Нижні енергетичні рівні одновимірного слабко взаємодіючого бозе-газу з нульовими межовими умовами

Автор(и)

  • M. D. Tomchenko Bogolyubov Institute for Theoretical Physics, Nat. Acad. of Sci. of Ukraine

DOI:

https://doi.org/10.15407/ujpe64.3.250

Ключові слова:

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Анотація

Ми дiагоналiзували вторинно квантований гамiльтонiан одновимiрного бозе-газу для вiдштовхувального мiжатомного потенцiалу загального вигляду та нульових межових умов. При малiй константi зв’язку розв’язки для енергiї основного стану E0 та закону дисперсiї E(k) збiгаються з вiдомими розв’язками для перiодичної системи. При цьому одночастинкова матриця густини F1(x, x′) є близькою до розв’язку для перiодичної системи, якщо T = 0, та помiтно вiдрiзняється вiд останнього при T > 0. Також ми отримали, що хвильова функцiя ⟨w(x, t)⟩ ефективного конденсату близька до константи √︀N0/L всерединi системи та обертається на нуль на межах (тут N0 – число атомiв у конденсатi, L – розмiр системи). Ми знайшли критерiй застосовностi методу, згiдно з яким метод працює для скiнченної системи з малою константою зв’язку (слабка взаємодiя або велика концентрацiя) та дуже малою температурою.

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Опубліковано

2019-04-01

Як цитувати

Tomchenko, M. D. (2019). Нижні енергетичні рівні одновимірного слабко взаємодіючого бозе-газу з нульовими межовими умовами. Український фізичний журнал, 64(3), 250. https://doi.org/10.15407/ujpe64.3.250

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