Papers Published – Page 8 – Quantum matter from atomic gases

Direct observation of zitterbewegung in a Bose–Einstein condensate

By Ian Spielman Posted on 2013/07/03 Posted in Group News, Papers Published, RbK

Zitterbewegung, a force-free trembling motion ﬁrst predicted for relativistic fermions like electrons, was an unexpected consequence of the Dirac equation’s uniﬁcation of quantum mechanics and special relativity. Though the oscillatory motion’s large frequency and small amplitude have precluded its measurement with electrons, zitterbewegung is …

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The spin Hall effect in a quantum gas

By Ian Spielman Posted on 2013/06/05 Posted in Atomtronics, Group News, Papers Published, RbK

Electronic properties such as current flow are generally independent of the electron’s spin angular momentum, an internal degree of freedom possessed by quantum particles. The spin Hall effect, first proposed 40 years ago, is an unusual class of phenomena in …

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Review: Spin-orbit coupling in atomic gases

By Ian Spielman Posted on 2013/02/07 Posted in Atomtronics, Group News, Papers Published, Theory

Spin–orbit coupling links a particle’s velocity to its quantum-mechanical spin, and is essential in numerous condensed matter phenomena, including topological insulators and Majorana fermions. In solid-state materials, spin–orbit coupling originates from the movement of electrons in a crystal’s intrinsic electric …

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Synthetic Partial Waves in Ultracold Atomic Collisions

By Ian Spielman Posted on 2012/01/20 Posted in Group News, Papers Published, RbK

Interactions between particles can be strongly altered by their environment. We demonstrate a technique for modifying interactions between ultracold atoms by dressing the bare atomic states with light, creating an effective interaction of vastly increased range that scatters states of …

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Spin-orbit-coupled Bose-Einstein condensates

By Ian Spielman Posted on 2011/03/02 Posted in Atomtronics, Group News, Papers Published, RbK

Spin–orbit (SO) coupling—the interaction between a quantum particle’s spin and its momentum—is ubiquitous in physical systems. In condensed matter systems, SO coupling is crucial for the spin-Hall effect and topological insulators; it contributes to the electronic properties of materials such …

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Phases of a Two-Dimensional Bose Gas in an Optical Lattice

By Ian Spielman Posted on 2010/09/09 Posted in Group News, Papers Published, RbK

Karina’s paper [Phys. Rev. Lett. 105, 110401 (2010)] featuring a fantastic measurement of the SF/MI phase transition in a 2D Bose-Hubbard system has been published in PRL. Our result is in agreement with QMC calculations with no adjustable parameters. This work …

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Synthetic magnetic fields for ultracold neutral atoms

By Ian Spielman Posted on 2009/12/09 Posted in Papers Published, RbK

Ultracold atoms are an excellent system to realize important models in condensed matter physics, owing to its nearly disorder-free and tunable properties. One of the most intriguing topics is the quantum-Hall physics of 2D electronic systems in a strong magnetic …

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Quantum and classical dynamics of a Bose-Einstein condensate in a large-period optical lattice

By Ian Spielman Posted on 2009/10/29 Posted in Group News, Papers Published

We experimentally investigate diffraction of a 87Rb Bose-Einstein condensate from a one-dimensional optical lattice. We use a range of lattice periods and timescales, including those beyond the Raman-Nath limit. We compare the results to numerical solutions of the Gross-Pitaevskii equation …

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Rapid production of 87Rb Bose-Einstein condensates in a combined magnetic and optical potential

By Ian Spielman Posted on 2009/06/29 Posted in Group News, Papers Published, RbK

We describe an apparatus for quickly and simply producing 87Rb Bose-Einstein condensates. It is based on a magnetic quadrupole trap and a red-detuned optical dipole trap. We collect atoms in a magneto-optical trap (MOT) and then capture the atoms in …

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Raman processes and effective gauge potentials

By Ian Spielman Posted on 2009/06/05 Posted in Papers Published, RbK

A technique is described by which light-induced gauge potentials allow systems of ultracold neutral atoms to behave like charged particles in a magnetic field. Here, atoms move in a uniform laser field with a spatially varying Zeeman shift and experience …

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Category: Papers Published