Coulomb Bicrystals of Species with Identical Charge-to-Mass Ratios

Matthey, Thierry; Hansen, J. P.; Drewsen, Michael

doi:10.1103/physrevlett.91.165001

Cited by 31 publications

(16 citation statements)

References 22 publications

(24 reference statements)

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“…However, recent experiments show that even small clouds (N ∼ 10 3 ) can show a bcc or fcc structure [193]. Further experiments investigated structural transitions due to resonant instabilities [205] and Coulomb bicrystals [206,207]. In general, it can be stated that many theoretical predictions [56] for these systems are not yet verified by experiments, e.g.…”

Section: Finite Systemsmentioning

confidence: 99%

Complex plasmas: a laboratory for strong correlations

2010

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Strong correlations-cooperative behavior due to many-particle interactions-are omnipresent in nature. They occur in electrolytic solutions, dense plasmas, ultracold ions and atomic gases in traps, complex (dusty) plasmas, electrons and excitons in quantum dots and the quark-gluon plasma. Correlation effects include the emergence of long-range order, of liquid-like or crystalline structures and collective dynamic properties (collective modes). The observation and experimental analysis of strong correlations are often difficult, requiring, in many cases, extreme conditions such as very low temperatures or high densities. An exception is complex plasmas where strong coupling can be easily achieved, even at room temperature. These systems feature the strongest correlations reported so far and experiments allow for an unprecedented precision and full single-particle resolution of the stationary and time-dependent many-particle behavior. The governing role of the interactions in strongly correlated systems gives rise to many universal properties observed in all of them. This makes the analysis of one particular system interesting for many others. This motivates the goal of this paper which is to give an overview on recent experimental and theoretical results in complex plasmas including liquid-like behavior, crystal formation, structural and dynamic properties. It is expected that many of these effects will be of interest also to researchers in other fields where strong correlations play a prominent role.

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Section: Finite Systemsmentioning

confidence: 99%

Complex plasmas: a laboratory for strong correlations

2010

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“…Cold one-component plasma physics [1] has in the past two decades led to a series of interesting results due to the availability of fast computers [2][3][4][5] as well as the possibility to experiment with ensembles of trapped, lasercooled atomic ions [6][7][8][9][10][11][12][13][14][15][16]. Prominent examples are the understanding of structural properties of crystallized cold plasmas in both Penning [6,7] and Paul [8-10, 15, 16] traps, and the investigation of the normal mode dynamics of cold magnetized plasmas in Penning traps [11][12][13][14].…”

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confidence: 99%

Noninvasive Vibrational Mode Spectroscopy of Ion Coulomb Crystals through Resonant Collective Coupling to an Optical Cavity Field

et al. 2010

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We report on a novel non-invasive method to determine the normal mode frequencies of ion Coulomb crystals in traps based on the resonance enhanced collective coupling between the electronic states of the ions and an optical cavity field at the single photon level. Excitations of the normal modes are observed through a Doppler broadening of the resonance. An excellent agreement with the predictions of a zero-temperature uniformly charged liquid plasma model is found. The technique opens up for investigations of the heating and damping of cold plasma modes, as well as the coupling between them.PACS numbers: 37.30.+i,52.27.Gr,37.10. Vz,52.27.Jt,42.50.Pq Cold one-component plasma physics [1] has in the past two decades led to a series of interesting results due to the availability of fast computers [2][3][4][5] as well as the possibility to experiment with ensembles of trapped, lasercooled atomic ions [6][7][8][9][10][11][12][13][14][15][16]. Prominent examples are the understanding of structural properties of crystallized cold plasmas in both Penning [6,7] and Paul [8-10, 15, 16] traps, and the investigation of the normal mode dynamics of cold magnetized plasmas in Penning traps [11][12][13][14]. While there exist many similarities between experiments in Penning and Paul traps, the unmagnetized plasmas in Paul traps are e.g. known to heat up much faster than the magnetized plasmas in Penning traps due to the presence of the rf fields [3,17]. The lack of a rotational symmetry axis in Paul traps has as well been found to be responsible for the observation of specific crystalline structures [16]. Exploration of the normal mode dynamics of unmagnetized ion Coulomb crystals in e.g. linear Paul traps will hence add to our understanding of the influence of the trapping environment on the physics of such crystals. Furthermore, since large Coulomb crystals are excellent candidates for the realization of high-fidelity quantum memories for light [18], such studies can shed light on the influence of the excitation of these modes on the fidelity as well as on the prospect of storing several photonic quantum bits through deliberate excitations of specific vibrational modes. Larger Coulomb crystals have as well recently been considered as a system for performing quantum simulations, in which respect knowledge of normal mode dynamics is needed [19]. Finally, ion Coulomb crystals represent extremely interesting systems to study cavity optomechanics phenomena [20,21], since, in spite of their solid nature, they possess free atomic resonance properties and can hence be made very sensitive to the radiation pressure force exerted by optical fields.In this Letter, we report on the study of normal mode vibrations of Coulomb crystals of 40 Ca + ions in a linear Paul trap by a novel non-invasive technique. The technique is based on monitoring the coherent collective resonant response of the atomic ions constituting the crystal to a single photon optical cavity field [18]. By having a standing wave optical cavity incorporated in the tr...

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“…Other extensions of this paper could involve mixed clusters [54], include the natural micromotion arising from the radiofrequency traps [55], or try to determine whether scaling laws exist for the melting points as a function of size and trap anisotropy [20,21].…”

Section: Discussionmentioning

confidence: 99%

Structure and dynamics of ion clusters in linear octupole traps: Phase diagrams, chirality, and melting mechanisms

2011

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The stable structures and melting dynamics of clusters of identical ions bound by linear octupole radiofrequency traps are theoretically investigated by global optimization methods and molecular dynamics simulations. By varying the cluster sizes in the range of 10-1000 ions and the extent of trap anisotropy by more than one order of magnitude, we find a broad variety of stable structures based on multiple rings at small sizes evolving into tubular geometries at large sizes. The binding energy of these clusters is well represented by two contributions arising from isotropic linear and octupolar traps. The structures generally exhibit strong size effects, and chiral arrangements spontaneously emerge in many crystals. Sufficiently large clusters form nested, coaxial tubes with different thermal stabilities. As in isotropic octupolar clusters, the inner tubes melt at temperatures that are lower than the overall melting point.

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Coulomb Bicrystals of Species with Identical Charge-to-Mass Ratios

Cited by 31 publications

References 22 publications

Complex plasmas: a laboratory for strong correlations

Complex plasmas: a laboratory for strong correlations

Noninvasive Vibrational Mode Spectroscopy of Ion Coulomb Crystals through Resonant Collective Coupling to an Optical Cavity Field

Structure and dynamics of ion clusters in linear octupole traps: Phase diagrams, chirality, and melting mechanisms

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