Introduction to cold atoms and Bose-Einstein condensation (II)

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1 Introduction to cold atoms and Bose-Einstein condensation (II) Wolfgang Ketterle Massachusetts Institute of Technology MIT-Harvard Center for Ultracold Atoms 7/7/04 Boulder Summer School

2 * 1925

3

4 History of Bose-Einstein condensation (mainly exp.) Theoretical prediction 1924/25 Bose and Einstein Superfluidity in liquid helium 1938 Fritz London 1983 Reppy et al. (Cornell): BEC of helium in vycor Excitons (complicated interactions - no BEC observed) Dilute atomic gases Spin-polarized hydrogen: agenda & experimental techniques (since late 70s) MIT (Greytak, Kleppner) BEC 98 Amsterdam (Silvera, Walraven) also: Harvard, BC, Turku, Cornell, Moscow Alkali atoms: 2D quantum degeneracy 98 Laser cooling ( 80s) Focused programs in Boulder and at MIT (since early 90s) June 95: Boulder (Cornell/Wieman) Sept. 95: MIT (W.K.) July 95 [indirect evidence]: Rice (Hulet) now: many experiments

5 3 particles, total energy = Classical % 6 20% 9 30% 12 40%

6 3 particles, total energy = Identical

7 3 particles, total energy = Bosons

8 3 particles, total energy = Bosons % 11% 44% 33%

9 3 particles, total energy = Fermions fermions bosons classical 3 0 0% 11% 10% % 11% 20% % 44% 30% % 33% 40%

10 3 particles, total energy = Classical 10 % probability for triple occupancy % probability for double occupancy

11 3 particles, total energy = Bosons 33 % probability for triple occupancy Bosons are gregarious! Fermions are loners! % probability for double occupancy

12 e 1 ( ε µ ) k B T classical particles Maxwell-Boltzmann statistics n(ε) = e ( ε µ ) 1 T k B 1 bosons Bose-Einstein statistics e ( ε µ ) 1 T k B + 1 fermions Fermi-Dirac statistics

13 n(ε) = e ( ε µ ) 1 T k B 1 bosons Bose-Einstein statistics µ=0 (photon number not conserved) 1 e ε k B T 1 photons Planck s blackbody spectrum

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15 Why do photons not Bose condense? Population per state N>N c Condensate! If we put in extra photons into the lowest mode they will be absorbed by the walls and thus increase the total entropy Bose-Einstein distribution with µ=0 N=N c Energy

16 Are different particles absolutely identical? Necessary assumption for indistinguishability In quantum field theory they are excitations of the same field Tests of the (anti-) symmetry of the state for bosons/fermions at the level of 10-9 and 10-26

17 Development of quantum statistics in three years 1924 Bose s paper 1924/25 Three papers by Einstein Particles are no longer statistically independent! Einstein mentioned hydrogen, helium and the electron gas as possible candidates for BEC 1925 Pauli exclusion principle 1926 Fermi-Dirac statistics Confusion about which statistics to apply 1927 Things were cleared up

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19 History of BEC W. Pauli, Z. Phys. 41, 81 (1927): We shall take the point of view also advocated by Dirac, that the Fermi, and not the Einstein-Bose, statistics applies to the material gas. A. Einstein (Dec. 1924) about BEC: The theory is pretty, but is there also some truth to it?

20 A. Einstein (December 1924) about BEC: The theory is pretty, but is there also some truth to it? Fritz London He realized in 1938 that BEC is an observable phenomenon

21 Criterion for BEC Thermal de Broglie wavelength ( T -1/2 ) equals distance between atoms (= n -1/3 ) n crit T 3/2 High density: n water : T = 1 K BUT: molecule/cluster formation, solidification no BEC

22

23 BEC: λ db >n -1/3

24 BEC: λdb>n-1/3

25 Criterion for BEC Thermal de Broglie wavelength ( T -1/2 ) equals distance between atoms (= n -1/3 ) n crit T 3/2 High density: n water : T = 1 K BUT: molecule/cluster formation, solidification no BEC Low density: n water /10 9 : T= 100 nk - 1 µk seconds to minutes lifetime of the atomic gas BEC

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29 Length and energy scales in BEC Size of the atom a 3 nm Separation between atoms n -1/3 200 nm Matter wavelength λ db 1 µm Healing length 2πξ 2µm Size of confinement a osc 30µm a << n -1/3 λ < 2πξ < a db osc k B T s-wave >> k B T c Gas! k B T > ω BEC > U int =( 2 /m)na

30 Cast of characters: nk tools Cooling Laser cooling Evaporative cooling Atoms for BEC Traps Magnetic traps Optical traps How to observe BEC Absorption imaging Dispersive imaging Manipulation of BEC Magnetic fields Rf Optical dipole force

31 The cooling methods

32

33 Phillips et al. (1985) Pritchard et al. (1987)

34 Hess, Kleppner, Greytak et al. (1986/7) Pritchard et al. (1989) Ketterle et al. (1993/4) Cornell et al. (1994)

35 Multi-stage cooling to BEC Temp. T Density n [cm n ] Phase space density nt -3/2 Oven 500 K Laser cooling 50 µk Evap. cooling 500 nk BEC ( nk)

36 Sodium BEC MIT

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39 Laser cooling 2.5 cm Laser cooling requires low density to avoid light absorption

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42 The problem Absorption cross section for light: σ opt = λ π cm 2 Elastic collision cross section: σ = 8πa coll cm 2

43 The solution Dark light trap ( Dark SPOT MOT ) Tight magnetic confinement ULTRA-high vacuum a few years of engineering

44 Magnetic trapping

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58 Bias field adjustment is critical

59 Gravito-Magnetic Trap magnetic potential Single coil carrying current I S levitates atoms against gravity with magnetic field gradient ~8 G/cm.

60 Gravito-Magnetic Trap gravitational potential magnetic potential Single coil carrying current I S levitates atoms against gravity with magnetic field gradient ~8 G/cm.

61 Gravito-Magnetic Trap trapped BEC joint potential magnetic potential gravitational potential Single coil carrying current I S levitates atoms against gravity with magnetic field gradient ~8 G/cm. Stable vertical confinement for z > R/2 above coil.

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