Structured doping with light forces

Schulze, Th.; Müther, T.; Jürgens, Dirk; Brezger, B.; Oberthaler, Markus K.; Pfau, Tilman; Mlynek, J.

doi:10.1063/1.1355664

Cited by 27 publications

(7 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Phase gratings based on the non-dissipative dipole force were demonstrated for the diffraction of atomic beams both in the thin-grating or Raman-Nath regime [7] and in the thick-grating or Bragg regime [8]. They have been successfully implemented to build up complete Mach-Zehnder interferometers [9,10] and they find applications in atom lithography [11,12] or the manipulation of Bose Einstein condensates [13]. Combinations of absorptive and phase structures can also be used for complex blazed gratings [14].…”

mentioning

confidence: 99%

See 1 more Smart Citation

Diffraction of Complex Molecules by Structures Made of Light

et al. 2001

View full text Add to dashboard Cite

We demonstrate that structures made of light can be used to coherently control the motion of complex molecules. In particular, we show diffraction of the fullerenes C60 and C70 at a thin grating based on a standing light wave. We prove experimentally that the principles of this effect, well known from atom optics, can be successfully extended to massive and large molecules which are internally in a thermodynamic mixed state and which do not exhibit narrow optical resonances. Our results will be important for the observation of quantum interference with even larger and more complex objects.

show abstract

mentioning

confidence: 99%

“…They have been successfully implemented to build up complete Mach-Zehnder interferometers [9,10] and they find applications in atom lithography [11,12] or the manipulation of Bose Einstein condensates [13]. Combinations of absorptive and phase structures can also be used for complex blazed gratings [14].…”

mentioning

confidence: 99%

Diffraction of Complex Molecules by Structures Made of Light

et al. 2001

View full text Add to dashboard Cite

show abstract

“…It has already been used to grow nanostructures on substrates by direct deposition of laser-focused thermal atomic beams [32,33]. Furthermore, structured doping has been demonstrated by simultaneously depositing a homogeneous matrix material and laser-focused chromium [34]. Performing the step from incoherent thermal atomic beams to coherent atom sources (BEC's), promises to increase the potential of atom lithography in a similar way like the invention of the laser did in classical optical lithography.…”

mentioning

confidence: 99%

Bose-Einstein Condensation of Chromium

et al. 2005

View full text Add to dashboard Cite

We report on the generation of a Bose-Einstein condensate in a gas of chromium atoms, which will make studies of the effects of anisotropic long-range interactions in degenerate quantum gases possible. The preparation of the chromium condensate requires novel cooling strategies that are adapted to its special electronic and magnetic properties. The final step to reach quantum degeneracy is forced evaporative cooling of 52 Cr atoms within a crossed optical dipole trap. At a critical temperature of Tc ≈700 nK, we observe Bose-Einstein condensation by the appearance of a two-component velocity distribution. Released from an anisotropic trap, the condensate expands with an inversion of the aspect ratio. We observe critical behavior of the condensate fraction as a function of temperature and more than 50,000 condensed 52 Cr atoms. The essential properties of degenerate quantum gases depend on range, strength and symmetry of the present interactions. Since the first observation of Bose-Einstein condensation in weakly interacting atomic gases, eight different elements have been Bose-Einstein condensed [1,2,3,4,5,6,7,8]. All these elements, mainly alkali atoms, interact dominantly via short-range isotropic potentials. Based on this effective contact interaction, many exciting phenomena have been studied [9,10]. Examples are the realization of four-wave mixing with matter waves [11] as well as the observation of vortices [12,13] and solitons [14,15,16] in degenerate quantum gases. Bose-Einstein condensates (BECs) with contact interaction have also been used to investigate solid-state physics problems like the Mott-metal-insulator transition [17,18]. Tuning the contact interaction, the collapse and explosion ("Bosenova") of Bose-Einstein condensates has been studied [19] and new types of quantum matter like a Tonks-Girardeau gas have been realized [20]. In a chromium Bose-Einstein condensate, one can not only tune the short-range contact interaction using one of the recently observed Feshbach resonances [21] but also investigate effects of the longrange and anisotropic dipole-dipole interaction. This becomes possible because, compared to other Bose-condensed elements, the transition metal chromium has a unique electronic structure. The valence shell of its ground state contains six electrons with parallel spin alignment (electronic configuration: [Ar]3d 5 4s 1 ). For the bosonic chromium isotopes, which have no nuclear spin, this gives rise to a total electronic spin quantum number of 3 and a very high magnetic moment of 6 µ B (µ B is the Bohr magneton) in its ground state 7 S 3 . Since the magnetic dipole-dipole interaction (MDDI) scales with the square of the magnetic moment, it is a factor of 36 higher for chromium than for alkali atoms. For this reason, dipole-dipole interactions which have not yet been investigated experimentally in degenerate quantum gases will become observable in chromium BEC. For example, it was shown in [22] that the MDDI in chromium is strong enough to manifest itself in a well pronounced modif...

show abstract

“…A possibilidade de cultivar nanoestruturas através da litografia atômica com átomos incoerentes (caso não degenerado) também já foi demonstrada [34,35]. A dopagem estrutural também já foi demonstrada pelo uso simultâneo de um feixe atômico e a matriz de um material homogêneo [36]. A passagem da litografia atômica constituída de átomos em estados quânticos incoerentes (não degenerado) para átomos em estados quânticos coerentes (degenerados) aumenta consideravelmente as possibilidades da litografia atômica.…”

Section: Conclusãounclassified

Estudo teórico de transição quântica de fases em gases bosônicos aprisionados por redes ópticas periódica e quase periódica

Paes

Nascimento

2018

Rev. Bras. Ensino Fís.

View full text Add to dashboard Cite

Resumo Estudamos qualitativamente as propriedades microscópicas de um condensado bosônico em uma rede óptica periódica através do modelo homogêneo de Bose-Hubbard, e em uma rede quase periódica, através do modelo não homogêneo de Bose-Hubbard. Ambos os modelos são resolvidos analiticamente através da Aproximação de Campo Médio. Enfatizamos o aspecto didático do estudo com riqueza descritiva de detalhes no aspecto matemático.

show abstract

Structured doping with light forces

Cited by 27 publications

References 13 publications

Diffraction of Complex Molecules by Structures Made of Light

Diffraction of Complex Molecules by Structures Made of Light

Bose-Einstein Condensation of Chromium

Estudo teórico de transição quântica de fases em gases bosônicos aprisionados por redes ópticas periódica e quase periódica

Contact Info

Product

Resources

About