63 citations · 507 across the 28 of their papers we have counts for
28 papers
Developing fractional quantum Hall states at even-denominator fillings 1/6 and 1/8
Chengyu Wang, P. T. Madathil, S. K. Singh +5
In the extreme quantum limit, when the Landau level filling factor , the dominant electron-electron interaction in low-disorder two-dimensional electron systems leads to exoti…
Origin of pinning disorder in magnetic-field-induced Wigner solids
Matthew L. Freeman, P. T. Madathil, L. N. Pfeiffer +5
At low Landau level filling factors (), Wigner solid phases of two-dimensional electron systems in GaAs are pinned by disorder, and exhibit a pinning mode, whose frequency is a…
Signatures of correlated defects in an ultra-clean Wigner crystal in the extreme quantum limit
P. T. Madathil, C. Wang, S. K. Singh +8
Low-disorder two-dimensional electron systems in the presence of a strong, perpendicular magnetic field terminate at very small Landau level filling factors in a Wigner crystal (WC…
Moving crystal phases of a quantum Wigner solid in an ultra-high-quality 2D electron system
P. T. Madathil, K. A. Villegas Rosales, Y. J. Chung +5
In low-disorder, two-dimensional electron systems (2DESs), the fractional quantum Hall states at very small Landau level fillings () terminate in a Wigner solid (WS) phase, wher…
Fractional Quantum Hall State at Filling Factor in Ultra-High-Quality GaAs 2D Hole Systems
Chengyu Wang, A. Gupta, S. K. Singh +6
Single-component fractional quantum Hall states (FQHSs) at even-denominator filling factors may host non-Abelian quasiparticles that are considered to be building blocks of topolog…
Metastable Charge Distribution Between Degenerate Landau Levels
Wenlu Lin, Xing Fan, Lili Zhao +6
We study two dimensional electron systems confined in wide quantum wells whose subband separation is comparable with the Zeeman energy. Two N = 0 Landau levels from different subba…
Probing quantum phases in ultra-high-mobility two-dimensional electron systems using surface acoustic waves
Mengmeng Wu, Xiao Liu, Renfei Wang +6
Transport measurement, which applies an electric field and studies the migration of charged particles, i.e. the current, is the most widely used technique in condensed matter studi…
Delocalization and Universality of the Fractional Quantum Hall Plateau-to-Plateau Transitions
P. T. Madathil, K. A. Villegas Rosales, C. T. Tai +5
Disorder and electron-electron interaction play essential roles in the physics of electron systems in condensed matter. In two-dimensional, quantum Hall systems, extensive studies…
Valley-tunable, even-denominator fractional quantum Hall state in the lowest Landau level of an anisotropic system
Md. Shafayat Hossain, M. K. Ma, Y. J. Chung +7
Fractional quantum Hall states (FQHSs) at even-denominator Landau level filling factors () are of prime interest as they are predicted to host exotic, topological states of matt…
Highly-Anisotropic Even-Denominator Fractional Quantum Hall State in an Orbitally-Coupled Half-Filled Landau Level
Chengyu Wang, A. Gupta, Y. J. Chung +5
The even-denominator fractional quantum Hall states (FQHSs) in half-filled Landau levels are generally believed to host non-Abelian quasiparticles and be of potential use in topolo…
Dynamic Response of Wigner Crystals
Lili Zhao, Wenlu Lin, Yoon Jang Chung +4
The Wigner crystal, an ordered array of electrons, is one of the very first proposed many-body phases stabilized by the electron-electron interaction. This electron solid phase has…
Fractional quantum Hall valley ferromagnetism in the extreme quantum limit
Md. Shafayat Hossain, M. K. Ma, Y. J. Chung +7
Electrons' multiple quantum degrees of freedom can lead to rich physics, including a competition between various exotic ground states, as well as novel applications such as spintro…
Robust Quantum Hall Ferromagnetism near a Gate-Tuned ν = 1 Landau Level Crossing
Meng K. Ma, Chengyu Wang, Y. J. Chung +5
In a low-disorder two-dimensional electron system, when two Landau levels of opposite spin or pseudospin cross at the Fermi level, the dominance of the exchange energy can lead to…
Even-Denominator Fractional Quantum Hall State at Filling Factor ν = 3/4
Chengyu Wang, A. Gupta, S. K Singh +6
Fractional quantum Hall states (FQHSs) exemplify exotic phases of low-disorder two-dimensional (2D) electron systems when electron-electron interaction dominates over the thermal a…
Composite Fermion Mass
K. A. Villegas Rosales, P. T. Madathil, Y. J. Chung +4
Composite fermions (CFs), exotic quasi-particles formed by pairing an electron and an even number of magnetic flux quanta emerge at high magnetic fields in an interacting electron…
Anisotropic, two-dimensional, disordered Wigner solid
Md. S. Hossain, M. K. Ma, K. A. Villegas-Rosales +5
The interplay between the Fermi sea anisotropy, electron-electron interaction, and localization phenomena can give rise to exotic many-body phases. An exciting example is an anisot…
Understanding limits to mobility in ultra-high-mobility GaAs two-dimensional electron systems: The quest for 100 million cm/Vs and beyond
Yoon Jang Chung, A. Gupta, K. W. Baldwin +3
For several decades now, ultra-high-mobility GaAs two-dimensional electron systems (2DESs) have served as the hallmark platform for various branches of research in condensed matter…
Fractional quantum Hall effect energy gap: role of electron layer thickness
K. A. Villegas Rosales, P. T. Madathil, Y. J. Chung +4
The fractional quantum Hall effect (FQHE) stands as a quintessential manifestation of an interacting two-dimensional electron system. One of FQHE's most fundamental characteristics…
Observation of spontaneous valley polarization of itinerant electrons
Md. S. Hossain, M. K. Ma, K. A. Villegas Rosales +5
Memory or transistor devices based on electron's spin rather than its charge degree of freedom offer certain distinct advantages and comprise a cornerstone of spintronics. Recent y…
Observation of Spontaneous Ferromagnetism in a Two-Dimensional Electron System
Md. S. Hossain, M. K. Ma, K. A. Villegas Rosales +5
What are the ground states of an interacting, low-density electron system? In the absence of disorder, it has long been expected that as the electron density is lowered, the exchan…
Competition between fractional quantum Hall liquid and Wigner solid at small fillings: Role of layer thickness and Landau level mixing
K. A. Villegas Rosales, S. K. Singh, Meng K. Ma +6
What is the fate of the ground state of a two-dimensional electron system (2DES) at very low Landau level filling factors () where interaction reigns supreme? An ordered array o…
Bloch Ferromagnetism of Composite Fermions
Md. Shafayat Hossain, Tongzhou Zhao, Songyang Pu +9
In 1929 Felix Bloch suggested that the paramagnetic Fermi sea of electrons should make a spontaneous transition to a fully-magnetized state at very low densities, because the excha…
Precise Experimental Test of the Luttinger Theorem and Particle-Hole Symmetry for a Strongly Correlated Fermionic System
Md. S. Hossain, M. A. Mueed, M. K. Ma +6
A fundamental concept in physics is the Fermi surface, the constant-energy surface in momentum space encompassing all the occupied quantum states at absolute zero temperature. In 1…
Thermal and quantum melting phase diagrams for a magnetic-field-induced Wigner solid
Meng K. Ma, K. A. Villegas Rosales, H. Deng +6
A sufficiently large perpendicular magnetic field quenches the kinetic (Fermi) energy of an interacting two-dimensional (2D) system of fermions, making them susceptible to the form…