Cunyuan Jiang
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View article: Designing atomic-scale transistor in topological insulators through vacancy-induced localized modes
Designing atomic-scale transistor in topological insulators through vacancy-induced localized modes Open
Topological insulators (TIs) have been considered as promising candidates for next generation of electronic devices due to their topologically protected quantum transport phenomena. In this work, a scheme for atomic-scale field effect tran…
View article: A flat-mode perspective on the boson peak in amorphous solids
A flat-mode perspective on the boson peak in amorphous solids Open
The boson peak is a characteristic anomaly of amorphous solids broadly defined as a low-energy excess in the density of states and heat capacity compared to the textbook predictions of Debye theory. The origin of this anomaly has long been…
View article: The anomalous density of states and quasi-localized vibration through homogeneous thermalization of an inhomogeneous elastic system
The anomalous density of states and quasi-localized vibration through homogeneous thermalization of an inhomogeneous elastic system Open
Amorphous solids exhibit dynamic inhomogeneity due to their lack of translational symmetry, leading to distinct vibrational properties compared to crystalline solids. These include anomalous low-frequency vibrational density of states (VDO…
View article: Can we build a transistor using vacancy-induced bound states in a topological insulator
Can we build a transistor using vacancy-induced bound states in a topological insulator Open
Topological insulators (TIs) have been considered as promising candidates for next generation of electronic devices due to their topologically protected quantum transport phenomena. In this work, a scheme for atomic-scale field effect tran…
View article: Designing atomic-scale resistive circuits in topological insulators through vacancy-induced localized modes
Designing atomic-scale resistive circuits in topological insulators through vacancy-induced localized modes Open
We demonstrate that vacancies can induce topologically protected localized electronic excitations within the bulk of a topological insulator, and when sufficiently close, give rise to one-dimensional propagating chiral bulk modes. We show …
View article: Topological signatures of collective dynamics and turbulent-like energy cascades in apolar active granular
Topological signatures of collective dynamics and turbulent-like energy cascades in apolar active granular Open
Active matter refers to a broad class of non-equilibrium systems where energy is continuously injected at the level of individual ``particles". These systems exhibit emergent collective behaviors that have no direct thermal-equilibrium cou…
View article: Experimental observation of gapped shear waves and liquid-like to gas-like dynamical crossover in active granular matter
Experimental observation of gapped shear waves and liquid-like to gas-like dynamical crossover in active granular matter Open
Unlike crystalline solids, liquids lack long-range order, resulting in diffusive shear fluctuations rather than propagating waves. Simulations predict that liquids exhibit a k-gap in wave-vector space, where solid-like transverse waves rea…
View article: Revealing the Geometrical and Vibrational Properties of the Defects Driving the Boson Peak
Revealing the Geometrical and Vibrational Properties of the Defects Driving the Boson Peak Open
In amorphous solids, the vibrational density of states shows an excess of modes over the Debye model, known as the boson peak, whose origin remains unclear. Studies suggest a link to quasi-localized nonphononic vibrations or 'defects,' but…
View article: Experimental observation of gapped shear waves and liquid-like to gas-like dynamical crossover in active granular matter
Experimental observation of gapped shear waves and liquid-like to gas-like dynamical crossover in active granular matter Open
Unlike crystalline solids, liquids do not exhibit long-range order due to frequent structural rearrangements. When considering shorter time and length scales, molecular dynamics simulations and theoretical propositions suggest that collect…
View article: Correlation between optical phonon softening and superconducting <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msub> <mml:mi>T</mml:mi> <mml:mrow> <mml:mi>c</mml:mi> </mml:mrow> </mml:msub> </mml:mrow> </mml:math> in YBa<sub>2</sub>Cu<sub>3</sub>O<sub>x</sub> within d-wave Eliashberg theory
Correlation between optical phonon softening and superconducting in YBa<sub>2</sub>Cu<sub>3</sub>O<sub>x</sub> within d-wave Eliashberg theory Open
We provide a mathematical description, based on d -wave Eliashberg theory, of the strong correlation between the experimentally observed softening of Raman modes associated with in-plane oxygen motions and the corresponding superconducting…
View article: Shaping the topology of twisted bilayer graphene via time-reversal symmetry breaking
Shaping the topology of twisted bilayer graphene via time-reversal symmetry breaking Open
Symmetry breaking is an effective tool for tuning the transport and topological properties of 2D layered materials. Among these materials, twisted bilayer graphene (TBG) has emerged as a promising platform for new physics, characterized by…
View article: Dispersionless Flat Mode and Vibrational Anomaly in Active Brownian Vibrators Induced by String-like Dynamical Defects
Dispersionless Flat Mode and Vibrational Anomaly in Active Brownian Vibrators Induced by String-like Dynamical Defects Open
In recent years, active Brownian particles have emerged as a prominent model system for comprehending the behaviors of active matter, wherein particles demonstrate self-propelled motion by harnessing energy from the surrounding environment…
View article: Phonons in stringlet-land and the boson peak
Phonons in stringlet-land and the boson peak Open
Solid materials that deviate from the harmonic crystal paradigm exhibit characteristic anomalies in the specific heat and vibrational density of states (VDOS) with respect to Debye's theory predictions. The boson peak (BP), a low-frequency…
View article: Experimental observation of gapped shear waves and liquid-like to gas-like dynamical crossover in active granular matter
Experimental observation of gapped shear waves and liquid-like to gas-like dynamical crossover in active granular matter Open
Unlike crystalline solids, liquids lack long-range order, resulting in diffusive shear fluctuations rather than propagating waves. Simulations predict that liquids exhibit a $k$-gap in wave-vector space, where solid-like transverse waves r…
View article: Stringlet Excitation Model of the Boson Peak
Stringlet Excitation Model of the Boson Peak Open
The boson peak (BP), a low-energy excess in the vibrational density of states over the Debye contribution, is often identified as a characteristic of amorphous solid materials. Despite decades of efforts, its microscopic origin still remai…
View article: Glassy heat capacity from overdamped phasons and hypothetical phason-induced superconductivity in incommensurate structures
Glassy heat capacity from overdamped phasons and hypothetical phason-induced superconductivity in incommensurate structures Open
Phasons are collective low-energy modes that appear in disparate condensed matter systems such as quasicrystals, incommensurate structures, fluctuating charge density waves, and moir\'e superlattices. They share several similarities with a…
View article: A quantitative theoretical model of the boson peak based on stringlet excitations
A quantitative theoretical model of the boson peak based on stringlet excitations Open
The boson peak (BP), a low-energy excess in the vibrational density of states over the phonon Debye contribution, is usually identified as one of the distinguishing features between ordered crystals and amorphous solid materials. Despite d…
View article: Correlation between optical phonon softening and superconducting $T_c$ in YBa$_2$Cu$_3$O$_x$ within $d$-wave Eliashberg theory
Correlation between optical phonon softening and superconducting $T_c$ in YBa$_2$Cu$_3$O$_x$ within $d$-wave Eliashberg theory Open
We provide a mathematical description, based on d-wave Eliashberg theory, of the strong correlation between the experimentally observed softening of Raman modes associated with in-plane oxygen motions and the corresponding superconducting …
View article: Engineering flat bands in twisted-bilayer graphene away from the magic angle with chiral optical cavities
Engineering flat bands in twisted-bilayer graphene away from the magic angle with chiral optical cavities Open
Twisted bilayer graphene (TBG) is a recently discovered two-dimensional superlattice structure which exhibits strongly-correlated quantum many-body physics, including strange metallic behavior and unconventional superconductivity. Most of …
View article: Glassy heat capacity from overdamped phasons and a hypothetical phason-induced superconductivity in incommensurate structures
Glassy heat capacity from overdamped phasons and a hypothetical phason-induced superconductivity in incommensurate structures Open
Phasons are collective low-energy modes that appear in disparate condensed matter systems such as quasicrystals, incommensurate structures, fluctuating charge density waves, and Moiré superlattices. They share several similarities with aco…
View article: Possible enhancement of the superconducting <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>T</mml:mi> <mml:mrow> <mml:mi>c</mml:mi> </mml:mrow> </mml:msub> </mml:math> due to sharp Kohn-like soft phonon anomalies
Possible enhancement of the superconducting due to sharp Kohn-like soft phonon anomalies Open
Phonon softening is a ubiquitous phenomenon in condensed matter systems which is often associated with charge density wave (CDW) instabilities and anharmonicity. The interplay between phonon softening, CDW and superconductivity is a topic …
View article: Possible enhancement of the superconducting $T_c$ due to sharp Kohn-like soft phonon anomalies
Possible enhancement of the superconducting $T_c$ due to sharp Kohn-like soft phonon anomalies Open
Phonon softening is a ubiquitous phenomenon in condensed matter systems which is often associated with charge density wave (CDW) instabilities and anharmonicity. The interplay between phonon softening, CDW and superconductivity is a topic …
View article: Uniaxial strain induced symmetry lowering and valleys drift in MoS<sub>2</sub>
Uniaxial strain induced symmetry lowering and valleys drift in MoS<sub>2</sub> Open
The uniaxial strain is an effective way to change the symmetry of a crystal and thus tuning their electronic properties. In the present work, we elucidate the physical mechanism of the symmetry-broken-induced energy valleys drift in monola…