Zobrazeno 1 - 10
of 136
pro vyhledávání: '"Han, Zhaoyu"'
Autor:
Han, Zhaoyu, Kivelson, Steven
By explicit microscopic construction involving a mapping to a quantum vertex model subject to the `ice rule,' we show that an electronically `trivial' band insulator with suitable vibrational (phonon) degrees of freedom can host a ``resonating valenc
Externí odkaz:
http://arxiv.org/abs/2405.17539
A robust theory of the mechanism of pair density wave (PDW) superconductivity (i.e. where Cooper pairs have nonzero center of mass momentum) remains elusive. Here we explore the triangular lattice $t$-$J$-$V$ model, a low-energy effective theory deri
Externí odkaz:
http://arxiv.org/abs/2404.11950
We introduce the concept of "quantum geometric nesting'' (QGN) to characterize the idealized ordering tendencies of certain flat-band systems implicit in the geometric structure of the flat-band subspace. Perfect QGN implies the existence of an infin
Externí odkaz:
http://arxiv.org/abs/2401.04163
Autor:
Foutty, Benjamin A., Calvera, Vladimir, Han, Zhaoyu, Kometter, Carlos R., Liu, Song, Watanabe, Kenji, Taniguchi, Takashi, Hone, James C., Kivelson, Steven A., Feldman, Benjamin E.
First-order phase transitions produce abrupt changes to the character of both ground and excited electronic states. Here we conduct electronic compressibility measurements to map the spin phase diagram and Landau level (LL) energies of monolayer WSe$
Externí odkaz:
http://arxiv.org/abs/2401.01486
Publikováno v:
Phys. Rev. Lett. 132, 226001 (2024)
When the electron-phonon coupling is quadratic in the phonon coordinates, electrons can pair to form bipolarons due to phonon zero-point fluctuations, a purely quantum effect. We study superconductivity originating from this pairing mechanism in a mi
Externí odkaz:
http://arxiv.org/abs/2312.03844
Autor:
Liu, Fangze, Han, Zhaoyu
Publikováno v:
Phys. Rev. B 109, L121101 (2024)
We investigate the large Kondo coupling limit of the Kondo-Heisenberg model on one- and two-dimensional lattices. Focusing on the possible superconducting states when slightly doping the Kondo insulator state, we identify different pairing modes to b
Externí odkaz:
http://arxiv.org/abs/2310.17691
Publikováno v:
Phys. Rev. B 108, 195117 (2023)
We propose a two-fluid description of fractional quantum Hall systems, in which one component is a condensate of composite bosons and the other a Fermi liquid formed by composite fermions (or simply electrons). We employ the theory to model the inter
Externí odkaz:
http://arxiv.org/abs/2308.10190
Publikováno v:
Phys. Rev. B 109, L220502 (2024)
We analyze the transition temperature $T_c$ of bipolaronic superconductivity in a bond Su-Schrieffer-Heeger (bond-SSH) model -- also known as a bond Peierls model -- where the electron hoppings are modulated by bond phonons. Using a semiclassical ins
Externí odkaz:
http://arxiv.org/abs/2308.01961
Autor:
Han, Zhaoyu, Kivelson, Steven A.
Publikováno v:
Phys. Rev. Lett. 130, 186404 (2023)
We study a simple electron-phonon model on square and triangular versions of the Lieb-lattice using an asymptotically exact strong coupling analysis. At zero temperature and electron density $n = 1$ (one electron per unit cell), for various ranges of
Externí odkaz:
http://arxiv.org/abs/2210.16321
Publikováno v:
Phys. Rev. B 107, 075142 (2023)
We analyze the global ground-state (quantum) phase diagram of the one-dimensional Holstein model at half-filling as a function of the strength of the electron-phonon coupling (represented by the strength of the phonon-induced attraction, $U$) and the
Externí odkaz:
http://arxiv.org/abs/2209.05498