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Уважаемые сотрудники ИТФ,<br>
<br>
На заседании Ученого совета ИТФ в пятницу 21 июня 2019 состоится
коллоквиум с докладом:<br>
<br>
Антон Андреев<br>
<b>Двух-жидкостные явления в жидкостях Латтинжера</b><br>
<br>
One-dimensional quantum liquids are commonly treated using the
Luttinger liquid theory, which neglects elementary excitations with
high energies. In this approximation, in addition to the number of
particles, energy, and momentum the liquid possesses another
conserved quantity - J, which may be interpreted as the difference
between the numbers of right- and left- moving particles. Beyond the
Luttinger liquid approximation J is no longer conserved, but its
relaxation time is exponentially long at low temperatures. I will
show that as a result, one-dimensional quantum liquids exhibit
two-fluid behavior. In particular in a wide frequency interval they
support two sound modes that are similar to the first and second
sound in superfluid He. <br>
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