ Trento, Dipartimento Fis, Via Sommar 14, I-38123 Trento, Italy.

Abstract: We theoretically study the electric pulse-driven nonlinear response of interacting bosons loaded in an optical lattice in the presence of an incommensurate superlattice potential. In the noninteracting limit (U=0), the response of the localized phase differs significantly than the response of the delocalized phases. In particular, we show that the particle current contains only odd harmonics in the delocalized phase in contrast to the localized phase where both even and odd harmonics exist. The relative magnitudes of these even and odd harmonics and the contrast of the peaks can be tuned by varying frequency and the number of cycles of the applied pulse, respectively. In the presence of repulsive interactions, the amplitudes of the even and odd harmonics further depend on the relative strengths of the interaction U and the disorder potential V0. We illustrate that the disorder and interaction-induced phases can be distinguished through the particle current. Finally, we discuss the dynamics of field-induced excitation responsible for exhibiting higher harmonics in the current spectrum.

Journal/Review: PHYSICAL REVIEW B

Volume: 107 (3)      Pages from: 035120-1  to: 035120-13

More Information: K.S. thanks Anamitra Mukherjee for useful discussion. D.D. acknowledges use of Virgo cluster at NISER. A.R. acknowledges the support of the Science and Engineering Research Board (SERB) , Department of Science and Technology, Government of India under the Project No. SRG/2022/000057 and IIT Mandi seed-grant funds under the Project No. IITM/SG/AR/87.
KeyWords: ORDER HARMONIC-GENERATION; ANDERSON LOCALIZATION; ULTRACOLD ATOMS; INSULATOR; TRANSITION; SUPERFLUID; ELECTRONS; 1064-NM; SYSTEM; FIELD
DOI: 10.1103/PhysRevB.107.035120

ImpactFactor: 3.200
Citations: 1
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