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Уважаемые коллеги,<br>
<br>
Напоминаю, что сегодня также состоится коллоквиум, который из-за
разницы во времени между США и Москвой начнется <b>в 16:00</b>, на
котором будет заслушан доклад : <br>
<br>
Tigran Sedrakyan (University of Massachusetts, Amherst)<br>
<b><font size="4">Moat-band physics and emergent excitonic
topological order in correlated electron-hole bilayers</font></b><br>
<br>
The role of the particle-particle interaction becomes increasingly
important if the spectral band structure of a free system has
increasing degeneracy. Ultimately, it will be the role of
interactions to choose the state of the system. Examples include the
systems with the lowest band having a degenerate minimum along a
closed contour in the reciprocal space -- the Moat. A weak
perturbation can set a new energy scale describing the state with
qualitatively different properties in such a limit of infinite
degeneracy. In this talk, I will discuss the general principles
behind the universal properties of correlated bosons on moat bands,
which host topological order with long-range quantum entanglement.
In particular, I will discuss moat-band phenomena in shallowly
inverted InAs/GaSb quantum wells, where we observe an unconventional
time-reversal-symmetry breaking excitonic ground state under
imbalanced electron and hole densities. I will show that the strong
frustration of the system leads to a moat band for excitons,
resulting in a time-reversal-symmetry breaking excitonic topological
order, which explains all our experimental observations.<br>
<br>
<br>
ID и пароль онлайн-трансляций в Zoom те же, что и для предыдущих
трансляций семинаров и докладов на Ученом совете:<br>
<div class="moz-cite-prefix"> <a class="moz-txt-link-freetext"
href="https://zoom.us/j/96899364518?pwd=MzBsR2lYT0lYL2x2b1oyNU9LeWlWUT09">https://zoom.us/j/96899364518?pwd=MzBsR2lYT0lYL2x2b1oyNU9LeWlWUT09</a><br>
Meeting ID: 968 9936 4518<br>
Пароль: 250319</div>
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