13 citations · 53 across the 23 of their papers we have counts for
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Emergent non-Hermitian boundary contributions to charge pumping and electric polarization
K. Kyriakou, K. Moulopoulos
The phenomenon of charge pumping and the modern theory of electric polarization are reconsidered by analytically taking into account emergent non-Hermitian contributions. These are…
Orbital Magnetization in Solids: Boundary contributions as a non-Hermitian effect
K. Kyriakou, K. Moulopoulos
The theory of orbital magnetization is reconsidered by defining additional quantities that incorporate a non-Hermitian effect due to anomalous operators that break the domain of de…
Topological anomalies in the off-diagonal Ehrenfest theorem and their role on optical transitions in solar cells
Georgios Konstantinou, Konstantinos Moulopoulos
We analytically demonstrate the emergence of surface non-Hermitian boundary contributions that appear in an extended form of the quantum Ehrenfest theorem and are crucial (although…
Ground State thermodynamic and response properties of electron gas in a strong magnetic and electric field: Exact analytical solutions for a conventional semiconductor and for Graphene
Georgios Konstantinou, Konstantinos Moulopoulos
Consequences of an exceedingly strong electric field (E field) on the ground state energetics and transport properties of a 2D spinless electron gas in a perpendicular magnetic fie…
The "forgotten" pseudomomenta and gauge changes in generalized Landau Level problems: spatially nonuniform magnetic and temporally varying electric fields
Georgios Konstantinou, Konstantinos Moulopoulos
By perceiving gauge invariance as an analytical tool in order to get insight into the states of the "generalized Landau problem" (a charged quantum particle moving inside a magneti…
Dynamical extension of Hellmann-Feynman theorem and application to nonadiabatic quantum processes in Topological and Correlated Matter
Kyriakos Kyriakou, Konstantinos Moulopoulos
An extension of the Hellmann-Feynman theorem to one employing dynamical parameters that vary with time according to quantum dynamics is rigorously derived, avoiding any linear resp…
Thickness-induced violation of de Haas-van Alphen effect through exact analytical solutions at a one-electron and a one-Composite Fermion level
Georgios Konstantinou, Konstantinos Moulopoulos
A systematic study of the energetics of electrons in an interface in a magnetic field is reported with exact analytical calculations based on a Landau Level (LL) picture, by seriou…
The nontrivial role of interfacial or film-thickness in a magnetic field at a one-electron and a one-Composite Fermion level
G. Konstantinou, K. Moulopoulos
By developing a canonical approach that is exact, physically transparent and subtly different from standard methods, we present a systematic study with exact analytical calculation…
Beyond the Dirac phase factor: Dynamical Quantum Phase-Nonlocalities in the Schrödinger Picture
Konstantinos Moulopoulos
Generalized solutions of the standard gauge transformation equations are presented and discussed in physical terms. They go beyond the usual Dirac phase factors and they exhibit no…
Linear Dynamic Polarizability and the Absorption Spectrum of an Exciton in an Aharonov-Bohm Quantum Ring
A. V. Ghazaryan, A. P. Djotyan, K. Moulopoulos +1
We analytically solve the problem of an exciton (with particles interacting by a delta potential) in a one-dimensional quantum ring in the presence of an Aharonov-Bohm flux. By fol…
Some Exactly-Solvable Quantum Problems and their Applications to Hetero- and Nano-Structures with Nontrivial Topology
Georgios Konstantinou, Konstantinos Moulopoulos
Analytical calculations based on a Landau Level (LL) picture are reported for a many-electron system moving in an interface (with a finite-width Quantum Well (QW)) and in the prese…
Linear dynamic polarizability and absorption spectrum of an exciton in a quantum ring in a magnetic field
A. V. Ghazaryan, A. P. Djotyan, K. Moulopoulos +1
The problem of an electron-hole system interacting through a contact potential and moving in a one-dimensional quantum ring threaded by an Aharonov-Bohm flux is considered, both wi…