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Raman,
Chandra
Raman,
Chandra
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ItemMiniature Atomic Beams for Integrated Atomic Quantum Devices(Georgia Institute of Technology, 2020-01-14) Raman, ChandraAtomic sensors—devices that utilize individual atoms as the sensing mechanism—offer enormous prospects for high sensitivity, accuracy and immunity to environmental noise. This is because such sensors leverage quantum mechanical properties of the atom such as internal energy level splittings that do not change with time and are immune to sensor fabrication errors. While some of these sensors are now commercially available, they are still bulky instruments that must be individually assembled by hand and will not be widely disseminated in their current form. Recently we have developed a novel platform for the realization of on-chip atomic devices with applicability to realizing new wafer-scale atomic clocks, gyroscopes and other sensors. In this talk I will discuss how we realize such devices in the laboratory, and what the prospects are for realizing the dream of co-integrating precision atomic and electronic sensing instruments.
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ItemCelebration of 2018 Physics Nobel Prize: Lighting the way with microscopic tractor beams and sculpted laser pulse(Georgia Institute of Technology, 2018-10-23) Curtis, Jennifer ; Raman, Chandra ; Trebino, RickThe 2018 Nobel Prize in Physics recognizes two breakthrough inventions in laser physics. The first, optical tweezers, allows scientist and engineers to use lasers like the tractor beams of Star Trek to manipulate everything from molecules to living cells. Optical tweezers have provided researchers with fingers in the microscopic world that can pull apart DNA, probe the mechanics of life, detect disease and study fundamental interactions in biology, physics, chemistry and engineering. The second breakthrough, chirped pulse amplification, enabled the construction of lasers of incredible power and precision. With the super-high power lasers came cutting-edge applications as diverse as attosecond time-resolved dynamics of atoms and molecules and laser eye surgery. In this public talk, Georgia Tech Professor Rick Trebino will give an overview of optical physics. Professors Jennifer Curtis and Chandra Raman will present a brief history of these discoveries and discuss their impacts on science and society, with an audience Q&A session afterwards.
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ItemUltracold sodium and rubidium mixtures: collisions, interactions and heteronuclear molecule formation(Georgia Institute of Technology, 2012-10-31) Raman, Chandra
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ItemSpinor Bose-Einstein Condensates and Quantum Antiferromagnetism(Georgia Institute of Technology, 2011-09-21) Raman, ChandraBose-Einstein condensates (BECs) have revolutionized atomic physics, a revolution which, sixteen years after their discovery, shows little sign of stopping. The attention of the quantum gases community has increasingly shifted from studies of broad features of the many-body condensed state to more specific realizations based upon control of spin state, trapping geometry, dimensionality and temporal behavior. In many regards quantum gases have no direct counterpart in condensed matter, although many parallels do exist, and these serve to guide efforts at the interface between disciplines. Experiments in our laboratory investigate the spinor nature of a sodium BEC, an example of a quantum antiferromagnet. The interplay between the quadratic Zeeman effect and spin-spin interactions gives rise to a rich phase diagram of possibilities. In this talk I will describe experiments that explore the dynamical behavior of such a BEC in the vicinity of a quantum phase transition. Our work highlights the experimental knobs and probes that are available to explore these fascinating quantum systems.
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ItemMicroscopic manipulation of Bose-Einstein condensates(Georgia Institute of Technology, 2011-07-29) Raman, Chandra