[1] Anderson M H, Enscher J R, Matthews M R, Wieman C E and
Cornell E A 1995 Science 269 198

[2] Davis K B, Mewes M -O, Andrews M R, van Druten N J, Durfee D
S, Kurn D M and Ketterle W 1995 Phys. Rev. Lett. 75 3969

[3] Bradley C C, Sackett C A, Tollett J J and Hulet R G 1995
Phys. Rev. Lett. 75 1687

[4] Capuzzi P and Herna\'ndez E S 1999 Phys. Rev. A 59
1488

[5] Ng H T, Law C K and Leung P T 2003 Phys. Rev. A 68
013604

[6] QIU J G 2006 Chin. Phys. Lett. 23 1387

[7] Andrews M R, Townsend C G, Miesner H J, Drufee D S, Kurn D M,
and Ketterle W 1997 Science 275 637

[8] Smerzi A, Fantoni S, Giovanazzi S and Shenoy S R 1997
Phys. Rev. Lett. 79 4950

[9] Streltsov A I and Cederbaum L S 2004 Phys. Rev. A
70 053607

[10] Shin Y, Saba M, Pasquini T A, Ketterle W, Pritchard D E and
Leanhardt A E 2004 Phys. Rev. Lett. 92 050405

[11] Rey A M, Satija I I and Clark C W 2006 Phys. Rev. A
73 063610

[12] Priyadarshee A, Chandrasekharan S, Lee J -W and Baranger H U
2006 Phys. Rev. Lett. 97 115703

[13] Alexandrov A S 2006 Phys. Rev. Lett. 96 147003

[14] Alexandrov A S and Edwards P P 2000 Physica C 331 97

[15] Palo S D, Castellani C, Castro C D and Chakraverty B K 1999
Phys. Rev. B 60 564

[16] Gonzalez A, Partoens B, Matulis A and Peeters F M 1999
Phys. Rev. B 59 1653

[17] Tanatar B, Davoudi B and Kohandel M 2000 Phys.
Rev. B 62 12597

[18] Davoudi B, Strepparola E, Tanatar B and Tosi M P 2001
Phys. Rev. B 63 104505

[19] Dalfovo F, Giorgini S, Pitaevskii L P and Stringari S
1999 Rev. Mod. Phys. 71 463

[20] Mahmud K W, Kutz J N and Reinhardt W P 2002 Phys. Rev.
A 66 063607

[21] Minguzzi A, Succi S, Toschi F, Tosi M P and Vignolo P 2004
Phys. Rep. 395 223

[22] Moroni S, Conti S and Tosi M P 1996 Phys. Rev. B
53 9688

[23] Palo S D, Conti S and Moroni S 2004 Phys. Rev. B
69 035109

[24] Reynolds P J, Ceperley D M, Alder B J and Lester W A 1982
J. Chem. Phys. 77 5593

[25] Foulkes W M C, Mtias L, Needs R J and Rajagopal G
2001 Rev. Mod. Phys. 73 33