Radiation damping optical enhancement in cold atoms

Wu, Jin-Hui; Horsley, S. A. R.; Artoni, M.; Rocca, G. C. La

doi:10.1038/lsa.2013.10

Cited by 16 publications

(7 citation statements)

References 36 publications

(52 reference statements)

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“…(1), can be achieved and made completely reversible in two opposite directions. The underlying physical mechanism is illustrated by considering a lattice of driven cold atoms [25][26][27][28][29] whose probe susceptibility is such that χ p ðzÞ ¼ −χ Ã p ð−zÞ with loss and no gain, which is clearly not a PT-symmetric case [30,31]. We engineer a far-detuned dressing field so as to induce a spatially modulated frequency shift along the lattice axis in quadrature with respect to the atomic density (see Fig.…”

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confidence: 99%

Non-Hermitian Degeneracies and Unidirectional Reflectionless Atomic Lattices

2014

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Light propagation in optical lattices of driven cold atoms exhibits non-Hermitian degeneracies when the first-order modulation amplitudes of real and imaginary parts of the probe susceptibility are manipulated to be balanced. At these degeneracies, one may observe complete unidirectional reflectionless light propagation. This strictly occurs with no gain and can be easily tuned and fully reversed as supported by the transfer-matrix calculations and explained via a coupled-mode analysis. DOI: 10.1103/PhysRevLett.113.123004 PACS numbers: 37.10.Jk, 11.30.Er, 42.25.Bs, 42.50.Gy Much attention has been devoted to the development of artificial metamaterials for achieving optical functionalities not available in nature. Photonic crystals [1] and lefthanded materials [2] are prominent instances tailored to stretch the rules of light propagation and interaction. Such metamaterials have seeded new paradigms in optical, optoelectronic, and optomechanical devices [3][4][5][6]. Nevertheless, some tasks are more difficult than others with unidirectional light transport being a most pronounced example. Significant progress has been made in recent years by developing optical materials with parity-time (PT) symmetry to attain unidirectional light invisibility [7][8][9][10][11][12][13][14][15][16]. PT-symmetric metamaterials require a delicate balance of gain and loss whereby the complex refraction index satisfies nðzÞ ¼ n Ã ð−zÞ and are typically made of periodic solid microstructures. Homogeneous atomic vapors driven into three-level [17,18] or four-level [19] configurations have also been proposed to realize PT-symmetric optical potentials via rather complicated spatial modulations of two driving fields. Such proposals have obvious advantages of real-time all-optical reconfigurable capabilities and implicit disadvantages of intractable field modulations and considerable symmetry errors. Large optical nonreciprocities may also be achieved by exploiting the asymmetric Doppler shift in moving atomic Bragg mirrors [20], and proofof-principle experiments have been carried out [21].The great interest in PT-symmetric complex media stemmed, however, from the non-Hermitian extensions of quantum mechanics and quantum field theories [22,23], and it is perhaps worth going back to the essential nonHermitian behavior of light transport to get a broader picture on reciprocity violations and unidirectional reflectionlessness. Take, e.g., a typical one-dimensional (1D) light scattering process as shown in Fig. 1(a) where the outgoing field amplitudes fE − L ; E þ R g are related to the incoming field amplitudes fE − R ; E þ L g by a scattering matrix S [24], the eigenvectors of which are defined byThe complex amplitudes t, r L , and r R of the (S) matrix in Eq.(1) denote, as usual, the reciprocal transmission and the reflection for incidence from the left and from the right. In general, the matrix S is non-Hermitian, its eigenvalues λ AE s ¼ t AE ffiffiffiffiffiffiffiffiffi ffi r L r R p are complex, and its eigenvectors ðAE ffiffiffiffiff...

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Non-Hermitian Degeneracies and Unidirectional Reflectionless Atomic Lattices

2014

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“…Although these phenomena could be observed in systems where Bloch oscillations have been realized, such as optically excited semiconductor superlattices [10][11][12]44] (see the review by Lyssenko & Leo [45]) and coupled optical waveguides [46,47], quantum gases in optical lattices realize practicable artificial solids with a higher degree of control and manipulation. They have, in fact, become a powerful experimental platform to explore matter waves' many-body interactions [1,2], matter waves' singular dynamics including electric quantum walks [48,49], super [6] and anomalous [50] Bloch oscillations as well as light-matter waves' interactions in stationary [43,[51][52][53][54][55][56][57][58] and moving [59][60][61][62] ordered atomic structures trapped in an optical lattice. Within this context, it is worth mentioning the recent work [63] on cold rubidium atoms trapped in an optical lattice and subject to external lasers that impart a circular motion to them, analogous to the motion of electrons in a strong magnetic field, with which self-similar fractal structures of the spectra (Hofstadter bands) are expected to be seen.…”

Section: Resultsmentioning

confidence: 99%

Quasi-periodic Wannier–Stark ladders from driven atomic Bloch oscillations

2014

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Periodic Wannier-Stark ladder structures of the energy resonances associated with Bloch oscillations can be readily modified into quasi-periodic ones that exhibit peculiar self-similar effects. A compact theoretical description of the dynamics of driven Bloch oscillations is developed here within the quasimomentum representation. We identify a rather viable scheme based on ultracold atomic wavepackets subject to gravity in a driven optical lattice potential where a self-similar scaling could be observed. Its feasibility in terms of realistic experimental parameters is also discussed.

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“…We start from a Λ-type electromagnetically induced transparency (EIT) system [24,[30][31][32][33], as depicted in Fig. 1(a).…”

Section: The Modelmentioning

confidence: 99%

Modulation of the photonic band structure topology of a honeycomb lattice in an atomic vapor

et al. 2015

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In an atomic vapor, a honeycomb lattice can be constructed by utilizing the three-beam interference method. In the method, the interference of the three beams splits the dressed energy level periodically, forming a periodic refractive index modulation with the honeycomb profile. The energy band topology of the honeycomb lattice can be modulated by frequency detunings, thereby affecting the appearance (and disappearance) of Dirac points and cones in the momentum space. This effect can be usefully exploited for the generation and manipulation of topological insulators.

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Radiation damping optical enhancement in cold atoms

Cited by 16 publications

References 36 publications

Non-Hermitian Degeneracies and Unidirectional Reflectionless Atomic Lattices

Non-Hermitian Degeneracies and Unidirectional Reflectionless Atomic Lattices

Quasi-periodic Wannier–Stark ladders from driven atomic Bloch oscillations

Modulation of the photonic band structure topology of a honeycomb lattice in an atomic vapor

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