2016-12-13 · The team began by taking a population of rubidium-87 atoms, decelerating them with a Zeeman slower and then confining them in a magneto-optical trap. The atoms then underwent evaporative cooling in a magnetic trap and then an optical-dipole trap until approximately 250,000 remained at a temperature of about 100 nano Kelvin.
2013-7-11 · To coax the rubidium atoms to form a Bose-Einstein condensate the researchers used the standard method of several cycles of evaporation to cool them to less than one degree above absolute zero. The efficiency of their trap also reduced the cooling time of the atoms, allowing them to create a Bose-Einstein condensate in less than one second ...
2019-11-20 · Realization of the Hofstadter Hamiltonian with Ultracold Atoms in Optical Lattices ... and used external lasers to coax the atoms into circu-lar motion, analogous to the motion of electrons in a ... which the atoms (bosonic rubidium atoms) acquired a phase as they underwent circular motion. To …
2016-5-25 · The experiment involves shining interfering lasers onto a Bose-Einstein condensate of rubidium atoms, forming an optical lattice that traps the atoms into local sites. The researchers can adjust the power of the lasers and an applied magnetic field, which changes the …
2016-11-26 · atoms confined in small vapor-cells and have found a large number of applications, including digital communication, navigation systems, network synchronization, and others [1]. In view of mobile and battery-powered applications, there is an increasing demand for more radically miniaturized and low-power frequency standards.
Employing two-photon excitation, including a telecom wavelength, we observe that the waveguide transmission spectrum gets modified when the photonic mode is coupled to rubidium atoms through its ...
Thermionic effects similar to those studied by Langmuir and Kingdon for caesium have been found for rubidium and potassium. Because of the difference in the electron affinity of tungsten (4.53 volts) and that of an atom of rubidium or potassium (4.16 and 4.32 volts respectively) positive ions are formed which at filament temperatures above 1000ifmmode^circelsetextdegreefi{} are drawn to ...
2013-9-25 · Researchers began by pumped rubidium atoms into a vacuum chamber, then used lasers to cool the cloud of atoms to just a few degrees above absolute …
2002-1-3 · The atoms lose their individuality and merge into a single quantum state, forming what is known as a Bose-Einstein condensate (BEC). ... To coax …
2009-12-3 · A pair of laser beams illuminates an ultracold gas of rubidium atoms already in a collective state known as a Bose-Einstein condensate. ... they hope to coax atoms to behave like a class of ...
2018-1-22 · Scheme of the energy levels of the D2 transition in 87 Rb. Red arrows represent the two frequencies employed for the grey molasses; cooler (repumper) is blue-detuned with respect to the F = 2 (1 ...
2020-4-30 · In the lab, the team traps clouds of lithium (6Li) and potassium atoms (40K), cooling them with help from rubidium atoms (87Rb). Molecules form when Li and K pair up, with each experimental run making up to 10,000 such molecules. Because of the atoms'' different sizes these molecules have a large electric dipole moment.
2020-8-2 · Laser Cooling of Rubidium Atoms in a Vapor Cell 425 Fig. 1. Basic principle of the magneto-optical trap in one dimension. The atoms have an angular momentum of J = 0 (m, = 0) in the ground state and J'' = 1 (ml. = - 1, 0, + 1) in the excited state. They interact with counter-propagating laser beams, which are U+ and U- circularly polarized of
2011-5-19 · An alternative method is to first cool overlapping clouds of individual atoms and only then coax them into forming molecules. Using this technique, researchers have created ultracold molecules from weakly bound pairs of different alkali metals, notably potassium and rubidium. But such molecules always contain an even number of spins, so that ...
2017-4-18 · Physicists coax superfluid to have ''negative mass'' ... When the rubidium atoms are allowed to flow out of the bowl fast enough, the superfluid behaves as it had negative mass.
2010-7-30 · The Fermi-Hubbard (FH) model is used if the atoms are fermions (7, 8). This model has been applied to materials of key technological importance, such as the high-temperature superconducting cuprates. The Bose-Hubbard (BH) model is used if atoms are bosons, such as the rubidium-87 atoms used by Bakr et al. in their experiments. Variants of the ...
2021-7-8 · To coax a mixture of atoms into behaving identically -- as they would in a Bose-Einstein condensate -- the atoms need to be slowed considerably. This requires cooling them to less than 100 ...
2013-9-25 · Working with colleagues at the Harvard-MIT Center for Ultracold Atoms, a group led by Harvard Professor of Physics Mikhail Lukin and MIT Professor …
Hyperfine Structure of Rubidium Phys 1560 & 2010 – Brown University – October 2010 ... If we direct a laser at a collection of Rb atoms, photons cause transitions between states whenever the energy is an exact match; this absorption of energy can be measured to ... assorted coaxial cables
The first MOT is observed and cold rubidium cloud is characterized. I n a month everything has been assembled, MOT is observed and cold cloud is characterized. Bravo guys! Ticijana and Damir are moving MOT chamber into our new lab with the specialist help of our mechanic Ivan while keeping the UHV.
2021-6-3 · Optical Pumping of Rubidium Vapor D.C. Elton1, a) and J. Chia-Yib) Stony Brook University (Dated: 27 April 2012) We studied the hyper ne levels of Rubidium using the technique of optical pumping. Using the equation 0 = g J 0 h(2I+1) Bfor Rb-87 we found g F = 0:5177 :0002 and B earth = 0:416 :0002. For Rb-85 we found g F = 0:342 :0001 and B ...
2013-9-27 · Working with colleagues at the Harvard-MIT Center for Ultracold Atoms, Professor of Physics Mikhail Lukin and post-doctoral fellow Ofer Firstenberg have managed to coax photons into binding together to form molecules — a state of matter that, until recently, had been purely theoretical.
1999-6-3 · 2 as well as rubidium. These gases (in addition to playing active roles in the noble gas experiments) act as a bu er, keeping the Rb away from the walls of the cell. In the DBRM the lack of bu er gases allows rubid-ium atoms to e use between the pumping and masing chambers of the device. Without a bu er gas, however, the device is very
2016-3-31 · Measuring the magnetization of wandering spins. Interfering lasers create an effective magnetic for a cloud of cold rubidium atoms. Credit: S. Kelley/JQI. The swirling field of a magnet—rendered ...
2008-2-29 · That makes it a boson, and any number of identical bosons can squeeze into one quantum wave. So when physicists chill rubidium-87 gas to below a millionth of a kelvin, the atoms pile into the lowest energy wave to make a superfluid BEC. Atoms with an odd number of protons, neutrons, and electrons are far less gregarious.
They used new laser-cooling technology to coax a low-pressure gas of rubidium atoms to close to absolute zero and into a BEC 1. The rubidium atoms remain as a gas throughout the transition to a ...
2018-1-17 · There are a variety of atomic standards at the disposal of metrologists with large budgets, but the ones we will most commonly encounter use either caesium, or rubidium atoms.
2013-10-28 · As reported in Physical Review Letters [7, 8], both groups placed rubidium atoms in an optical lattice and used external lasers to coax the atoms into circular …
2018-2-16 · The scientists were able to coax photons to interact with another, similarly to how atoms attract or repel each other in ordinary matter. ... The team chilled rubidium atoms close to absolute zero ...
2017-5-16 · In each lab, they used lasers to coax a single photon out of a rubidium atom; according to quantum mechanics theory, colliding those two photons would entangle the rubidium atoms.