Zobrazeno 1 - 10
of 38
pro vyhledávání: '"Ramachandran, Ajith"'
Quantum transport of charge or energy in networks with discrete sites is central to diverse quantum technologies, from molecular electronics to light harvesting and quantum opto-mechanical metamaterials. A one dimensional network can be viewed as wav
Externí odkaz:
http://arxiv.org/abs/2402.07454
Publikováno v:
Phys. Rev. B 106, 205119 (2022)
We study the effect of quasiperiodic Aubry-Andr\'e disorder on the energy spectrum and eigenstates of a one-dimensional all-bands-flat (ABF) diamond chain. The ABF diamond chain possesses three dispersionless flat bands with all the eigenstates compa
Externí odkaz:
http://arxiv.org/abs/2205.02859
Autor:
Ramachandran, Ajith, Genkin, Michael, Sharma, Auditya, Eisfeld, Alexander, Wüster, Sebastian, Rost, Jan-Michael
Quantum mechanical scattering involving continuum states coupled to a scatterer with a discrete spectrum gives rise to Fano resonances. Here we consider scatterers that possess internal vibrational degrees of freedom in addition to discrete states. E
Externí odkaz:
http://arxiv.org/abs/2108.03436
Publikováno v:
Phys. Rev. B 103, 155111 (2021)
The Fano-Anderson chain consists of a linear lattice with a discrete side-unit, and exhibits Fano-resonant scattering due to coupling between the discrete states of the side-unit with the tight-binding continuum. We study Fano-resonance-assisted tran
Externí odkaz:
http://arxiv.org/abs/2011.01253
Publikováno v:
Phys. Rev. Research 2, 043395 (2020)
We systematically study the effect of disorder and interactions on a quasi-one dimensional diamond chain possessing flat bands. Disorder localizes all the single particle eigenstates, while at low disorder strengths we obtain weak flat-band based loc
Externí odkaz:
http://arxiv.org/abs/1912.09951
Publikováno v:
Phys. Rev. Research 2, 013175 (2020)
We report the existence of \emph{flat bands} in a p-wave superconducting Kitaev ladder. We identify two sets of parameters for which the Kitaev ladder sustains flat bands. These flat bands are accompanied by highly localized eigenstates known as comp
Externí odkaz:
http://arxiv.org/abs/1911.00300
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Autor:
Xia, Shiqi, Ramachandran, Ajith, Xia, Shiqiang, Li, Denghui, Liu, Xiuying, Tang, Liqin, Hu, Yi, Song, Daohong, Xu, Jingjun, Leykam, Daniel, Flach, Sergej, Chen, Zhigang
Flatband systems typically host "compact localized states"(CLS) due to destructive interference and macroscopic degeneracy of Bloch wave functions associated with a dispersionless energy band. Using a photonic Lieb lattice(LL), we show that conventio
Externí odkaz:
http://arxiv.org/abs/1810.12618
Publikováno v:
Scientific Reports 9, 2862 (2019)
We investigate the optical properties of a photonic crystal composed of a quasi-one-dimensional flat-band lattice array through finite-difference time-domain simulations. The photonic bands contain flat bands (FBs) at specific frequencies, which corr
Externí odkaz:
http://arxiv.org/abs/1801.08671
Linear wave equations on Hamiltonian lattices with translational invariance are characterized by an eigenvalue band structure in reciprocal space. Flat band lattices have at least one of the bands completely dispersionless. Such bands are coined flat
Externí odkaz:
http://arxiv.org/abs/1801.03210