What other materials beyond MoS2 could potentially exhibit similar optical control over valley polarization, and what would be the key considerations in exploring such materials?

How could the transient breaking of time and space inversion symmetry through the trefoil optical pulses be further leveraged to control other electronic properties beyond just valley polarization?

What potential applications, beyond information storage and quantum information processing, could emerge from the ability to optically control the valley degree of freedom in materials at ultrafast timescales?


Optical control of valley polarization in bulk MoS2


topic


Optical control over the valley degree of freedom in materials can be achieved using spin angular momentum-shaped trefoil optical pulses, enabling non-resonant and ultrafast manipulation of electronic topology in bulk MoS2.


coremsg

The valley degree of freedom1,2,3,4 of electrons in materials promises routes towards energy-efficient information storage with enticing prospects for quantum information processing5,6,7. Current challenges in utilizing valley polarization are symmetry conditions that require monolayer structures8,9 or specific material engineering10,11,12,13, non-resonant optical control to avoid energy dissipation and the ability to switch valley polarization at optical speed. We demonstrate all-optical and non-resonant control over valley polarization using bulk MoS2, a centrosymmetric material without Berry curvature at the valleys. Our universal method utilizes spin angular momentum-shaped trefoil optical control pulses14,15 to switch the material’s electronic topology and induce valley polarization by transiently breaking time and space inversion symmetry16 through a simple phase rotation. We confirm valley polarization through the transient generation of the second harmonic of a non-collinear optical probe pulse, depending on the trefoil phase rotation. The investigation shows that direct optical control over the valley degree of freedom is not limited to monolayer structures. Indeed, such control is possible for systems with an arbitrary number of layers and for bulk materials. Non-resonant valley control is universal and, at optical speeds, unlocks the possibility of engineering efficient multimaterial valleytronic devices operating on quantum coherent timescales.

We develop an optical method that can set and read the state of electrons in the valley polarization of bulk transition metal dichalcogenide semiconductors, with potential utility as digital storage at quantum coherent timescales and application in quantum computing.

Valleytronics in bulk MoS2 with a topologic optical field - Nature

Valleytronics in bulk MoS2 with a topologic optical field

### What other materials beyond MoS2 could potentially exhibit similar optical control over valley polarization, and what would be the key considerations in exploring such materials?
Answer 1 here

### How could the transient breaking of time and space inversion symmetry through the trefoil optical pulses be further leveraged to control other electronic properties beyond just valley polarization?
Answer 2 here

### What potential applications, beyond information storage and quantum information processing, could emerge from the ability to optically control the valley degree of freedom in materials at ultrafast timescales?
Answer 3 here

```markdown
### title_rewrite
Achieving Optical Control over Valley Polarization in Bulk Molybdenum Disulfide (MoS2) through Topological Optical Fields

### category
Optoelectronics

### topic
Optical control of valley polarization in bulk MoS2

### coremsg
Optical control over the valley degree of freedom in materials can be achieved using spin angular momentum-shaped trefoil optical pulses, enabling non-resonant and ultrafast manipulation of electronic topology in bulk MoS2.

### note
The article presents a novel approach to achieve optical control over the valley degree of freedom in bulk molybdenum disulfide (MoS2), a centrosymmetric material without inherent Berry curvature at the valleys. The key insights are:

1. Current challenges in utilizing valley polarization include the need for monolayer structures or specific material engineering, as well as the requirement for resonant optical control to avoid energy dissipation and the ability to switch valley polarization at optical speed.

2. The researchers demonstrate an all-optical and non-resonant method to control valley polarization in bulk MoS2 using spin angular momentum-shaped trefoil optical control pulses. These pulses transiently break time and space inversion symmetry through a simple phase rotation, inducing valley polarization.

3. The valley polarization is confirmed through the transient generation of the second harmonic of a non-collinear optical probe pulse, which depends on the trefoil phase rotation.

4. The findings show that direct optical control over the valley degree of freedom is not limited to monolayer structures but can be achieved in systems with an arbitrary number of layers and in bulk materials.

5. The non-resonant and ultrafast nature of this optical control method unlocks the possibility of engineering efficient multimaterial valleytronic devices operating on quantum coherent timescales.

### data_sheet
"The valley degree of freedom1,2,3,4 of electrons in materials promises routes towards energy-efficient information storage with enticing prospects for quantum information processing5,6,7."
"Our universal method utilizes spin angular momentum-shaped trefoil optical control pulses14,15 to switch the material's electronic topology and induce valley polarization by transiently breaking time and space inversion symmetry16 through a simple phase rotation."
"We confirm valley polarization through the transient generation of the second harmonic of a non-collinear optical probe pulse, depending on the trefoil phase rotation."

### quotes
"Non-resonant valley control is universal and, at optical speeds, unlocks the possibility of engineering efficient multimaterial valleytronic devices operating on quantum coherent timescales."

### further_questions
What other materials beyond MoS2 could potentially exhibit similar optical control over valley polarization, and what would be the key considerations in exploring such materials?
How could the transient breaking of time and space inversion symmetry through the trefoil optical pulses be further leveraged to control other electronic properties beyond just valley polarization?
What potential applications, beyond information storage and quantum information processing, could emerge from the ability to optically control the valley degree of freedom in materials at ultrafast timescales?
```

Optical control of valley polarization in bulk MoS2

achieving-optical-control-over-valley-polarization-in-bulk-molybdenum-disulfide-mos2-through-topological-optical-fields

note


"Non-resonant valley control is universal and, at optical speeds, unlocks the possibility of engineering efficient multimaterial valleytronic devices operating on quantum coherent timescales."


quotes


"The valley degree of freedom1,2,3,4 of electrons in materials promises routes towards energy-efficient information storage with enticing prospects for quantum information processing5,6,7."
"Our universal method utilizes spin angular momentum-shaped trefoil optical control pulses14,15 to switch the material's electronic topology and induce valley polarization by transiently breaking time and space inversion symmetry16 through a simple phase rotation."
"We confirm valley polarization through the transient generation of the second harmonic of a non-collinear optical probe pulse, depending on the trefoil phase rotation."


data_sheet


Achieving Optical Control over Valley Polarization in Bulk Molybdenum Disulfide (MoS2) through Topological Optical Fields


Achieving Optical Control over Valley Polarization in Bulk Molybdenum Disulfide (MoS2) through Topological Optical Fields

Valleytronics in bulk MoS2 with a topologic optical field - Nature

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